成都平原-山地过渡带不同高程下耕地土壤养分变异特征分析--以彭州市为例

[Objective] This paper aimed to investigate the variation characteristics of soil nutrients of cultivated land at different elevation in the transition zone between plain and mountain of Chengdu. [Method] Pengzhou city as the study area was chosen, 1142 topsoil samples at different elevation were collected, and the nutrient data were analyzed with traditional statistics, correlation analysis, variance analysis, semi-variogram model optimization and Co-kriging interpolation. [Result] The correlation relationship between available potassium(AK), soil organic matter(SOM) and elevation were overwhelmingly positive, and the correlation relationship between alkali-hyclrolyzable nitrogen(AN), available phosphorus(AP) and elevation were overwhelmingly negative. The content of AN and AP decreased with elevation increasing and then obviously rebounded at the area above 913 m, the content of AK and SOM increased with elevation. The area with relatively low content of AN, AP and SOM was mainly concentrated in the zone of the most transitional elevation. [Conclusion] The result of this study could be helpful for the improvement of the productivity of cultivated land, soil utilization and protection in the transition zone between plain and mountain of Chengdu, which was of great significance for promoting the sustainable utilization of the resource of cultivated land and ensuring southwest China’s grain security. [ABSTRACT FROM AUTHOR]