Evolution and Causes of Vegetation and Wind Erosion at Reservoir Edge in Arid Sandstorm Area

Zhang Xiaohong; He Youhua; Hu Yanting

doi:10.13961/j.cnki.stbctb.2020.06.001

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Evolution and Causes of Vegetation and Wind Erosion at Reservoir Edge in Arid Sandstorm Area

- Evolution and Causes of Vegetation and Wind Erosion at Reservoir Edge in Arid Sandstorm Area
- Bulletin of Soiland Water Conservation Vol. 40, Issue 6, Pages: 1-7(2020)
- 作者机构：
  
  1. 甘肃省水土保持科学研究所,甘肃,兰州,730020
  2. 甘肃农业大学林学院,甘肃,兰州,730070
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.06.001
  CLC： Q948;S157.1
- Published：2020
- 稿件说明：
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Zhang Xiaohong, He Youhua, Hu Yanting. Evolution and Causes of Vegetation and Wind Erosion at Reservoir Edge in Arid Sandstorm Area[J]. Bulletin of Soiland Water Conservation, 2020, 40(6): 1-7.
DOI：

Zhang Xiaohong, He Youhua, Hu Yanting. Evolution and Causes of Vegetation and Wind Erosion at Reservoir Edge in Arid Sandstorm Area[J]. Bulletin of Soiland Water Conservation, 2020, 40(6): 1-7. DOI： 10.13961/j.cnki.stbctb.2020.06.001.

摘要

[目的] 对干旱风沙区水库边缘植被覆盖度和土壤风力侵蚀的动态变化及其成因进行分析，为该库区风沙危害的防治提供依据。[方法] 基于Landsat影像使用像元二分模型计算植被覆盖度，运用定性与定量相结合的方法，研究甘肃省瓜州县桥子水库边缘植被变化和风力侵蚀状况。[结果] 2006，2011，2018年植被覆盖度分别为0.15，0.13和0.35，水库边缘的植被呈先减后增的趋势，其生长有远离水库的趋势。2006-2011年桥子库群周边环境变化剧烈，2011-2018年植被退化速度减缓。研究区强烈以上侵蚀面积比例仍较大（50%以上）。[结论] 研究区植被和侵蚀变化的原因除了气候等自然因素外，地下水补给量减少，水位降低，超生态负荷扩大绿洲，不合理的种植业结构、耕作方式及牧业发展等人为因素加速了天然植被退化和局部侵蚀，而采取的草场封育、固沙造林等治理和修复措施在一定程度上延缓这一进程。建议采取生态引水、补给地下水、发展节水农业、禁垦禁牧、调整产业结构、恢复植被等抢救性措施和预防保护治理措施，以维护绿洲的持久稳定。

Abstract

[Objective] The dynamic changes and causes of vegetation coverage and wind erosion at the edge of the reservoir in arid sandstorm region were analyzed in order to provide a basis for the prevention and control of sandstorm hazards in the reservoir area.[Methods] Taking Qiaozi reservoir at Guazhou County

Gansu Province as a study area

landsat images of the edge of Qiaozi reservoir was collected

and the pixel dichotomy model was used to calculate the vegetation coverage in the arid sandstorm area. Both qualitative and quantitative methods were used to evaluate the changes of vegetation edge and wind erosion.[Results] The annual average values of vegetation coverage in 2006

2011

and 2018 were 0.15

0.13

and 0.35

respectively. The vegetation at the edge of the reservoir decreased first and then increased

and tended to grow away from the reservoir

and the change of vegetation coverage from 2006 to 2011 was higher than that from 2011-2018. The severe erosion area still accounted for a large proportion (>50%).[Conclusion] In addition to climate

the reduction of groundwater recharge

the decrease of water level

the expansion of oasis beyond ecological load

unreasonable planting

inadequate farming methods and animal husbandry development have accelerated natural vegetation degradation and local erosion. The adoption of grassland enclosure

sand fixation and afforestation and other management and restoration measures have delayed this process to a certain extent. It is suggested that ecological water diversion

groundwater replenishment

development of water-saving agriculture

reclamation and grazing prohibition

adjustment of industrial structure

restoration of vegetation and other rescue measures as well as prevention

protection and control measures should be taken to maintain the lasting stability of the oasis.

关键词

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