地球信息科学学报 ›› 2016, Vol. 18 ›› Issue (8): 1069-1076.doi: 10.3724/SP.J.1047.2016.01069

• 地理空间分析综合应用 • 上一篇    下一篇

三江源生态工程实施前后长江源区宏观生态状况变化分析

刘璐璐1,2(), 曹巍1, 邵全琴1,*()   

  1. 1. 中国科学院地理科学与资源研究所 陆地表层格局与模拟院重点实验室,北京 100101
    2. 中国科学院大学,北京 100049
  • 收稿日期:2015-08-24 修回日期:2015-11-16 出版日期:2016-08-10 发布日期:2016-08-10
  • 通讯作者: 邵全琴 E-mail:liull.11s@igsnrr.ac.cn;shaoqq@lreis.ac.cn
  • 作者简介:

    作者简介:刘璐璐(1988-),女,山东人,博士生,研究方向为GIS与生态信息。E-mail:liull.11s@igsnrr.ac.cn

  • 基金资助:
    国家自然科学基金面上项目(41571504);国家科技支撑计划项目(2013BAC03B04);三江源智慧生态畜牧业平台建设项目(2015-SF-A4-1);中国科学院特色研究所培育建设项目(TSYJS05);中国科学院科技服务网络计划项目(KFJ-EW-STS-005-04)

Change of Ecological Condition in the Headwater of the Yangtze River Before and After the Implementation of the Ecological Conservation and Construction Project

LIU Lulu1,2(), CAO Wei1, SHAO Quanqin1,*()   

  1. 1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-08-24 Revised:2015-11-16 Online:2016-08-10 Published:2016-08-10
  • Contact: SHAO Quanqin E-mail:liull.11s@igsnrr.ac.cn;shaoqq@lreis.ac.cn

摘要:

基于NDVI时空序列数据,利用GLOPEM-CEVSA模型,本文估算并分析了长江源区1997-2012年植被覆盖度及植被净初级生产力时空变化特征,并在此基础上评估了生态工程实施前、后长江源区宏观生态状况变化。结果表明:工程实施后,长江源区宏观生态状况显著好转,植被覆盖度及植被净初级生产力明显增加。从多年平均值来看,工程实施后,植被覆盖度好转区域面积占植被区总面积的72.10%,净初级生产力增加区域面积占植被区总面积的73.82%;从变化趋势来看,植被覆盖度好转区域面积净增加13.02%,植被净初级生产力好转区域面积净增加24.62%。工程实施前后相比,各流域宏观生态状况恢复程度具有差异,其中楚玛尔河源头植被覆盖度上升最明显,通天河流域植被净初级生产力上升最明显。长江源区宏观生态状况的好转受益于气候的湿润化及生态工程的共同影响,若要全面有效改善仍需持续努力。

关键词: 长江源区, 植被覆盖度, 植被净初级生产力, 生态保护和建设工程, 生态成效

Abstract:

The positive effects of ecological conservation and construction projects on ecosystem restoration were obvious in the headwater of the Yangtze River. This paper estimated the vegetation coverage (VC) and net primary productivity (NPP) during the period of 1997-2012 in this region by applying the GLOPEM-CEVSA model and time series Normalized Difference Vegetation Index (NDVI) dataset. Then, the changes of ecological conditions before and after the implementation of projects were assessed. The results showed that the ecological conditions in the headwater of the Yangtze River were significantly improved after implementing the projects, with obviously increased VC and NPP. From the annual average levels of VC and NPP, we can see that by comparing the conditions before and after implementing the projects, the area with increased VC and NPP had accounted for 72.10% and 73.82% of the total area respectively. And by looking into the variation trends, we can also see that the area with restored VC and NPP had increased by 13.02% and 24.62% respectively. The vegetation restorations were varied in different watersheds. Compared the conditions before and after implementing the project, the restoration of VC in the headwater of the Chumaer River showed an obvious improvement and NPP had increased significantly in the Tongtian River watershed. The restoration of the ecological condition in the headwater of the Yangtze River was benefited from the combined effects of the humid climate and the ecological projects, while continuous efforts are still needed to improve the ecological environment sustainably and effectively in the future.

Key words: the headwater of the Yangtze River, vegetation coverage, net primary productivity, ecological projects, ecological effect