Subjects: Geosciences >> Geography submitted time 2024-06-12 Cooperative journals: 《干旱区研究》
Abstract： The Lower Malian River Basin are typical loess plateau gully areas in eastern Gansu. They are of great significance for the sustainable development of regional ecosystems and for studying the temporal and spatial characteristics and response of water yield under the background of climate and land use change. Based on the InVEST (Integrated Valuation of Ecosystem Services and Trade-offs) model, the spatial and temporal patterns and change in water yield of the Lower Malian River Basin in 1990, 2000, 2010, and 2020 were quantitatively evaluated. The degree of influencing factors on the spatial differentiation of water yield function was analyzed using geographic detection. The results show that: (1) From 1990 to 2020, the total water yield of the Lower Malian River Basin first decreased, then increased, and then decreased again. Compared with 1990, the total water production in 2020 was reduced by 5.9 × 107 m3, which was a reduction of 25.43%. The water yield in different periods was higher in the southern and marginal areas and lower in the northern and central areas. (2) The water yield capacity of each land use type followed the order: construction land > bare land > agricultural land > low-coverage grassland > high-coverage grassland > shrub land > forest land > open water. (3) There was a significant positive correlation between water yield and precipitation, and a negative correlation between actual evapotranspiration and altitude. Precipitation and actual evapotranspiration were the main factors determining the spatial distribution and change in water yield, with q values of 0.616–0.735 and 0.517–0.653, respectively. The research results provide scientific evidence to support the development, utilization, and management of soil and water resources in the gully areas of the Loess Plateau in eastern Gansu.
Hits
Hits
Downloads
Comment