Comprehensive Evaluation of Soil Fertility of Different Land Use Patterns of Changsha Arable Land Based on Principal Component and Cluster Analysis
To quantitatively evaluate the influence of different land use patterns on soil fertility characteristics of arable land in Changsha City,the soil pH value,organic matter,total nitrogen,alkaline nitrogen,available phosphorus,available potassium and slow-acting potassium nutrient contents were analyzed at each sampling point during March to September 2023. Paddy fields,tea gardens,orchards and vegetable gardens were taken as experimental objects,and the differences in the comprehensive soil fertility of different land use patterns were quantitatively evaluated by correlation analysis,principal component analysis and cluster analysis. The results showed that:(1) soil fertility characteristics of different land use patterns in Changsha City varied greatly,with large differences in soil fertility characteristics of tea gardens and moderate differences in soil fertility characteristics of vegetable gardens. (2) There was no significant difference in soil pH among paddy fields,orchards and vegetable gardens in Changsha City,indicating that they were less affected by the land use patterns. On the contrary,there were significant differences in soil alkaline nitrogen and available potassium contents among the four different land use patterns,indicating that soil alkaline nitrogen and available potassium contents in Changsha City were greatly affected by the four different land use patterns of paddy fields,tea gardens,orchards and vegetable gardens. (3) The results of principal component composite score calculation and cluster analysis showed that the soil fertility of paddy field was the best among the different land use patterns in Changsha City,followed by vegetable gardens and orchards,and the tea gardens was the worst. Overall,the soil pH value of tea gardens was 4.51 (acidic),which was significantly lower than that of paddy fields,orchards and vegetable gardens,seriously affecting soil fertility. Therefore,in order to meet the acidic environment for the growth of tea trees,it is necessary to increase soil nutrient inputs,and regulate soil pH as a supplement when improving soil fertility.
Changsha Cityland use patternssoil fertilityprincipal component analysiscluster analysiscomprehensive evaluation
万方数据
维普
