人为开垦加速侵蚀与土壤质量演变机理及其调控

It is increasingly proposed as an integrative indicator of environmental quality, food security and economic viability. Soil structure is a base for its ecological function and sensitive to environmental disturbance. It is especially ture on the Loess Plateau where soil erosion and water sarcity are the main agro-environmental pressure, and the soils are chemically homogeneous. The present research has developed a strategy for selecting minimum data set for soil quality indictors by expert opinion and principal components analysis. Depth of topsoil, aggregate stability, organic matter, micromorphological characteristics and porosity, were investigated in loess soil in forestland and cultivated land, and statistically quantified by computer software. It implies that soil structural indicators were a sensitive proxy indicator for soil quality in that region. The main driving force of soil quality change can be categorized into pollution, erosion, land use and socio-economic activities. Long time minitoring data in Ziwuling and Changwu were collected. A conceptual framework of a Web-GIS-based information system was setup to monitor and model the dynamics of soil quality in response to potential disturbances.

侵蚀土壤的质量演变问题在生态环境调控中起着重要的作用，也是现代土壤学研究的前沿领域。本研究以林区人为开垦地为试验基地，以多年的观测资料为基础，建立侵蚀条件下土壤质量评价指标体系；研究观测不同降雨情况下人为开垦加速侵蚀与土壤质量时空演变机理，为提高侵蚀土壤生产力及生态环境重建提供科学依据和调控对策。