摘要
选择黔南峰丛洼地区的茂兰自然保护区的坡格森林洼地典型小流域,进行了泥沙堆积的137Cs示踪研究。(1)坡格森林洼地底部的土壤剖面属于农耕地剖面。(2)受岩土分布、微地形和土壤异质性的影响,137Cs初始沉降后的再分布不均匀,137Cs面积活度变异系数为1.54。相同组成特征的地块内部样点137Cs面积活度变异系数变化为0.36～0.54,变异相对较小。但137Cs面积活度不能表征土壤侵蚀状况。(3)典型沉积剖面B-1的单一137Cs峰值浓度出现在14～16cm,高浓度137Cs均匀分布深度小于当地犁耕层厚度20cm,说明1963年以来坡格森林洼地的堆积速率接近于0。
This study one typical forest depression of a peak-cluster area was selected as the study area in the Maolang nature reserve in southern Guizhou Province,and ^137Cs tracing research was conducted on sediment accumulation and water erosion.（1） The soil core profile was a cultivately disturbed profile.（2）Affected by earth-rock distribution,microtopography and soil heterogeneity,^137Cs redistribution after primary fallout was uneven,and ^137Cs inventories have a greater spatial variation coefficient of 1.54.And the section interior with the same composition showed smaller spatial variation in coefficient,ranging from 0.360.54.And it is shown that ^137Cs inventory in the soil section could not characterize the state of water erosion.（3） With reference to the ^137Cs depth distribution of typical profile B-1,the single ^137Cs peak value emerged at the depth of 14 cm to 16 cm in typical soil profile B-1,and higher ^137Cs concentrations in the soil profile are evenly distributed from 0cm to 16cm.The depth of higher ^137Cs even distribution was lower than the local ploughing depth （20 cm）,showing that the accumulation rate of sediment in the forest depression has been almost zero since 1963.
出处
《地球与环境》
CAS
CSCD
北大核心
2009年第4期366-372,共7页
Earth and Environment
基金
国家重点基础研究发展计划项目(2006CB403203,2007CB407206)
中国科学院知识创新工程项目(KZCX3-SW-448)
中国科学院水土保持研究所国家重点实验室基金项目(10501-109)资助
关键词
^137Cs含量
沉积剖面
森林洼地小流域
泥沙堆积速率
喀斯特峰丛洼地
茂兰
137Cs content
deposited sediment profile
small forest depression catchment
sediment accumulation rate rate
karst peak-cluster depression
Maolan
