基于最小数据集的喀斯特不同利用方式下土壤质量评价

Assessment on Soil Quality under Different Land Use Patterns in Karst Area Based On Minimum Data Set

为了探究贵州喀斯特区域不同土壤利用方式对土壤质量的影响,我们对该地区的林地、人工草地、天然草地、农田、弃耕地5种土地利用方式下的土壤理化性质进行研究。基于最小数据集对该区域的土壤质量进行评价,构建的最小数据集包括:土壤pH值、容重、全盐、阳离子交换量、全氮、有效铜、有效铁等指标。结果表明:全量数据集和最小数据集获得的土壤质量均表现为林地>人工草地>天然草地>农田>弃耕地;人工草地、天然草地、农田、林地的土壤质量等级为二级,位于土壤质量分级中的“较高”水平,弃耕地土壤质量为三级,位于“中等”水平。以上结果表明,人为对自然生态系统的开垦降低了土壤的质量。

This study investigated the effects of management practices on soil quality in Karst area of Guizhou Province.Samples were collected from woodland,artificial grassland,natural grassland,farmland and abandoned farmland for analyisis of soil pH,bulk density,total salt,cation exchange capacity,total nitrogen,available copper,and available iron.On basis of the full data set(TDS)and the smallest data,the soil quality ranged as follows:forest land>artificial grassland>natural grassland>farmland>abandoned farmland.The soil quality of artificial grassland,natural grassland,farmland,and woodland was Grade II,which located at the“higher”level.,the soil quality of abandoned farmland was at the third level,which was located at the“medium”level.It was concluded that agricultural practice decreased the soil quality.