基于InVEST模型的黄河流域砒砂岩区土壤保持功能演化及驱动机制

Evolution and Driving Mechanisms of Soil Conservation Function in Pisha Sandstone Area of the Yellow River Basin Based on the InVEST Model

研究区域土壤保持功能变化及环境驱动因子作用机制对区域生态环境建设具有重要的理论意义,可为水土保持决策提供参考。借助InVEST模型对近20 a间黄河流域砒砂岩区生态系统的土壤保持功能变化进行分析,利用地理探测器中的因子探测器和交互探测器分析该区土壤保持功能的主导因子和两两交互作用对土壤保持的影响。结果表明:1)砒砂岩区土壤侵蚀在2000-2020年呈现改善趋势,且主要以微度侵蚀为主,研究期间平均侵蚀模数为922.44 t·km^(-2)·a^(-1);2)土壤保持功能空间分布上与侵蚀状况基本一致,呈“西北低,东南高”的分布趋势,研究区土壤保持变化情况主要以未变化为主,土壤保持功能下降区和增强区分别占总面积的2.47%、3.62%;3)植被覆盖度对砒砂岩区土壤保持功能起着绝对主导作用,且“强强”双因子交互作用更有助于提高土壤保持功能,植被覆盖度∩降水的解释力最强,为45.61%。

Studies of regional soil conservation function change and the mechanism of environmental driving factors have important theoretical significance for regional ecological environment construction,and can provide reference for soil and water conservation.In this study,the change of soil conservation function of the ecological environment system in the Pisha Sandstone area of the Yellow River Basin in the past 20 years was analyzed with the help of the InVEST model,and analyzed the dominant factors of soil conservation function and the influence of pair-wise interaction on soil conservation by using the factor detector and interaction detector in the geodetector.The results indicated that 1)soil erosion in the Pisha sandstone area showed an improvement trend during 2000-2020,and the main erosion was slight.The average erosion modulus during the study period was 922.44 t·km^(-2)·a^(-1).2)The spatial distribution of soil conservation function was basically the same as that of erosion,showing the distribution trend of.The changes in soil conservation in the study area were mainly unchanged,and enhanc for 2.47%and 3.62%of the total.3)The vegetation coverage played an absolutely dominant role in soil conservation function in Pisha area,and under the interaction of factors,it was more helpful to improve the soil conservation function.The explanation of vegetation coverage and precipitation the strongest,45.61%.