南方红壤区水土流失动态演变趋势分析  

Changes of Soil and Water Loss in Red Soil Region of Southern China

作　　者：梁音[1] 张斌[1] 潘贤章[1] 李德成[1] 史德明[1] 穆欢[1] 杨轩[1] 

机构地区：[1]中国科学院南京土壤研究所,南京210008

出　　处：《土壤》2009年第4期534-539,共6页Soils

基　　金：国家重点基础研究发展计划项目(2007CB407206);中国科学院知识创新工程前沿项目(ISSASIP0602);"中国水土流失与生态安全综合科学考察"项目(2005SBKK)资助

摘　　要：利用水利部3次土壤侵蚀遥感调查数据,结合实地抽样调查,分析了南方红壤区水土流失演变态势:南方8省区水土流失面积从20世纪50年代初的10.5万km2增加到2002年的19.6万km2,净增加了9.1万km2,1986年前呈增加趋势,之后呈逐步减少的趋势,到1996年实现了治理大于破坏的历史性转变。不同时段水土流失演变的趋势和增减速率各异,且随着时间的推移增减幅度在减小。抽样结果显示,2002—2005年的3年间,南方8省考察区水土流失面积共减少约4500km2,年均减幅为1.2个百分点,按此速度估算,南方8省区19.6万km2水土流失面积需要130年以上的治理时间,因此需要进一步加大治理力度。The soil erosion data of soil erosion at different historical times were used in this paper to analyze the changes of soil and water loss in red soil region of southern China. The soil erosion area of all the eight southern provinces increased from the early 1950s＇ 1.05×10^5 km^2 to 2002＇s 1.9×10^5 km^2. Soil erosion area increased before 1986, and decreased gradually after 1986 in the recent 50 years, and in 1996 it reached the turning point of soil loss control. The changing tendency and rate of soil erosion were various in different periods, the range became smaller gradually. Field survey showed that from 2000 to 2005 the area of soil and water loss decreased by 4.5×10^3 km^2 with an annual decreasing rate of 1.2%, which means at least 130 years needed to finish the control task of the current 1.96×10^5 km^2 eroded area.

关 键 词：水土流失 演变趋势 南方8省区 南方8省考察区 

分 类 号：S157.1[农业科学—土壤学]