应用生态学报2011，Vol.22Issue(3)：593-599,7.
桂西北喀斯特坡地土壤137Cs的剖面分布特征及其指示意义
137Cs profile distribution character and its implication for soil erosion on Karst slopes of Northwest Guangxi
摘要
Abstract
This paper studied the profile distribution characters of 137 Cs and soil organic carbon (SOC) on the Karst slopes and in the fissures in typical peak-cluster depression in Northwest Guangxi, aimed to approach the applicability of 137 Cs method on Karst slopes and the implication of 137 Cs for the characteristics of slope soil erosion. In all test profiles, there was a significant correlation between 137Cs and SOC, indicating that both of them might have the same loss pathway. On the slopes under secondary forests, 137 Cs mainly existed within the depth 0-24 cm. On the upper middle and middle slope sites, 137 Cs had an exponential decrease with depth, indicating no or slight surface erosion; while on the foot slope site, the distribution pattern of 137 Cs indicated severer erosion. On the slopes with cultivated lands, 137 Cs distributed uniformly within the plough layer. In the upper middle and middle slopes profiles, 137Cs mainly existed in the depth around 15 cm and far less than the background value, indicating severe soil erosion; while in foot slope profiles, 137 Cs was aggraded to the depth 45 cm. A discontinuous distribution of 137 Cs in the profiles was detected on the foot slopes under secondary forests, on the upper middle and foot slopes of cultivated lands, and in the fissures, indicating that the soil particles on Karst slopes had a trend of losing with rainwater to the underground, but the loss quantity was negligible, compared with surface erosion.关键词
喀斯特/土壤侵蚀/137Cs/土壤有机碳/剖面分布分类
农业科技引用本文复制引用
冯腾,陈洪松,张伟,聂云鹏,王克林..桂西北喀斯特坡地土壤137Cs的剖面分布特征及其指示意义[J].应用生态学报,2011,22(3):593-599,7.基金项目
中国科学院西部行动计划项目(KZCX2-XB2-08)、国家自然科学基金项目(30800162)和中国科学院青年人才领域前沿基金项目(ISACXLYQY-QN-0704)资助. （KZCX2-XB2-08）
