Vegetation Changes Around Ertan Reservoir in Yalongjiang River

LU Xin; ZHAO Hongli; YANG Shuwen; JIANG Yunzhong; HUANG Yanyan

doi:10.13961/j.cnki.stbctb.2016.03.027

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Vegetation Changes Around Ertan Reservoir in Yalongjiang River

- Vegetation Changes Around Ertan Reservoir in Yalongjiang River
- Bulletin of Soiland Water Conservation Vol. 36, Issue 3, Pages: 148-151(2016)
- 作者机构：
  
  1. 兰州交通大学测绘与地理信息学院,甘肃,兰州,730070
  2. 中国水利水电科学研究院,北京,100038
  3. 甘肃省地理国情监测工程实验室,甘肃,兰州,730070
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2016.03.027
  CLC：
- Published：2016
- 稿件说明：
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LU Xin, ZHAO Hongli, YANG Shuwen, et al. Vegetation Changes Around Ertan Reservoir in Yalongjiang River[J]. Bulletin of Soiland Water Conservation, 2016, 36(3): 148-151.
DOI：

LU Xin, ZHAO Hongli, YANG Shuwen, et al. Vegetation Changes Around Ertan Reservoir in Yalongjiang River[J]. Bulletin of Soiland Water Conservation, 2016, 36(3): 148-151. DOI： 10.13961/j.cnki.stbctb.2016.03.027.

摘要

［目的］定量研究二滩水库蓄水以后库区周边植被的变化规律，为水库蓄水对周围边植被生长变化的影响研究提供依据。［方法］以遥感影像为试验数据，基于归一化植被指数的像元分解模型对研究区1999-2014年每年11月份的植被覆盖度进行估算，并依据土壤侵蚀强度分类分级标准对估算结果进行分级，通过波段运算结合阈值分割对植被覆盖状况变化较为明显的区域进行检测。［结果］自1999-2014年，研究区整体植被覆盖状况逐年变好，主要表现为高覆盖度区域面积逐年增大；局部地区受到人类活动、土壤侵蚀、耕地以及滑坡的影响植被覆盖度降低，约占总面积的19.5%；植被覆盖状况显著变好的区域约占总面积的39.8%，主要集中在距离水库较近的区域。［结论］二滩水库蓄水改善了库区周边植被的生长条件，植被覆盖状况整体逐年变好。

Abstract

[Objective] To study the changes in vegetation coverage around Ertan reservoir when it is filled with water

in order to provide the basis for assessing the impact of reservoir filling on vegetation growth surround the reservoir.[Methods] We used the dimidiate pixel model to predict the vegetation coverage of the study area in each November from 1999 to 2014 with the Landsat TM and environmental CCD images as the information sources. We then detected areas with obvious changes in vegetation cover through waveband operation and threshold segmentation.[Results] From 1999 to 2014

the vegetation cover in the study area increased year after year

and the high coverage area expanded greatly. However

the vegetation cover decreased in some areas due to human activities

soil erosion

farmland and landslide

which accounted for 19.5% of the total area; the region with obvious increase in vegetation cover accounted for about 39.8% of the total area

mainly concentrated areas near to the reservoir.[Conclusion] The Ertan reservoir had improved the growth of vegetation around

and the vegetation cover has increased year by year as a whole.

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references

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