Dynamic Changes of Soil Erosion in Three Gorges Reservoir Area from 2000 to 2012 -A Case Study at Wanzhou District of Chongqing City

LU Chuanhao; DAI Fuqiang; LIU Gangcai

doi:10.13961/j.cnki.stbctb.2017.06.001

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Dynamic Changes of Soil Erosion in Three Gorges Reservoir Area from 2000 to 2012 -A Case Study at Wanzhou District of Chongqing City

- Dynamic Changes of Soil Erosion in Three Gorges Reservoir Area from 2000 to 2012 -A Case Study at Wanzhou District of Chongqing City
- Bulletin of Soiland Water Conservation Vol. 37, Issue 6, Pages: 1-8(2017)
- 作者机构：
  
  1. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041
  2. 中国科学院大学,北京,100049
  3. 重庆工商大学旅游与国土资源学院,重庆,400067
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2017.06.001
  CLC：
- Published：2017
- 稿件说明：
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LU Chuanhao, DAI Fuqiang, LIU Gangcai. Dynamic Changes of Soil Erosion in Three Gorges Reservoir Area from 2000 to 2012 -A Case Study at Wanzhou District of Chongqing City[J]. Bulletin of Soiland Water Conservation, 2017, 37(6): 1-8.
DOI：

LU Chuanhao, DAI Fuqiang, LIU Gangcai. Dynamic Changes of Soil Erosion in Three Gorges Reservoir Area from 2000 to 2012 -A Case Study at Wanzhou District of Chongqing City[J]. Bulletin of Soiland Water Conservation, 2017, 37(6): 1-8. DOI： 10.13961/j.cnki.stbctb.2017.06.001.

摘要

[目的]研究重庆市万州区土壤侵蚀在三峡成库前后的动态变化特征，为区域防治水土流失和改善土地利用提供科学依据。[方法]运用修正通用土壤流失方程（RUSLE）和GIS工具，基于各期基础数据，分析万州区2000-2012年土壤侵蚀的动态变化过程。[结果]（1）2000-2012年万州区年均土壤侵蚀模数经历了先下降后小幅回升的变化过程，最小值出现在2007年，2012年较之2000年剧烈侵蚀区面积下降了34.24%，微度侵蚀区面积上升了7.66%；（2）研究期内，万州区侵蚀等级转化的空间分布与侵蚀分布具有较高的相似性，侵蚀等级转化活跃斑块集中于铁峰山与方斗山之间的丘陵低山地区，东南侧山地区域转化活跃度较低；（3）土壤侵蚀强度等级转移矩阵表明2000-2012年侵蚀强度整体向低等转化；其中2000-2007年土壤侵蚀强度不变地区占76.56%，22.78%的区域向低级转化，转变幅度较大；2007-2012年侵蚀呈现相反的转变态势，稳定比例较高，仅有9.77%的区域向高级转化。[结论]2000-2012年万州地区地表的侵蚀状况在逐步减轻，土壤侵蚀强度下降明显，但2007年之后侵蚀状况有所反弹，部分区域的侵蚀形势仍较为严峻，应进一步制定有效的侵蚀防治方案，推进合理的土地利用措施，降低侵蚀量，提高土壤保持能力。

Abstract

[Objective] The study analyzed soil erosion in different stages during the construction of Three Gorges Project in order to give support to decrease soil erosion and to improve land-use plan.[Methods] Wanzhou District of Chongqing City was taken as research region

the original observed data

revised universal soil loss equation(RUSLE) and GIS method were applied to investigate the dynamic changes of soil erosion.[Results] The result showed that from year 2000 to 2012

soil erosion intensity decline first and reached the lowest in 2007

then rose slightly. Severe erosive area decreased by 34.24%

and mild erosive area increased by 7.66%. The spatial distribution of soil erosion grade variation was similar to that of actual soil erosion during the study period. Soil erosion grade variation also had the same distribution characteristics in different period. The most active change of erosive grade concentrated in the area between Tiefeng mountain and Fangdou mountain. The southeast part of the research area had low activity in grade change. Transfer matrix of soil erosion intensity showed that soil erosion intensity declined from 2000 to 2012. From 2000 to 2007

about 76.56% of the research area stayed at its original level; 22.78% of the area downgraded gradually. The second stage

from 2007 to 2012

trend of change in erosion intensity was stable

merely 9.77% of the area transformed to higher level.[Conclusion] In 2000-2012

the soil erosion of the surface at Wanzhou District was gradually

and the soil erosion decreased obviously

but after 2007

the erosion situation rebounded

and the erosion situation in some areas was still serious. There is still a strong need for adopting soil erosion control measures

for improving land use measures

and reducing erosion and raising the level of soil conservation.

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