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Water Conservation Function of Mountainous City in Western Yunnan: A Case Study of Baoshan City
CHEN Wenhua, XU Juan, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2021, 57 (6): 1153-1160.   DOI: 10.13209/j.0479-8023.2021.087
Abstract657)   HTML    PDF(pc) (556KB)(147)       Save
Taking Baoshan City of Yunnan Province as an example, the spatial distribution of regional water conservation function was evaluated based on Budyko water balance model using the global monthly precipitation, temperature data (900 m resolution), MOD17A3 NPP data and HWSD-v1.2 soil data. The results show that the spatial distribution of water conservation is mainly affected by the uneven spatial distribution of precipitation, and the barrier of Gaoligong Mountain plays an important role in water vapor distribution. The unit water conservation and total water conservation of different land types are forest > shrub grassland > cultivated land > water area > construction land. It is very important to enhance the ability of forest conservation. The most important area of water conservation in the study area accounts for 14% of the total area and is concentrated in the west side of Gaoligong Mountain. The water conservation capacity of most areas in the east side is relatively low, which exerts much stress on water conservation.
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Quantitative Assessment on Supply-Demand Budget of Culture Ecosystem Service: A Case Study in Pinglu Swan Scenic Spot
YANG Liwen, WANG Dayong, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2021, 57 (4): 691-698.   DOI: 10.13209/j.0479-8023.2021.040
Abstract783)   HTML    PDF(pc) (1122KB)(323)       Save
Taking Pinglu Swan Scenic Spot as an example, the supply-demand relationship of cultural ecosystem service (CES) was assessed. The supply of CES was rated by the annual capacity of tourist reception, and the demand was calculated through importance value acquired by questionnaire. The results were showed as follows. 1) The overall demand of CES was positively correlated with GDP per square kilometre and population density, meanwhile it was also related to the understanding of CES. However, it had no relevance to distance. Owing to continuous loss of biodiversity from global climate change and human activities, the demand for bird-watching service, aesthetic value and existence value were relatively high, which suggested that people attached much importance to the biodiversity conservation. 2) The supply capacity of CES of Pinglu Swan Scenic Spot was generally higher than the overall demand, so the demand was the chief factor that affected the supply-demand relationship. The supply-demand matched areas were distributed in Xi’an City and Zhengzhou City, while the other 13 cities demonstrated a mismatched relationship. Enhancing the propoganda and education, as well as improving traffic service of Pinglu Swan Scenic Spot will raise demand so as to narrow disparities between supply and demand of CES. The results provide data support for environmental planning and management of wetland resources. 
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Basic Supply Service Model of Beijing-Tianjin-Hebei Region Based on LUCC-ESs Matrix
LI Xiaojing, GAO Yang, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2020, 56 (5): 950-958.   DOI: 10.13209/j.0479-8023.2020.064
Abstract783)   HTML    PDF(pc) (2252KB)(125)       Save
As the traditional ecosystem service evaluation methods have the disadvantageous as high subjectivity and low comparability, a LUCC-ESs matrix evaluation method is improved. Based on the land use/cover types, the proposed method calculates the ecosystem service units, then builds the LUCC-ESs matrix to evaluate the ecosystem services. This method can avoid different outcomes obtained by different calculation methods, and make these test results comparable and practical. The application of the basic supply service in the Beijing-Tianjin-Hebei region indicates that the spatial pattern of the basic supply services is regional and highly connected with resource reserves and land productivities. The spatial pattern of the demand service appears the same movement and aggregation characteristics as that of the population, which decreases from the city center to suburban. The basic services both inside and outside Beijing-Tianjin-Hebei region converge to the urban center. 
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A Study on the Characteristics of Hydrological and Meteorological Droughts in the Lower Nu River
CHEN Wenhua, XU Juan, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2019, 55 (4): 764-772.   DOI: 10.13209/j.0479-8023.2019.034
Abstract790)   HTML    PDF(pc) (1559KB)(294)       Save
Taken Mengboluo River, the major tributary in the lower reaches of Nu River as a case, the standard precipitation index (SPI), the standardized precipitation evapotranspiration index (SPEI) and the runoff drought index (SDI) were employed to analyse the change processes of meteorological and hydrological drought based on the monthly precipitation and temperature data of the surrounding meteorological stations from 1966 to 2013, and the monthly runoff of the outlet of the river. The drought indexes value in three reference periods (12 months, 6 months and 3 months) were calculated for each indexes, and the correlation between meteorological and hydrological drought in the basin were also analysed. The results show that there were increasing drought trend, especially, that represented by SPEI-6M and SPEI-3M since 2000s; the drought occurred with multi-scale periodic characteristics. After the mid-90s, the large-scale 25–30 years periodicity gradually moved down to the 10–15 years periodicity. After 2000s, the runoff drought has changed into a weakened drought period over 25 years; but on the mesoscale periodicity with 10–15 years, it is in a transition period from drought to semi humid. Runoff drought is closely related to meteorological drought. Meteorological drought index SPEI-6M could be used to predict annual runoff drought
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Transmission Mediums Based Ecosystem Services Classification System
WU Shuyao, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2018, 54 (5): 1133-1136.   DOI: 10.13209/j.0479-8023.2018.041
Abstract774)   HTML    PDF(pc) (372KB)(228)       Save

After reviewing some current common ecosystem service classification systems, it is found that current classification systems were not able to reflect the fact of different ecosystem types often produce different services due to their unique components, structures and environments. The authors used ecosystem components to create a new ecosystem service classification system based on transmission medium. Ecosystem services are classified into water-transmitted, rock and soil-transmitted, air-transmitted, organism-transmitted and whole ecosystemtransmitted services. Some water-transmitted services include water yield, water purifying, water regulation etc.; rock and soil-transmitted services include soil retention, soil formation, geologic hazard prevention etc.; airtransmitted services include carbon sequestration, air purifying, climate regulation etc.; organism-transmitted services include food production, pollination, pest bio-control etc.; last but not least, whole ecosystem-transmitted services include aesthetic information, recreation, education etc. The proposed classification system may help differentiating services provided by different ecosystem types and identifying some common services provided by the same ecosystem type.

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Simulation of Temporal and Special Land Use Changes in Jing-Jin-Ji Urban Agglomeration Using CLUE-S Model
ZHANG Jin, ZHU Wenbo, WU Shuyao, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2018, 54 (1): 115-124.   DOI: 10.13209/j.0479-8023.2017.137
Abstract985)   HTML11)    PDF(pc) (9653KB)(312)       Save

For the land use demands of Jing-Jin-Ji urban agglomeration cooperative development strategies, four kinds of land use policies, i.e. status quo continuation, food security, nature protection and urban expansion were made. A modified Cobb-Douglas utility function was developed to quantify the influence of different policies on various land use demands, and a CLUE-S model was built to simulate the spatial and temporal evolution of Jing-Jin-Ji land use under different policies. Results show that, compared with year 2010, great changes occur on land use areas and patterns in the year 2020 under different policies. “Status quo continuation” is characterized by the continuous expansion of urban groups, increasing the construction land by 2280 km2. “Food Security” significantly increases the arable land by 3611.4 km2, while reducing the ecological land including forest and grassland. “Nature protection” greatly reduces the area of arable land by 3082.13 km2, while increasing forest, grassland and water area by 3726.4 km2. “Urban expansion” substantially increases the construction land by 3375 km2, while decreasing other types of land use. Spatially, every land use policy has its significant regional characteristics in land use conversion. The increase of construction land always comes together with the decrease of arable land, which tends to occur in the existing urban surroundings. The increase of ecological land is more often seen in Bashang plateau, Yanshan Mountains as well as Taihang Mountains. This study has great reference value in designing optimal land use policies, especially in the gradual implementation stage of the Jing-Jin-Ji collaborative development strategies.

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Modelling Relationship between NDVI and Climatic Factors in China Using Geographically Weighted Regression
HAN Ya, ZHU Wenbo, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2016, 52 (6): 1125-1133.   DOI: 10.13209/j.0479-8023.2015.130
Abstract925)   HTML    PDF(pc) (1569KB)(1406)       Save

Based on the GWR (geographically weighted regression) model supported by ArcGIS, the research explores the multi-scale relationship between vegetation change, climatic factors, and the sensitivity of vegetation to climate factors using AVHRR vegetation cover data combined with temperature and precipitation data in China from 1982–2010. Compared with the general linear regression (Ordinary Least Square, OLS) model, GWR gives a much better fitting result, with the goodness of fit increased from 0.3 to 0.6. The relationship between NDVI, annual rainfall, and average annual temperature has a significant spatial heterogeneity. Regression coefficients of climatic factors decrease from north to south and are higher in the northwest dry region of China. Temperature is more influential than rainfall on NDVI in most areas of China. Each ecological zone has different spatial scales when NDVI and the climatic factors maintain a stable relationship.

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Ecosystem Service Valuation and Value Transfer of Land Use Types: A Comprehensive Meta-analysis of the Literature
ZHANG Yaxin, LIU Ya, ZHU Wenbo, LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2016, 52 (3): 493-504.   DOI: 10.13209/j.0479-8023.2016.026
Abstract1291)   HTML    PDF(pc) (1009KB)(994)       Save

Based on Meta-analysis, the ecosystem service value regression models for cultivated land, forest land, pasture, garden land, waters and unused land were established respectively. In addition to time and value method, the geographical division and socio-economic factors (including population density and GDP per capita) were also incorporated into the models. The performance of model indicates that these factors play a significant role in explaining ecosystem service value change. Using value transfer approach, the authors valued ecosystem service of land use types in Beijing, Tianjin, and 11 cities in Hebei Province. The results show that land use types ranked by ecosystem service value are waters, forest land, pasture, garden land, cultivated land and unused land. The ecosystem service values per unit area of cultivated land, forest land, pasture, garden land and water area in Beijing and Tianjin are more than other areas. The research results on the one hand can enrich the methodology and technology of ecosystem service valuation, on the other hand provide scientific support for land use sustainable management in study area.

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Research Progress in Culture Ecosystem Services (CES) and Its Development Trend
DONG Liangeng,ZHU Wenbo,GAO Yang,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract1533)      PDF(pc) (486KB)(885)       Save
The scale, evaluation index, method, the application in management and decision-making are reviewed through the published achievement of cultural ecosystem services (CES), and the research tendency is predicted. Perfecting the research framework, promoting the development of participatory mapping and strengthening the interaction between services are considered the most important topics in the future.
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Prediction and Zoning Evaluation of Urban Sprawl in Shenzhen
ZHANG Jin,LI Shuangcheng,WANG Yang
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract657)      PDF(pc) (1999KB)(637)       Save
Taking Shenzhen, Guangdong Province, China as an example, CLUE-S model was used to simulate its urban sprawl in 2020. An evaluation system was established based on indicators from speed, strength, morphology, social economic benefits and ecological benefits of urban sprawl. By using SOFM network, the authors zoned the region and evaluated the urban sprawl for each zone. Main conclusions include that 1) Shenzhen can be divided into four regions according to future (2020) urban sprawl, i.e. the highly urbanized zone, the developing zone, the potential zone and the ecology priority zone, and therefore reasonable adjustments of development strategy need to be made; 2) by 2020, the overall quality of urban sprawl in Shenzhen will be high according to current trend, however, problems such as the low efficiency of land use and the incoordination of social-economic and ecological benefits still exist; 3) based on CLUE-S and SOFM, combined with urban sprawl comprehensive evaluation index system, the future urban sprawl can be predicted and analyzed effectively.
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Assessing the Vulnerability of Ecosystem Services of Beijing-Tianjin-Hebei Area Based on Radial Basis Function Network
LIU Jinlong,MA Cheng,WANG Yang,FENG Zhe,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract604)      PDF(pc) (2038KB)(550)       Save
The authors put forward the concept of vulnerability of ecosystem services, and carries a case study in Beijing-Tianjin-Hebei Area. The changes of ecosystem services were calculated from 2001 to 2009 in this region, and radial basis function network was used to assess the potential impacts of ecosystem services to land use change and the adaptive capacity of human-beings based on the 9 training data chosen from 164 counties. The results show that the average ecosystem services value of study area has declined 184.36 yuan/ha from 2001 to 2009, and the positive potential impacts of ecosystem services to future land use change declines from southeast to northwest, and the middle shows the least; the districts near big cities such as Beijing, Tianjin and Tangshan have the best adaptive capacity, which has a positive correlation with GDP; and by integrating potential impacts and adaptive capacity, the study gives the spatial pattern of the vulnerability of ecosystem services: the districts near Bohai Sea turn out to be the least vulnerable; the plain in the southeast and mountains in the northwest are worse; and the districts near Taihang Mountains in the west are the most vulnerable. Of all the residents living in this region, 92.4% range between 2 to 4 in the classification of vulnerability.
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Comprehensive Clustering Analysis of Climatic Change Risk Sources in Qinghai-Tibet Plateau
LI Shuang,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Scale Sensitive Analysis of Cellular Automata Model
WANG Yang,GAO Yang,ZHAO Lin,ZHAO Zhiqiang,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract800)            Save
The authors present an analysis of how scale issues affect a cellular automata model of land use change developed for a research area in Longhua Town, Shenzhen City. The scale dependence of the model is explored by varying the resolution of the input data in 1990 used to calibrate the model and changing the length of model simulating time. To explore the impact of these scale relationships the model is run with input datasets constructed at the following spatial resolutions: 30, 60, 90, 120, 150, 180, 210 and 240 m for simulating land use in 1995 and 2000. Three kinds of indicator, i.e. point by point accuracy, Kappa and real change accuracy are used to assess the scale sensitivity of the model. The results show that 1) the more fine the cell sizes are, the higher the accuracy of the simulation results; 2) path dependence of the isolated cells is an important source of the spatial scale sensitivity of CA model; 3) the specific geographical process in different periods of time is an important source of the temporal sensitivity scale of CA model. The results have great significance for the scale selection of CA model.
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Temporal Variation of Virtual Water of Selected Agricultural Products in Northeastern China
HUANG Jiao,GAO Yang,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract843)            Save
The authors investigated the temporal and spatial patterns of the virtual water content (/kg) and total virtual water requirements for rice, wheat, maize and soybeans in Liaoning Province, Jilin Province and Heilongjiang Province in Northeastern China from 1988 to 2008. The results show that soybeans had the highest water demand per kilogram, followed by wheat, rice and maize. Spatial variations were evident. Per kilogram rice consumes more water in Heilongjiang, while wheat in Jilin, maize and soybeans in Liaoning. In Heilongjiang, rice, wheat and soybeans had the highest total virtual water needs, 8.60×109, 3.98×109 and 1.22×1010m3, respectively. Whereas the largest total virtual water for maize (1.08×1010m3) appeared in Jilin Province. During the studied period, water demands per kilogram of soybeans and wheat fluctuated, while for rice and maize the demands were stable. As to total virtual water demand, it increased for maize and rice, whereas decreased significantly for wheat. These findings provide insights on the water demand of the four crops, and thus are meaningful for decision-makers.
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SOFM-Based Classification for Land Price of City in China
GAO Yang,ZHAO Ruina,A Shan,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract697)            Save
Cities at prefectural level(area cities) are not only high-speed economic developing areas, but also the key areas of land supply, reorganization and active transaction. Five variables such as area of land transfer, average land prices, GDP, growth rate of GDP, and fixed assets investment are used to develop a self-organizing feature map(SOFM) artificial neural network model. The results show that 282 area cities in China are divided into the four categories: developed area of high land prices, developed area of low land prices, underdeveloped area of high land prices, underdeveloped areas of low land prices. According to the results, the characteristics of each region are analyzed and the current development situation is discussed. Classification results match the objective reality very well, indicating SOFM-based classification method is an alternative approach in research of socio-economic development.
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Accounting and Analyzing Eco-economic SystemUsing a Modified Emergy-Based Ecological Footprint Model : A Case Studyin Guangdong Province (1978-2006)
ZHAO Zhiqiang,GAO Jiangbo,LI Shuangcheng,WANG Yanglin
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract590)            Save
By using a modified emergy-based ecological footprint model, the authors accounted and analyzed the changing processes of the per capita consumption ecological footprint and local output ecological carrying capacity in Guangdong Province from 1978 to 2006. Growth trend was found in both processes, and the growth rate of the output carrying capacity was higher than consumption ecological footprint. The authors researched the structural characteristics and trends of consumption ecological footprint and local output ecological carrying capacity accordingto the different accounts of biological resources, energy resources, industry, human resource and trade respectively. The growth of the non-biological resources consumption footprint was the most important part of the growth of total consumption, while the growth of product output carrying capacity also benefited from the second major industrial development. Extensive trade and the continuous improvement of human resources since reform and opening up policy were the major reasons for continuous improvement of carrying capacity in Guangdong Province.
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Evaluating the Ecological Service Function of Soil Conservation Based on RUSLE and GIS
GAO Jiangbo,ZHOU Qiaofu,CHANG Qing,LI Shuangcheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract578)            Save
Under the support of GIS technique, the authors evaluated the capital stocks of the ecosystem's soil conservation with a case study in Beijing, Tianjin and Hebei Province. On the basis of the data of daily rainfall, NDVI, DEM, LUCC, and soil types of the study area, according to the Revised Universal Soil Loss Equation, the maximum amount of potential soil erosion and its actual quantities were calculated. The deviation between them was the conserved amount, which was converted into capital stocks with the methods of Shadow Price and Market Price. The result show that the value of the soil conservation in the study area was about 176.832 billion RMB yuan, which approximately equaled to the 21.41 percent of the total GDP in 2000, of which the preserved nutrient was about 167.797 billion RMB yuan and the alluvial bedload was 9.035 billion RMB yuan respectively. The contributing percent of individual ecosystems was as follows: the forest occupies 44.34%, cropland 44.91%, grassland and water 10.75%.
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Recurrence Quantification Analysis for Geographical Differences of the Coupling Relationship between NDVI and Climatic Factors
LI Shuangcheng,LIU Fengyuan,DAI Erfu,WU Shaohong
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract714)            Save
Recurrence quantification analysis (RQA) and cross recurrence plot (CRP) are used to analyze the relationship between the normalized difference vegetation index (NDVI) and climatic factors in the Southwest and Southeast Monsoon Regions in Yunnan longitudinal range-gorge region (LRGR). Results show that in the Southwest Monsoon Region the NDVI series has a higher certainty than that in the Southeast Monsoon Region. The coupling relationships of NDVI series in the two regions are between a completely random series and a deterministic series with noise. The two NDVI series have low synchronization in general, especially in the period 1987?1989 and 1991?1993. The NDVI series of the Southwest Monsoon Region lags behind that of the Southeast Monsoon Region. According to the CRP indices, the similarity, persistence time and stability of the coupling relationship between NDVI and precipitation series in the Southwest Monsoon Region are better than that of the Southeast Monsoon Region. Both the NDVI series and temperature series have similar trends. However, the difference of the CRP indices between the two regions is smaller. It is suggested that the interaction pattern of NDVI and temperatures has a smaller difference between the two regions.
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Ecological Risk Assessment of Regions Alongside Qinghai-Xizang Highway and Railway Based on Artificial Neural Network
CHEN Hui,LI Shuangcheng,ZHENG Du
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract643)            Save
Concept model of regional ecological risk is built for the characteristics of ecosystems alongside Qinghai-Xizang highway and railway based on MLP (Multilayer percetron) model. Seven indices such as snow hazard, drought hazard and landslide are selected to evaluate the integrated ecological risk of the ecosystems alongside Qinghai-Xizang highway and railway. Results show that Qaidam mountain desert region has the highest average ecological risk value (4.2585), followed by Guoluonaqu alpine scrub meadow region (2.7640) and Qinghai and Qilian mountain steppe region (2.7335) among these ecosystems alongside Qinghai-Xizang highway and railway through six natural regions. As far as land cover types are concerned, the top three ecological risk values appear in the needle-leaved forest (4.3096), desert ecosystem (4.1174) and land without vegetation (3.6182) respectively, which are higher than those in the other seven land cover types in the study site. Although the risk values are influenced by natural factors and human activities, they are more strongly controlled by natural factors. According to the ecological risk characteristics, these ecosystems alongside Qinghai-Xizang highway and railway are subdivided to four subregions, including Chaidam basin high risk region, Xidatan to Dangxiong moderate risk region, and east Qinghai, Qilian and south Qinghai slight risk regions.
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