基于^(137)Cs示踪的南方红壤丘陵区不同土地利用管理方式的侵蚀效应  

Study on Soil Erosion and Its Effect on Different Landuse Types in the Red Soil Hilly Area of South China Based on ^(137)Cs Tracing

作　　者：王晓燕[1] 李忠武[2] 修成贤 

机构地区：[1]长沙理工大学土木与建筑学院,长沙410114 [2]湖南大学环境科学与工程学院,长沙410082 [3]莱州市云峰中学,山东莱州261400

出　　处：《水土保持研究》2013年第2期1-4,共4页Research of Soil and Water Conservation

基　　金：国家自然科学基金(40971170;41271914)

摘　　要：南方红壤丘陵区因土壤侵蚀严重而成为生态脆弱地带。通过137 Cs示踪技术,采用相关土壤侵蚀定量模型,对南方典型红壤丘陵区不同土地利用与管理方式下不同地貌部位的土壤侵蚀及其导致的侵蚀效应进行了研究。结果表明:研究区的137 Cs的背景值为(1 920±125.6)Bq/m2;137 Cs含量在不同土地利用管理方式和地貌部位存在明显的分异;侵蚀强度总的变化趋势表现为:荒山>本地松林、水保林>桔园>桔园改苗圃地>苗圃,因侵蚀而导致的土壤有机质和其他理化性状也表现出大致相同的变化特征;而不同地貌部位的侵蚀模数则表现为坡顶相对较小,坡中和坡底则相对较大。Because of serious soil erosion and degradation, the red soil hilly region has become a fragile ecolog- ical area. Based on 137Cs tracing technique and soil erosion estimation models, the soil erosion rate and corresponding effect were studied on the representative land utilization of Shaoyang, Hunan province. The result showed that the reference inventory of 1arCs in the study area was （1 920±125.6） Bq/m2. 137Cs concentrations＇ distribution had obvious differentiation on the slope with different land use types and on the different parts of slope. The average soil erosion rate was also different, which decreased in the order of barren hill, local pine forest, soil and water conservation forest, citrus orchard, nursery garden changed from citrus orchard, nursery garden. The soil organic matter and other soil physicochemical properties also showed the same variation characteristics as soil erosion rate. On the different parts of slope, the soil erosion rate was relatively smaller on the top while relatively larger rate occurred on the middle and bottom of slope.

关 键 词：137Cs示踪 红壤丘陵区 土地利用 侵蚀效应 

分 类 号：S157[农业科学—土壤学]