中国水土保持科学2017，Vol.15Issue(3)：36-42,7.DOI:10.16843/j.sswc.2017.03.005
我国东部水蚀区坡耕地土壤质量现状分析
Present condition analysis of sloping farmland soil quality in the eastern water erosion zone of China
摘要
Abstract
[Background]Soil quality is the foundation of land productivity.Sloping farmland is an important kind of cultivable land resource in the water erosion zone of China.The current study is aimed at investigating the general situation of sloping farmland soil quality in this region.[Methods] We collected 36 soil samples from the soil layer of 0-20 cm in this region dispersedly and tested 28 soil physical and chemical indicators for each soil sample.The method of principal component analysis (PCA) was used to select the key indicators for soil quality analysis.Membership functions were used to transform the key indicators into dimensionless data,and the weighted multiplication method was applied to calculate soil quality index (SQI) for each sampling point.[Results] 1) The variation coefficient of available P was the maximum,and the variation coefficient of microaggregate volume fraction was the minimum.Most of the indicators had intermediate variability.The mean variation coefficient of soil physical indicators was much smaller than soil chemical indicators.2) The key indicators for assessing soil quality were clay volume fraction,silt volume fraction,microaggregate volume fraction,soil organic matter,pH,Cd and Cr.Cr had the highest membership value,while pH had the lowest membership value.The membership values of Cd were significantly different between the six secondary partition regions.3) The mean value of the SQI was 0.64 ±0.16.There was no significant difference about SQI between the six secondary partition regions.The proportions of SQI ranked as low,middle,high,higher level were 8.33％,38.89％,36.11％ and 16.67％ of the total area of sloping farmland,respectively.[Conclusions] On the whole,the general situation of sloping farmland soil quality in the region was fine,but we still need to strengthen fertilization and amelioration in the regions with low soil quality.These findings of the study had great significance for understanding and maintaining sloping farmland soil quality,soil quality grade classification and regionalization,exploiting and utilizing land resource reasonably in the eastern water erosion zone of our country.关键词
土壤质量/主成分分析/关键指标/土壤质量指数/坡耕地/水蚀区Key words
soil quality/principal component analysis/key indicator/soil quality index/sloping farmland/the eastern water erosion zone of China分类
农业科技引用本文复制引用
马芊红,张光辉,耿韧,王浩..我国东部水蚀区坡耕地土壤质量现状分析[J].中国水土保持科学,2017,15(3):36-42,7.基金项目
国家自然科学基金重点项目“退耕驱动近地表特性变化对侵蚀过程的影响及其动力机制”(41530858) （41530858）
国家自然科学基金创新研究群体项目“地表过程模型与模拟”(41621061) （41621061）
