The Heterogeneity and Its Influencing Factors of Soil Nutrients in Peak-Cluster Depression Areas of Karst Region

作     者：ZHANG Wei CHEN Hong-song WANG Ke-lin SU Yi-rong ZHANG Ji-guang YI Ai-jun 

作者机构：Institute of Subtropical Agriculture The Chinese Academy of Sciences Changsha 410125 P.R.China Huanjiang Experimental Station of Karst Ecosystem Huanjiang 547100 P.R.China Graduate School Chinese Academy of Sciences Beijing 100049 P.R.China 

出 版 物：《Agricultural Sciences in China》 (中国农业科学（英文版）)

年 卷 期：2007年第6卷第3期

页      面：322-329页

学科分类：0710[理学-生物学] 09[农学] 0903[农学-农业资源与环境] 0901[农学-作物学] 0902[农学-园艺学] 090301[农学-土壤学] 

基　　金：National Natural Science Foundation of China,NSFC: 40501034 Chinese Academy of Sciences,CAS: 0 120022005541 3 

主　　题：karst peak-cluster depression soil nutrient land use type topography factors soil organic carbon 

摘      要：By selecting a typical peak-cluster depression area of karst region in Southwest China, we evaluated the effect of land use types and topographic factors on soil nutrients. Grid and line sampling methods were used to sample soil in depression and slope lands respectively, and classical statistical tools were applied to analyze the spatial variability character of soil organic carbon （SOC）, total nitrogen （TN）, total phosphorus （TP）, total potassium （TK）, available nitrogen （AN）, available phosphorus （AP）, available potassium （AK）, pH, and C/N. It was found that land use type was the dominant factor that effected the spatial heterogeneity of SOC, TN, TP, TK, AN, and AP. The content of SOC, TN, and AN decreased with the increase of land use intensity. Due to high fertilizer input, TP and AP in tillage fields were higher than those in the other land use types. TK had no obvious change trend among various land use types. Topographic factors had a significant effect on SOC, TN, TP, AN, AP, AK, and pH. Habitat factor was the dominant factor that effected AK. Altitude factor was the dominant factor for pH. However, all of these factors had no significant effect on C/N. Tillage practice had important effect on soil nutrients loss and soil degradation in the fragile karst ecosystem, and the input of organic manure should be increased in this region.