关键词: 土地利用变化, 水文效应, InVEST 模型, 黑河中游

Abstract:

Based on the land use data (1986, 1995, 2000 and 2010) and InVEST model, this paper analyzes the land-use change of the middle reaches of Heihe River in the recent 25 years and simulates the water yield of the study area under different land use patterns. Multiple linear regression model is used to explore the influence on the water yield caused by different land use types. The results show that 1) the main types of land use in the middle reaches of Heihe river are bare ground, grass land and farmland. The structure of land use has been changed a lot since 2000. A large number of farmland has transformed into construction land meanwhile water area starts a substantial reduction. 2) 7.3 is considered as the suitable Z value for the study area. From the perspective of subwatershed, the water depth is diminishing from southeast to northwest. 3) The increase of woodland may restrain the water yield. On the contrary, grassland, construction land and bare ground may promote the water yield. Farmland will cause positive or negative hydrological effects due to the different patterns of utility. These results can provide reference for the balance of oasis’ land and water resources.

Key words: land-use change, hydrological effect, InVEST model, middle reaches of Heihe river