Spatial and Temporal Variations of Soil Erosion in Nanting River Basin

GU Zhijia; BAI Zhiwei; DUAN Xingwu; DING Jianhong; FENG Detai; SHI Xiaoning; HAN Xu

doi:10.13961/j.cnki.stbctb.2015.05.062

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Spatial and Temporal Variations of Soil Erosion in Nanting River Basin

- Spatial and Temporal Variations of Soil Erosion in Nanting River Basin
- Bulletin of Soiland Water Conservation Vol. 35, Issue 5, Pages: 334-339(2015)
- 作者机构：
  
  1. 云南大学国际河流与生态安全研究院,云南,昆明,650091
  2. 云南省水利水电科学研究院,云南,昆明,650228
  3. 云南省国际河流与跨境生态安全重点实验室,云南,昆明,650091
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2015.05.062
  CLC：
- Published：2015
- 稿件说明：
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GU Zhijia, BAI Zhiwei, DUAN Xingwu, et al. Spatial and Temporal Variations of Soil Erosion in Nanting River Basin[J]. Bulletin of Soiland Water Conservation, 2015, 35(5): 334-339.
DOI：

GU Zhijia, BAI Zhiwei, DUAN Xingwu, et al. Spatial and Temporal Variations of Soil Erosion in Nanting River Basin[J]. Bulletin of Soiland Water Conservation, 2015, 35(5): 334-339. DOI： 10.13961/j.cnki.stbctb.2015.05.062.

摘要

[目的

]

分析南汀河流域坡面土壤侵蚀的时空分异特征

为流域水土保持和边疆生态环境建设提供科学参考。[方法

]

基于通用土壤流失方程(USLE)

运用RS和GIS技术计算南汀河流域1990

2000及2010年3个时段的土壤侵蚀模数。[结果

]

3个时段内研究区侵蚀模数呈现先升后降的趋势

年均侵蚀模数从24.75 t/(hm

·a)升到30.05 t/(hm

·a)

然后降为25.87 t/(hm

·a)。3个时段内

流域内强烈侵蚀及其以上的侵蚀面积仅占总侵蚀面积的19.94%

但对流域总侵蚀量的贡献高达73.56%。1990-2000年

强烈及强烈以下侵蚀面积减少了1059.85 km

强烈侵蚀以上的侵蚀面积则增加了112.29 km

;2000-2010年

微度侵蚀面积有小幅增加

其余侵蚀等级的侵蚀面积都有所下降。当坡度小于20°时

侵蚀模数随着坡度的增加而增加

坡度超过20°后

侵蚀模数有降低的趋势;从海拔上看

高侵蚀模数区域主要位于海拔500~2000 m范围。[结论

]

流域内的土壤侵蚀治理已初见成效

但在局部地区

土壤侵蚀仍有加剧现象。

Abstract

[Objective] We aimed to analyze the spatial and temporal variations of soil erosion in Nanting river basin in order to provide the scientific basis for soil and water conservation and frontier ecological environment construction.[Methods] Based on the universal soil loss equation(USLE)

RS and GIS technologies were applied to estimate the soil erosion modulus in Nanting river basin in 1990

2000 and 2010.[Results] Erosion modulus showed an initial increasing trend and followed by a decreasing trend during the study period. The average annual erosion modulus increased from 24.75 t/(hm2·a) in 1990 to 30.05 t/(hm2·a) in 2000

and then decreased to 25.87 t/(hm2·a) in 2000. Although the intensive and extreme intensive erosions only accounted for 19.94% of the total erosion area

they contributed as much as 73.56% of the total amount of erosion in the study area. From 1990 to 2000

the moderate and light erosion areas were reduced by 1059.85 km2

while the extreme intensive erosion areas were increased by 112.29 km2. From 2000 to 2010

the erosion areas for all erosion intensities were decreased

except for the light erosion. The erosion modulus increased with the increase of slope when the slope was less than 20°

while it decreased with the increase of slope when the slope was more than 20°. High erosion modulus was mainly distributed in 500~2000 m.[Conclusion] Soil erosion control has achieved initial success in Nanting river basin

although intensified soil erosion still occurs in local areas.

关键词

Keywords

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