关键词: 土壤养分制图, 全氮, 案例推理, 土壤-景观推理模型

Abstract:

The 111 soil samples were collected in Wangjiagou watershed of Three Gorges Reservoir Area with complex geographical environment. Total nitrogen content in the soil was measured, and the land use data and elevation, slope, plan curvature, profile curvature, topographic position index and topographic wetness index were collected. The soil total nitrogen was mapped by using the soil land inference model (SoLIM) that is based on case reasoning. The results showed that, land use type data can be used to improve the accuracy of prediction. The spatial distribution of soil nutrients produced by the SoLIM contained more information, and presented more details of spatial variability of soil nutrients. Therefore, the SoLIM based on case reasoning was validated a good method for soil nutrient mapping in the small study area with complex geographical environment.

Key words: soil nutrient mapping, total nitrogen, case reasoning, soil land inference model(SoLIM)