三峡库区紫色土坡地土壤退化程度评价及驱动机制  

Evaluation and Driving Mechanism of Land Degradation in a Sloping Field of Purple Soil in Three Gorges Reservoir Area

作　　者：董杰[1] 段艺芳[1] 许玉凤[1] 杨达源[2] 周彬[3] 

机构地区：[1]聊城大学环境与规划学院,山东聊城252059 [2]南京大学地理与海洋科学学院,江苏南京210093 [3]宁波大学文学院,浙江宁波315211

出　　处：《水土保持通报》2009年第4期51-56,共6页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金(40272126);国土资源部重点项目"三峡库区岸坡第四纪堆积特征及沿江公路路基稳定性研究"

摘　　要：以三峡库区紫色土坡地为例,运用模糊综合评判模型,对该区不同土地利用方式和不同坡度段的土壤退化程度进行了评价,并分析了引起该区土壤退化的主要驱动因子。结果表明,菜地、园地为未退化,耕地、林地为轻度退化,草地、荒地为中度退化,建设用地为重度退化;不同坡度段紫色土坡地皆为中度退化。人类活动是三峡库区紫色土坡地土壤退化的主要驱动力,土壤侵蚀是土壤退化的主要形式之一。地形、气候、母岩和紫色土特性等自然因子为土壤退化提供了条件;植被破坏,坡耕地面积较多、垦殖率高,耕作措施不当和种植制度不合理等人为因素则加速和加剧了该区土壤退化的进程。Taking a sloping field of purple soil in the Three Gorges Reservoir area as an example, the authors synthetically evaluate purple soil degradation using Fuzzy model based on different landuse types and differ- ent slope segments and analyze the main driving forces leading to the degradation. Results show that vegeta- ble land and garden are not subject to degradation; cultivated land and woodland have light degradation; grassland and wasteland have moderate degradation; construction area have severe degradation; and all the sloping fields of purple soil in different slope segments have moderate degradation. Human activities are the main {actor of soil degradation in the Three Gorges Reservoir area and soil erosion is the main type of soil degradation. Natural factors such as landform, climate, parent rocks, purple soil characteristics are the con- ditions to soil erosion. Human factors such as severe vegetation destruction, a great many of sloping fields, and high reclamation rate, improper cultivation measure, and irrational planting system accelerate the soil degradation in the area.

关 键 词：紫色土坡地 土壤退化 驱动机制 三峡库区 

分 类 号：S157[农业科学—土壤学] S158.1[农业科学—农业基础科学]