中山大学学报自然科学版 ›› 2018, Vol. 57 ›› Issue (2): 32-41.

• 论文 • 上一篇    下一篇

土地覆盖类型变化对梯度发展流域的土壤侵蚀动态影响

苏春生1,吴孝情2,陈晓宏1,3,赖成光4,杨冰1,张力澜1   

  1. 1中山大学水资源与环境研究中心,广东 广州 510275;
    2 环境保护部华南环境科学研究所,广东 广州 510535;
    3 广东省华南地区水安全调控工程技术研究中心,广东 广州 510275;
    4华南理工大学土木与交通学院,广东 广州 510641
  • 收稿日期:2016-11-09 出版日期:2018-03-25 发布日期:2018-03-25
  • 通讯作者: 陈晓宏(1963年生),男; 研究方向: 水文水资源;E-mail:eescxh@mail.sysu.edu.cn

Dynamic impacts of land-cover change on soil erosion in a gradient development basin

SU Chunsheng1, WU Xiaoqing2, CHEN Xiaohong1,3, LAI Chengguang4,YANG Bing1, ZHANG Lilan1   

  1. 1 Center for Water Resources and Environment, Sun Yat-sen University, Guangzhou 510275, China; 
    2 South China Institute of Environment Sciences,the Ministry of Environment Protection of PRC, Guangzhou 510535, China; 
    3 Guangdong Engineering Technology Research Center of Water Security Regulation and Control for Southern China, Sun Yat-sen University, Guangzhou 510275, China;
     4 School of civil and transportation engineering,South China University of Technology,Guangzhou 510641,China;
  • Received:2016-11-09 Online:2018-03-25 Published:2018-03-25

摘要:

以1990,2000和2010年3期土地覆盖类型数据为基础,结合GIS技术利用RUSLE模型分析梯度发展的东江流域土壤侵蚀动态变化,结果表明:流域下游地区土地覆盖类型变化较大,大量水田、旱地、林地和草地转化为城镇用地、工矿建设用地以及园地;流域在1990,2000和2010年的平均土壤侵蚀量分别为15.22,15.41和15.47 t/ (hm2·a),均属于Ⅱ级/轻度侵蚀,但随时间增长而递增;侵蚀等级属于Ⅰ级和Ⅱ级的面积占全流域面积的90.95%~91.26%;
流域的土壤侵蚀量等级变化不明显,约有24 328 km2(91.14%)维持原有的侵蚀等级,而2 365 km2(8.86%)侵蚀等级发生改变。变化等级面积中,1 286 km2(4.82%)由低等级转变为高等级,1 079 km2(4.04%)由高等级转换为低等级。东江流域的土壤侵蚀情况与社会经济的梯度发展特征相一致,从上游到下游呈明显递增趋势。

关键词: 侵蚀, 水土保持, 降雨, RUSLE, GIS, 东江流域

Abstract:

This study used GIS technique and RUSLE model to analyze the dynamic impacts on soil erosion in the Dongjiang river basin, a gradient development basin, based on the landcover data in years 1990, 2000 and 2010 The results showed that the landcover in the downstream areas presented a large variation with a large number of paddy field, nonirrigated farmland, forestland and grassland converting to urban land, construction land and garden plot. The average soil erosion amounts reach 15.22 t/ (hm2·a), 15.41 t/ (hm2·a)  and 15.47 t/ (hm2·a), all of which belong to Level II but increased over the time. The percentage of the erosion areas belonging to Levels I-II ranges  90.95% to 91.26%. The level change of soil erosion is not significant: approximately 24328km2 (91.14%) areas maintained the original levels, but approximately 2365 km2 (8.86%) changed; among the changed areas, approximately 1286 km2 (4.82%) was converted from lower levels to higher levels, but approximately 1079 km2 (4.04%) was converted from higher levels to lower levels. The spatial distribution and its dynamic variation matched well with the gradation development of social economy, which showed an increasing trend from the upstream to downstream.

Key words: erosion, soil conservation, precipitation, RUSLE, GIS, Dongjiang River basin

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