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Table of Content

    20 March 2020, Volume 56 Issue 2
    A Geo-Acoustic Sensing Probe for Seismic Monitoring
    HUANG Jipan, YONG Shanshan, WANG Xin’an, PANG Ruitao, ZENG Jingwu
    2020, 56(2):  193-198.  DOI: 10.13209/j.0479-8023.2020.005
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    In order to study whether the geo-acoustic signal can be used as a reliable earthquake precursor signal, a geo-acoustic sensing probe based on piezoelectric film is designed for seismic monitoring. The probe supports 0.1 Hz–7 kHz wide-band geo-acoustic signal acquisition, 19.073 μV voltage resolution, and amplitude consistency error less than 5.5% (0.47 dB). The probe passed 6 reliability tests including salt spray test, random vibration and package dropping, and applied to 178 stations including the Sichuan and Yunnan National Test Site for geoacoustic monitoring. Field observation experiments show that the stations around the epicenter can captured the underground geo-acoustic signals before and after the earthquake.
    Determination and Influence of Solid Angle in High Accuracy Analysis
    QIN Liqing, YAN Sha, ZHU Jipeng, GAO Yuan, XUE Jianming, WANG Yugang
    2020, 56(2):  199-205.  DOI: 10.13209/j.0479-8023.2020.009
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    In order to achieve high accuracy IBA (ion beam analysis), the calculation error of solid angle were discussed meticulously. The accuracies of face to point solid angle and approximate solid angle were calculated, based on face to face solid angle which contained area of beam spot. Based on 4.5 MV electrostatic accelerator ion beam target chamber of Peking University, solid angle influenced by distributions of cross-section and beam intensity was determined. A geometry-condition estimation for accuracy of approximate solid angle better than 1% was given and verified by two examples. For fatherly achievement of high-accuracy solid angle, accurate machining such as laser processing is required.
    Application of Similar Profile Method in Attenuation Correction of Single-Frequency Satellite-Borne Radar over Land
    GUO Tan, LIU Xiaoyang, ZHENG Zheng
    2020, 56(2):  206-214.  DOI: 10.13209/j.0479-8023.2019.118
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    In view of the difficulty in estimating the path-integrated attenuation (PIA) of rain attenuation over land using GPM-CO Ku data, we propose similar profile method. Using the radar profiles of rainfall over sea and the SRT-corrected radar profiles of rainfall, the profiles database is established with a certain precision to estimate the PIA over land by means of matching profiles over land with those in the database. Applications of the method to measurements for 2018 from the DPR of Ku band suggest that it performs well over the ocean. With 40% margin of error, the percentage of successful applications for convective rain is 88.8%, and it is 98.9% for both stratiform rain with and in the absence of a detectable bright band. In terms of rainfall from 2014 to 2018 over land, the result of using the similarity profile method is different from the rainfall over ocean, which is consistent with the poor performance of the SRT-corrected mothed over land.
    Experimental Research on the Characteristics of the Atmospheric Boundary Layer in the Semi-arid North China
    LI Qianhui, ZHANG Hongsheng, JU Tingting, XIAO Kaitao
    2020, 56(2):  215-222.  DOI: 10.13209/j.0479-8023.2019.125
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    A comprehensive experiment on semi-arid underlying surface was carried out at the comprehensive experimental station of atmospheric science and atmospheric environment in Horqin, Inner Mongolia during July 3th to 16th in 2016. Using high-precision GPS sounding data of the atmospheric boundary layer (ABL), the structure of the ABL in the semi-arid North China under different weather conditions (sunny, cloudy and rainy) was analyzed. The atmospheric boundary layer height (ABLH) was determined by different methods and criteria. In addition, the characteristics of low-level jets (LLJs), surface turbulent flux and surface energy budget were discussed. The results indicate that the average height of the ABL is 1790 m during the day while it is 250 m at night when sunny. In the cloudy day, the average ABLH is 980 m in daytime and 430 m at night. The turbulent kinetic energy in the surface layer shows a strong correlation with ABLH at night. LLJs mostly occur at midnight, with an average altitude of approximately 390 m, and there is a positive correlation between the intensity and the altitude of LLJs.
    Estimating the Daily Atmospheric Maximum Mixing Height with 1-Second Sounding Data over Beijing Area
    WANG Yuehao, LI Chengcai, CHU Yiqi, TAN Wangshu, REN Jingjing
    2020, 56(2):  223-230.  DOI: 10.13209/j.0479-8023.2019.129
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    Basing on the 1-second sounding data from L-band radar and the daily max potential surface air temperature over Beijing, the possibility of deriving the daily maximum mixing layer height (MMH) over Beijing region by the parcel method was studied. By comparing the inversion results of the 1-second sounding data and the conventional sounding data at local time 08:00 with the inversion results from a micro pulse lidar (MPL), it is found that the consistency between the former and the MPL results is better than the latter. The reason for the larger bias from the conventional data results may be due to their lower vertical resolution. By comparing the inversion results of the 1-second sounding data in spring, summer, autumn and winter respectively with the results from the MPL, it is found that the consistency is better in spring, summer and autumn, but it is worse in winter. Long-term data results of the MMH over Beijing area from 2010 to 2017 were obtained using the 1-second sounding data at local time 08:00 and the daily maximum potential surface air temperature. It is found that the MMH almost showed a decreasing characteristic from spring to summer, to autumn and to winter successively. With the long-term results, it is found that the thermal stability defined by the difference of the daily max surface air temperature and temperature at the layer of 850 hPa was strongly positively correlated with the MMH in Beijing area.
    Retrieval of Surface Visibility Using Satellite-Based Aerosol Measurements
    ZHANG Yan, LI Jing
    2020, 56(2):  231-241.  DOI: 10.13209/j.0479-8023.2019.124
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    In order to obtain the large scale spatial distribution of surface visibility, a novel technique is developed to convert satellite-retrieved aerosol optical depth (AOD) to surface visibility through aerosol scale height. Specifically, the aerosol scale height is calculated using the advanced optimal interpolation (OI) method by assimilating CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) measurements into GEOS-Chem stimulation results. The assimilated analysis field is then combined with MODIS AOD to calculate surface visibility. Validation against ground observation in China shows that best monthly correlation between collocated satellite-retrieved visibility and surface visibility data is above 0.5. Reasonable agreement is also found in seasonal and spatial variability.
    Mineralogical Characteristics of Aphanitic Cryptocrystalline in Yantongshan and Its Significance for Origin
    CHENG Siyu, CHUAN Xiuyun, YANG Yang, LIN Chao, CHEN Siyu
    2020, 56(2):  242-252.  DOI: 10.13209/j.0479-8023.2019.126
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    By means of optical microscope, field emission scanning electron microscope, X-ray diffraction and laser Raman spectroscopy, the mineralogical characteristics of cryptocrystalline graphite in Yantongshan, Jilin Province and its indication significance for the genesis of the deposit are studied. The diameter of graphite microcrystals is La=59?175 nm, and the stacking height is Lc=32?93 nm. The graphitization degree value ranges from 0.573 to 1.000, and the interval (002) layers vary from 0.3352 to 0.3370 nm. The intensity ratio of D1 peak and G peak arranges between 0.07 to 0.28. On the base above, the metamorphic temperature range was calculated as 526℃ to 622℃, with the average is 561℃, indicating that the metamorphic degree could reach the amphibolite facies in its formation. The graphitization degree varied greatly, and much higher near Fe bearing minerals, indicating that the crystallization process of graphite could be catalyzed with the different spots of one graphite ore slice by Fe containing compounds.
    Sensitivity Evaluation and Influencing Factors Analysis of Tight Sandstone Reservoirs: A Case Study of the Chang-8 Reservoir in Yanchi Area of Ordos Basin
    CHAI Guangsheng, SHI Yongmin, DU Shuheng, WEI Yun, ZHANG Zhiqiang, GUO Chun’an, SUN Tong
    2020, 56(2):  253-261.  DOI: 10.13209/j.0479-8023.2019.121
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    Taking the Chang-8 reservoir in Yanchi area of Ordos Basin as an example, combined with thin slice identification, X-ray diffraction, high pressure mercury intrusion and core fluid flooding test, the reservoir sensitivity is quantitatively evaluated and its influencing factors are deeply analyzed. The results show that the sensitivity of the Chang-8 tight sandstone reservoir in Yanchi area of Ordos Basin is mainly characterized by moderately strong water sensitivity, weak-medium weak acid sensitivity, weak-moderate weak alkali sensitivity, and weak salt sensitivity. Reservoir sensitivity are mainly affected by clay mineral composition, rock mineralogical characteristics, pore structure and physical properties. The content and composition of clay minerals are the main factors, which should be highly valued in actual development. The research conclusions will provide important scientific support for enhanced oil recovery in the middle and late stages of the development of tight sandstone reservoirs.
    Identification and Prediction of “Sweet Spots” in Tight Sandstone Reservoirs Based on Logging Curve Dimensionless Rendezvous Method
    GUO Chun’an, GUAN Ping, SHI Yongmin, DU Shuheng
    2020, 56(2):  262-270.  DOI: 10.13209/j.0479-8023.2020.002
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    Based on the principle that natural gamma and acoustic time difference curves have nice logging response in tight sandstone reservoirs, three methods named experience trial and error, the degeneralization method based on the non-homogeneousnature of the reservoir and sonic porosity method were adopted to transform the natural gamma and acoustic time difference curves in an oilfield area of Ordos Basin into new curves to propose a logging curve dimensionless rendezvous method, and two kinds of “sweet spots” indexes named heterogeneity evaluation index (HEI) and porosity-permeability comprehensive evaluation index (PPI) were constructed to evaluate the tight sandstone reservoirs quantitatively. A new means was explored to identify the “sweet spots” of tight sandstone reservoirs by using dimensionless rendezvous method and “sweet spots” indexes to carry out reservoir classification, evaluation and “sweet spots” prediction in the study area. The conclusions of this research are in good agreement with the measured data in the mine, which will provide an important theoretical and practical basis for the prediction of “sweet spots” in the tight sandstone reservoirs.
    Experimental Study of The Ultrasonic Velocity of Methane Hydrate-Bearing Unconsolidated Sediments
    YANG Zhiqiang, HE Tao, ZHU He, LAN Kun, LU Hailong
    2020, 56(2):  271-282.  DOI: 10.13209/j.0479-8023.2019.119
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    It is the scientific basis for seismic exploration and resource evaluation of natural gas hydrate to study the acoustic properties of gas hydrate-bearing unconsolidated sediments in the laboratory. For this purpose, an instrument was designed to experimentally study the change in acoustic velocity of water saturated unconsolidated sediments during gas hydrate formation. The improved ultrasonic transducer was employed to measure the acoustic velocity. The saturation of methane hydrate was continuously monitored as referring to the gas pressure change in the reactor, which was then related to the corresponding acoustic measurement. With the artificial sample simulating the sediments of core HY-3 from SH-7 borehole in Shenhu area of South China Sea, several round experiments of methane hydrate formation and dissociation were conducted. The results showed that the measured compressional and shear wave velocities were located between the curves predicted as to the rock physics models with and without hydrate cementing sediment grains in pore space. Although methane hydrate preferred to suspend in pore space or precipitate on sediment grains in dissociation and formation processes, there was always a very small amount of hydrate cementing the grains, and it significantly increased the acoustic velocities of sediments.
    Spatial Distribution of Earthquakes and Crustal Seismic Velocity in Shanxi Rift Zone
    WANG Yu, LI Zihong, NING Jieyuan
    2020, 56(2):  283-290.  DOI: 10.13209/j.0479-8023.2020.001
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    To study the seismic activity and physical background of Shanxi rift zone, we use tomoDD to relocate earthquakes recorded by China network from 1990 to 2008 and the data recorded by a local network run by Shanxi Earthquake Bureau from 2012 to 2016, and show three-dimensional seismic velocity structure in Shanxi rift zone. The events are concentrated around the known faults in the Shanxi rift zone, mainly on the NE and SW sides of the Taiyuan Basin. Most of the focal depths are shallower than 30 kilometers. The earthquakes in the northern part of the research area are shallow while the earthquakes deeper than 20 kilometers are mainly located to the south of the Xinding Basin. Among them, the two densely distributed seismic zones on the NE and SW sides of the Taiyuan Basin with strikes pointing NS directions form sub-vertical distributed seismic zones, which may be controlled by two strike-slip deep fracture zones. If the Taiyuan Basin is broken and the two strike-slip faults are connected, there might be strong earthquakes with magnitude 7 or higher. The results show that the velocity in Shanxi Rift Zone varies intensely. The velocity in the crust of Shanxi Rift Zone is generally low, but the velocity in the crust of the Taiyuan Basin is not the lowest when the velocity in the crust of its NE and SW is especially low. In contrast, to the NW and SE of the Taiyuan Basin as well as the west of Datong the velocity in the crust is high. These correspond well with geological features on the surface and the heat flow observations. The results show that there might be thermal materials upwelling beneath the Shanxi Rift zones to NE and SW of the Taiyuan Basin and the hot materials might invade into the interior of the Ordos block. On the contrary, the hot materials most probably do not invade into the crust of the Taiyuan Basin, as well as its NW and SE surrounding areas. We deduce that the extension of the Taiyuan Basin might not be controlled by the upwelling of hot materials but be controlled by horizontal extensional force produced by the push of the Tibettan Plateau.
    Upper Crust Anisotropy Parameters in Dali-Yongping to the West of Red River Fault
    JIANG Jiaxiang
    2020, 56(2):  291-306.  DOI: 10.13209/j.0479-8023.2020.004
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    This paper studied the shear-wave splitting of 5 portable stations in Dali-Yongping to the west of Red River fault which was set up under the project China Array Phase I from 2011 to 2013, obtaining 18, 14, 7, 9 and 5 shear-wave splitting results for these 5 portable stations, respectively. Applying “Over-Normalization” correction method with more precise shear wave path, 3 anisotropic layers with different anisotropic strength are found above 10 km depth in the upper crust. The second anisotropic layer’s anisotropy is weakest with thickness of 2?2.4 km. The first anisotropic layer’s anisotropy is stronger with thickness of 4.1?5.0 km. The third anisotropic layer’s anisotropy is strongest. This multilayered anisotropy characteristic is coincide with the magnetotellurics results in this area. Combining low velocity anomaly, low resistivity and low Q value in western Yunnan, the strongest anisotropy in the third anisotropic layer is caused by rich cracks and upward transferring heat flow which is created by the upwelling of mantle material.
    Research on Accessibility of Medical Treatment Based on Grading Treatment: A Case Study of Weifang City Center Area
    NIE Yifei, FENG Changchun
    2020, 56(2):  307-314.  DOI: 10.13209/j.0479-8023.2020.008
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    Based on GIS technology, the improved two step floating catchment area method is applied to study the accessibility of medical treatment in the Weifang city center area and assess the impact of graded diagnosis and treatment on the accessibility of residents with the community as the basic unit. The conclusion is that the accessibility of medical treatment in the downtown area of Weifang is multi-centered, and the accessibility of communities distributed in center, northeast and east part of the city is relatively high, and those at the edge of the central urban area is low. The medical accessibility is improved under graded diagnosis with different referral rates, However, because the second and third-level hospitals are concentrated in the central and northeastern regions, graded diagnosis and treatment will also aggravate the differences in accessibility between communities, which makes it difficult to maintain fairness. Therefore the layout of medical facilities should be improved by guiding medical resources to the fringe areas of the central city, and locating primary medical facilities in the center of the community to improve the convenience of residents.
    Spatial Differentiation Pattern and Influence Factor Detection of County-Level Grain Production in Huang-Huai-Hai Region
    LIU Yu, REN Yanmin, PAN Yuchun
    2020, 56(2):  315-323.  DOI: 10.13209/j.0479-8023.2019.130
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    Spatial aggregation features of 2015 county-level grain yields of Huang-Huai-Hai Region have been analyzed systematically based on cumulative distribution function and spatial autocorrelation analysis method, and impact of 18 factors on grain yields of different categories of counties in Huang-Huai-Hai Region and their interaction have been analyzed by use of geographical detector. The results indicate that low county-level grain yields in Huang-Huai-Hai Region tend to aggregate and high county-level grain yields tend to scatter, showing significant homogeneous aggregation in space. The areas of significant high yields are mainly distributed in southeast Henan Province, north Anhui Province and north Jiangsu Province and areas of significantly low yields are mainly in Beijing-Tianjin-Hebei Region and coastal counties of Shandong Province. In consideration of spatial constraints and distribution difference of grain yields, Huang-Huai-Hai Region can be classified into 4 areas: high grain yield area, mid-high grain yield area, low-middle grain yield area and low grain yield area. The impacts of 18 factors on county-level grain yields of Huang-Huai-Hai Region vary and mainly manifest dual-factor enhancement type and nonlinear enhancement type. The leading factors of high yield area are added value of primary industry, consumption of fertilizers (total mass percent of nutrients) and total agricultural mechanical power, belonging to social economy and factor-input acting type. The leading factors of mid-high yield area are cultivated land area, regional registered population, added value of primary industry, gross agricultural mechanical power, showing as the combined acting type. The leading factors of low-middle yield area are cultivated land area and consumption of fertilizers (total mass percent of nutrients), showing as geographical environment and factor-input acting type. The leading factors of low yield area are vegetation index, cultivated land area, added value of primary industry, consumption of fertilizers (total mass percentage of nutrients) and total agricultural mechanical power, showing as a combined acting type. The targeted grain production and income increase strategy shall be formulated in the future based on actual conditions of different areas.
    Lake Area Changes in Jing-Jin-Ji Region in Recent 30 Years
    ZHANG Heng, TAO Shengli, TANG Zhiyao, FANG Jingyun
    2020, 56(2):  324-330.  DOI: 10.13209/j.0479-8023.2019.123
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    By using remote sensing data, climatic data and socio-economic data, this study revealed that the lake area of Jing-Jin-Ji region tended to an overall decrease between 1987 and 2017 (approximately 2% per year) due to effects of both natural and human factors. The 30-year lake area change could be divided into three periods: in 1987–1996, it increased (about 4.8×102 km2, 76%) as a consequence of climate changes (R2=0.849, p=0.001); during 1997–2009, it decreased (about 4.7×102 km2, 43%) because of intense human impacts (R2=0.536, p=0.013); and in the recent eight years (2010–2017), it increased again (about 2.3×102 km2, 36%) due to human regulations. Although the severe lake decreasing trend of the study region has been reversed in recent eight years, the contradiction between supply and demand of surface water is still remarkable.
    Study of Partial Nitritation and Annmmox Process Treating Mainstream Municipal Wastewater with SASMBR
    LI Jianqi, YU Daodao, LÜ Yufeng, LIU Sitong
    2020, 56(2):  331-340.  DOI: 10.13209/j.0479-8023.2020.010
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    Based on the reactor unstable and low nitrogen removal rate when Partial Nitritation and Anammox (PN/A) process treat municipal wastewater, a new composite bioreactor named sequencing batch-baffled-separate membrane bioreactor (SASMBR) was designed and manufactured. This reactor was applied to the treating of municipal wastewater using PN/A process to explore the performance and analyze the operating costs of the reactor. The results showed that highly efficient and stable denitrification processes had been achieved using PN/A process in this reactor, with TN removal rate up to 80%–85%, nitrogen removal rate (NRR) up to 0.20–0.22 kgN/(m3·d) and the effluent TN concentration was below 8 mg/L. 16SrRNA gene sequencing analysis found that the baffles set inside the bioreactor could enrich ammonia oxidation bacteria (AOB), which ensuring a good treating performance of the reactor. Non-woven fabrics in the SASMBR could effectively retain anaerobic ammonium oxidizing bacteria (AnAOB), and the increasing abundance of AOB in the SASMBR could provide anaerobic environment and NO2--N substrate for the growth of AnAOB. As such, the combination inevitably accelerated the quick startup of the reactor and maintained its highly efficient and stable running. The operating costs was 0.307 yuan/m3 which was significantly lower than the traditional municipal wastewater treatment plants.
    Impact of Land Use on Ecosystem Productivity in Karst Faulted Basin
    SHI Chenlu, WU Xiuqin
    2020, 56(2):  341-351.  DOI: 10.13209/j.0479-8023.2019.079
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    In order to objectively evaluate the impact of land use on the ecological environment in faulted basins, and reflect the complex relationship between people and land at a deeper level from changes in ecosystem services, based on multi-time series land use data and terrestrial vegetation net productivity (NPP) in faulted basins, the temporal and spatial variation characteristics of NPP in faulted basins are clarified, and the characteristics of landlevel changes in land use change intensity over many years is revealed. The life cycle assessment method is used to quantitatively analyze the impact of land occupation and land conversion on the net productivity of terrestrial vegetation in rocky desertification areas, and explores the ecological benefits of rocky desertification control. The results show that 1) the change of net primary productivity (NPP) in most areas of the study area was not significant between 2000 and 2015, NPP showed significant changes in a small part of the region with an upward trend as the main trend; 2) among the six land types, the change of forest land is stable, the growth trend of construction land is active and strong, and the grassland reduction trend is active and strong; 3) the difference between the potential vegetation productivity of forest land and the existing NPP gradually increases from west to east, and has a consistent spatial distribution with the reduction of forest land occupation, indicating that forest land distribution will affect the net productivity of forest land vegetation; and 4) the natural vegetation growth in the northern part of the study area is good. The forest vegetation in the rocky desertification areas of Liupanshui City, Pu’an County and Luliang County in the eastern region has a certain degree of natural degradation, and the ecological restoration effect of forest land is general; 5) 80% of land conversion types in the research area makes NPP gain. The common way to makes NPP significantly improved is to convert grassland and cultivated land into forest land; the conversion of forest land to construction land causes the most damage to NPP.
    Environmental Regulation, Path Dependence and Distribution of Water Pollution Industries: An Empirical Analysis Based on the Yangtze River Basin
    TIAN Xin, CHEN Shuai, XU Jintao
    2020, 56(2):  352-364.  DOI: 10.13209/j.0479-8023.2019.131
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    Based on the data of the Annual Census of Enterprises and relevant socio-economic information, this article empirically investigates the impacts of environmental regulation and path dependence on the distribution of water pollution industries in the Yangtze River basin. The article analyses the path dependence effect through HHI and location entropy. In the empirical model, the two-stage least squares method is used to solve the endogeneity of environmental regulation indicators, which improves the reliability of the conclusions. The results show that the concentration of water pollution industries discharging COD in the Yangtze River is relatively low and dispersed, and the concentration of this industry declines significantly year by year during the period of Eleventh Five-Year Plan. During the period of Tenth Five-Year Plan, the path-dependent effect of water pollution industries discharging COD is significant, while environmental regulation has no significant impact on their distribution. During the period of Eleventh Five-Year Plan, the path dependence no longer has significant impact, and environmental regulation significantly reduces the output and growth rate of the industry. For non-COD water pollution industries and non-water pollution industries, environmental regulation has no significant impact on them. From the perspectives of enterprise ownership types, collective enterprises, private enterprises and foreignfunded enterprises are significantly affected during the Eleventh Five-Year Plan period, while state-owned enterprises and HMT enterprises are not significantly affected. Generally speaking, with the impact of path dependence and environmental regulation on the distribution of water pollution industries shifting from one to another, and with the impact of environmental regulation on the distribution of water pollution industries increasing, continuing to improve environmental regulation polices will contribute to the sustainable development of the Yangtze River basin.
    Study on Farmers’ Satisfaction with Land Consolidation Performance from the Perspective of Livelihood Capital: A Case Study of Ranyi Town, Sichuan Province
    CHEN Tianqian, FENG Zhe, CUI Yongliang, ZHAO Huafu
    2020, 56(2):  365-372.  DOI: 10.13209/j.0479-8023.2020.007
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    In order to evaluate the satisfaction of land consolidation performance, Ranyi Town in Qionglai City, Sichuan Province was selected as the study area, and the data were obtained through questionnaires and interviews. According to the occupation, the farmers were divided into four types: pure agriculture, agriculturebased, non-agricultural-based and non-agricultural. The livelihood capital estimation table was constructed from five aspects: human capital, natural capital, physical capital, financial capital and social capital to evaluate the current status of the livelihood capital of farmers with different livelihood types in the land consolidation area. Based on the calculation results, the impact of land consolidation on farmer satisfaction was investigated, and the Probit model was used to analyze the influencing factors of satisfaction. The results show that the farmer’s livelihood capital is slightly out of balance, the social capital and material capital value are higher, and the financial capital and human capital value are lower. Farmers generally have higher satisfaction with land consolidation projects. Factors such as natural capital, physical capital, social capital, and income sources have a positive impact on satisfaction; education, financial capital, and livelihood activities have a negative impact on non-agricultural farmers’ satisfaction.
    Reviews and Prospects for Forest Transition
    LU Longhui, XU Yueqing, HUANG An, HUANG Ling, LIU Chao, WANG Hui
    2020, 56(2):  373-384.  DOI: 10.13209/j.0479-8023.2020.003
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    In order to support the scientific forest conservation policy and sustainable development, through collecting and analyzing the domestic and foreign academic literature about “Forest Transition”, this paper summarized the concept, connotation, theories, research framework, methods and impact factors, put forward the future research focus and prospect of “Forest Transition”, and proposed an integrated theoretical framework of “Forest Transition”, The main conclusions are as follows. 1) The concept of “Forest Transition” refers to the reversal trend of forest area from reduction to increase, which is the result of the mutual adaptation of socialeconomic-environment system. “Forest Transition” is the comprehensive reflection of land use. The main core issue of “Forest Transition” research is the driving factors and internal mechanism of reversal trend. 2) “Forest Transition” has the characteristics of particularity, occasionality and concurrency. It has the characteristics of nonlinear dynamics, obvious turning point and multi-dimension. 3) “Forest Transition” has many paths (economic development path, forest scarcity path, globalization path, national forest policy path, intensive of peasant land use path). At present, the mechanism of “Forest Transition” is mainly explained by relative rent of forest-land use, land quality adjustment and social-ecological feedbacks. 4) Currently, the achievements about “Forest Transition” are plentiful but still need to integrate multi-source data and methods in accordance with a more comprehensive theoretical research framework of overall analysis, follow the research line of “concept-process-mechanism-effectapplication”, focus on systematic scale synthesis and heterogeneity, expand the scope of case studies, deepen interdisciplinary research, and strengthen policy application.