Evaluation of Ecosystem Degradation Threat and Study of Spatial Distribution in the Upper Reaches of the Changjiang River based on PSDR Framework
Received date: 2012-06-25
Request revised date: 2012-11-02
Online published: 2013-02-20
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In this article, the upper reaches of the Changjiang River was chosen as the study region, RS and GIS technologies were adopted and the " Pressure - State - Degradation - Response " (PSDR) theoretic frame and model was designed to evaluate the ecosystem (forest, grassland, farmland, wetland) degradation threat in a large scale, and the spatial distribution pattern of degradation station in detail was analyzed. It was shown by the results that the ecosystem degradation threat level of the upper reaches of the Changjiang River was overall under a serious condition, 74.54% of the area of the whole ecosystem was at least in a middle-threat level. Of which, the region of extreme threat accounted for 18.72%, 25.59% of the region was highly threatened, 30.22% got moderate threat, the lightly threat region accounted for 17.32% and 8.14% for slightly threat region. The most serious regions of the ecosystem degradation threat of the upper reaches of the Changjiang River were mainly located in Golmud City, Zhiduo County, Zaduo County and Yushu County of Qinghai Province, Mili Tibetan Autonomous County, Kangding, Wenchuan, Beichuan, Yajiang and Maerkang County of Sichuan Province, Shangri-La County and Weixi Lisu Autonomous County of Yunnan Province, Diebu County, Wen County, Zhouqu County of Gansu Province, Shennongjia area, Wushan, Badong, Xingshan, Zigui County of Hubei Province and Dianjiang, Liangping, Dazu, Tongnan County of Chongqing City.
REN Ping , CHENG Wu-xue , HONG Bu-ting , ZHOU Jie-ming . Evaluation of Ecosystem Degradation Threat and Study of Spatial Distribution in the Upper Reaches of the Changjiang River based on PSDR Framework[J]. SCIENTIA GEOGRAPHICA SINICA, 2013 , 33(2) : 189 -194 . DOI: 10.13249/j.cnki.sgs.2013.02.189
Fig.1 Evaluation theory frame of ecosystem degradation threat based on PSDR framework图1 基于PSDR的生态系统退化威胁评价理论框架 |
Table 1 The evaluation index system of the upper reaches of the Changjiang River's ecosystem degradation threat表1 长江上游生态系统退化威胁评价指标体系 |
长江上游 生态系统 退化威胁 评价指标 结构体系 | 森林生态系统 | 状态指标 | 土壤侵蚀度 |
---|---|---|---|
NDVI指数 | |||
生物多样性指数 | |||
生境质量指标 | |||
压力指标 | 人口密度 | ||
生境退化指标 | |||
农田生态系统 | 状态指标 | 土壤侵蚀度 | |
土壤厚度 | |||
压力指标 | 人口密度 | ||
化肥施用量 | |||
草地生态系统 | 状态指标 | 土壤侵蚀度 | |
NDVI指数 | |||
生物多样性指数 | |||
生境质量指标 | |||
压力指标 | 人口密度 | ||
产草量 | |||
生境退化指标 | |||
湿地生态系统 | 状态指标 | NDVI指数 | |
生物多样性指数 | |||
生境质量指标 | |||
压力指标 | 人口密度 | ||
生境退化指标 |
Fig.2 Classified evaluation of degradation threat in forest ecosystem图2 森林生态系统退化威胁分级评价 |
Fig.3 Classified evaluation of degradation threat in grassland ecosystem图3 草地生态系统退化威胁分级评价 |
Fig.4 Classified evaluation of degradation threat in farmland ecosystem图4 农田生态系统退化威胁分级评价 |
Fig.5 Classified evaluation of degradation threat in wetland ecosystem图5 湿地生态系统退化威胁分级评价 |
Fig.6 Classified evaluation of ecosystem degradation threatlevel of the upper reaches of the Changjiang River图6 长江上游生态系统退化威胁程度分级评价 |
The authors have declared that no competing interests exist.
[1] |
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[2] |
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[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
|
[11] |
|
[12] |
|
[13] |
|
[14] |
|
[15] |
|
[16] |
|
[17] |
|
[18] |
|
[19] |
|
[20] |
|
[21] |
|
[22] |
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