基于RWEQ模型的疏勒河流域防风固沙功能价值评估OACSTPCD

The Shule River Basin is located in the northwest inland region of China and is a key node of the Belt and Road Initiative.In recent years,with the increasing intensity of global changes and economic and social activ-ities,problems,such as the rapid expansion of construction land and desertification have affected the sustainable development of regional ecology and economic society.The Shule River Basin is located at the center of the northern sand prevention belt of China,and an evaluation of its wind prevention and sand fixation value is of great ecological significance for building a regional ecological security pattern and ensuring sustainable develop-ment of the basin.On the basis of the revised wind erosion equation model,the value of wind prevention and sand fixation in the Shule River Basin from 2008 to 2018 was evaluated.The results are as follows:(1)The total amount of wind prevention and sand fixation in the Shule River Basin from 2008 to 2018 was 43.927×104 to 129.530×104 t·km-2,with an increasing trend in wind prevention and sand fixation capacity.(2)The value of wind prevention and sand fixation in the Shule River Basin rapidly increased from 2008 to 2018,with an annual average value ranging from high to low to reduce the value of land loss(99.46%),maintain the value of soil fertil-ity(0.47%),maintain the value of soil organic matter(0.04%),and reduce the value of economic loss of transpor-tation(0.03%).(3)The function of wind prevention and sand fixation in river basins is closely related to land use.Among them,the areas with stronger windproof and sand-fixing capability are primarily distributed in grassland,cropland,and other areas with higher vegetation cover;the low-value areas are primarily distributed in unused land of the land use type of the river basin.(4)Natural indicator factors have a greater impact on the value of wind and sand fixation functions in river basins than social factors.These findings can provide a basis for deter-mining the subject and object of ecological compensation and compensation standards in the Shule River Basin.