基于^(137)Cs示踪的大沽河流域土壤侵蚀模数研究  

PRELIMINARY ESTIMATE OF SOIL EROSION MODULUS IN THE DAGUHE RIVER BASIN USING ^(137)CS TRACING METHOD

作　　者：张云吉[1] 宫立新[2] 金秉福[1] 董志成[1] 

机构地区：[1]鲁东大学地理与规划学院,烟台264025 [2]中国海洋大学海洋地球科学学院,青岛266100

出　　处：《海洋地质与第四纪地质》2013年第6期165-172,共8页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40246026);海洋沉积与环境地质国家海洋局重点实验室开放基金项目(MASEG200803)

摘　　要：运用137 Cs示踪技术首次研究了大沽河流域土壤侵蚀特征,分析了137 Cs在土壤剖面中的分布规律,讨论了土壤侵蚀与深度、土壤粒度等因素间的关系。结果表明:大沽河流域小沽河河段和大沽河上游段流域土壤的年平均侵蚀模数分别为468t/(km2·a)和308t/(km2·a),均属轻度侵蚀;土壤剖面中137 Cs分布呈尖峰型,集中赋存于约30cm深度以内,且峰值不在表层;137 Cs的面积活度与土壤颗粒粒级间存在明显的对应关系,特别是与>4Φ颗粒含量呈显著正相关,说明137 Cs主要被吸附于土壤细颗粒(粉砂和黏土矿物)表面,而较粗颗粒的吸附量很小。The 137Cs tracer method was used for estimate of soil erosion in the Daguhe River Basin. Also discussed are the process and features of erosion, the relationships between soil erosion and the erosional depth and soil granularity. The soil erosion modulus of the Xiaoguhe River and the upper Daguhe River is 468 t/（km2 · a） and 308 t/（km2 · a） respectively, both belonging to moderate water erosion. In soil pro- files, ^137 Cs is mainly concentrated below about 30 cm in depth. No peak has been found in top soils. There is an obvious positive correlation between 137Cs concentrations and soil grain sizes, especially for the soils bigger than 4 Ф （〈0. 063 mm）. It is inferred that 137Cs was mainly adsorbed on the surface of silly sand and clay minerals, rather than coarse particles.

关 键 词：^137CS 土壤侵蚀 大沽河流域 

分 类 号：P597.1[天文地球—地球化学]