针对水土流失的三峡重庆库区土地质量评价

Soil Erosion Emphasized Land Quality Evaluation in Chongqing Area of the Three Gorges Reservoir

以三峡重庆库区为研究对象,基于PSR(压力—状态—响应)框架,针对水土流失建立土地质量指标体系。压力指标包括降雨压力、可蚀性压力、地形压力、土地压力、人口压力、收入压力等指标;状态指标包括侵蚀状态、肥力状态、格局状态等指标;响应指标包括利用响应和政策响应。采用专家打分、分级赋值、综合评价的方法,对三峡重庆库区土地质量进行了初步评价。结果表明,三峡重庆库区的土地质量综合得分为2.76分,土地质量偏低评定为3等。压力指标得分最低为2.14分,状态指标得分为3.13分,响应得分为3分。人为干扰是引起区域土地质量低下的最主要原因,紫色土广布和地形坡度大等自然地理状况是土地质量低下的第二大原因。本研究可为同类地区土地质量评价和退化土地的生态恢复提供一定的借鉴意义。

We established a land quality indicator system for Chongqing area of the Three Gorges Reservoir Region,using the press—state—response frame(abbreviated as PSR).The pressure index include rainfall, soil erodibility,terrain,land,population and income pressure,etc.;The condition index include soil erosion, fertility and pattern condition;The response index include usage and policy response.The land quality of the Three Gorges Reservoir region was primarily evaluated with the method of experts scoring,hierarchi...