Impacts of Land Use Changes on Streamflow in Upper Reach of Sancha River Basin During 1995-2016

Tian Renwei; Zhao Cuiwei; He Zhonghua; Xu Zhirong

doi:10.13961/j.cnki.stbctb.20190321.002

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Impacts of Land Use Changes on Streamflow in Upper Reach of Sancha River Basin During 1995-2016

- Impacts of Land Use Changes on Streamflow in Upper Reach of Sancha River Basin During 1995-2016
- Bulletin of Soiland Water Conservation Vol. 39, Issue 3, Pages: 12-18(2019)
- 作者机构：
  
  贵州师范大学地理与环境科学学院,贵州,贵阳,550025
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20190321.002
  CLC： S715.3;U412.1
- Published：2019
- 稿件说明：
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Tian Renwei, Zhao Cuiwei, He Zhonghua, et al. Impacts of Land Use Changes on Streamflow in Upper Reach of Sancha River Basin During 1995-2016[J]. Bulletin of Soiland Water Conservation, 2019, 39(3): 12-18.
DOI：

Tian Renwei, Zhao Cuiwei, He Zhonghua, et al. Impacts of Land Use Changes on Streamflow in Upper Reach of Sancha River Basin During 1995-2016[J]. Bulletin of Soiland Water Conservation, 2019, 39(3): 12-18. DOI： 10.13961/j.cnki.stbctb.20190321.002.

摘要

[目的]分析1995—2016年间黔中水利枢纽工程的水源区——三岔河上游流域降雨、径流以及土地利用变化情况，通过探讨土地利用变化对径流的影响，为预测未来流域水资源变化规律和黔中水利枢纽工程水资源的调配提供一定的参考依据。[方法]采用常规线性回归和结果模拟来分析降雨和径流的关系，利用土地利用动态变化指标和转移矩阵研究土地利用变化对径流的影响。[结果]20 a来三岔河上游降雨和径流总体呈波动下降的趋势，其演变过程划分为两个阶段：1995—2010年（第一阶段）降雨和径流呈持续下降趋势，2010—2016年（第二阶段）降雨和径流总体呈波动下降趋势，但径流下降幅度较大。1995年以来，流域土地利用结构变化比较明显。草地和林地面积增加5.33%和3.63%，耕地减少了6.92%，耕地向草地、林地和建设用地的转换构成土地利用变化的主导过程。除降雨影响外，土地利用变化是造成径流持续减少的主要原因。2010—2016年，草地和林地分别增加了19.93%和5.25%，耕地和未利用土地分别减少13.93%和87.97%，表明土地利用变化是造成径流大幅减少的主要原因。此外，黔中水利枢纽工程平寨水库的修建，在一定程度上对径流减少具有重要作用。[结论]三岔河上游土地利用变化与径流的变化联系紧密，土地利用变化的结果使径流量减少。

Abstract

[Objective] This study investigated the rainfall

runoff

land use changes during the period of 1995-2016 in the upper reaches of Sancha river basin

the water source area of the Qianzhong hydraulic project. The impacts of land use change on runoff were explored in order to provide a reference for predicting future changes of the water resources in the basin and the allocation of water resources in Qianzhong hydraulic project.[Methods] The relationship between rainfall and runoff was analyzed by conventional linear regression and result simulation. The impact of land use change on runoff was studied by using the land use dynamic change index and transfer matrix.[Results] The rainfall and runoff in the upper reaches of Sancha river watershed fluctuated and declined during the past 20 years

and the evolution processes could be divided into two stages:1995-2010 (stageⅠ) rainfall and runoff showed a downward trend. 2010-2016 (stageⅡ) rainfall and runoff showed a downward trend

but the decline of runoff was greater than rainfall. Since 1995

the land use change in the basin was obvious. The area of grassland and woodland increased by 5.33% and 3.63%

respectively. The cultivated land decreased by 6.92%. The dominant changes in land use types were conversion from cultivated land to forestland

grassland and construction land. In addition to the impact of rainfall

land use change was the major factor affecting the continuous decline of runoff. During the period of 2010-2016

the area of grassland and woodland increased by 19.93% and 5.25%

while the cultivated land and unused land decreased by 13.93% and 87.97%

respectively

indicating that land use change was the main reason for the significant decrease in runoff. In addition

the construction of Pingzhai reservoir in the Qianzhong water control project had an important impact on the reduction of runoff to a certain extent.[Conclusion] Land use change in the upper reaches of the Sancha River was closely related to the changes of runoff

which reduced watershed runoff.

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