[1]张艳芳,吴春玲,张宏运,等.黄河源区植被指数与干旱指数时空变化特征[J].山地学报,2017,(02):142-150.[doi:10.16089/j.cnki.1008-2786.000206]
 ZHANG Yanfang,WU Chunling,ZHANG Hongyun,et al.Dependency Relationship between NDVI and SPEI for Spatial-Temporal Variations in the Source Areas of the Yellow River[J].Mountain Research,2017,(02):142-150.[doi:10.16089/j.cnki.1008-2786.000206]
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黄河源区植被指数与干旱指数时空变化特征()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2017年02期
页码:
142-150
栏目:
山地生态环境
出版日期:
2017-03-30

文章信息/Info

Title:
Dependency Relationship between NDVI and SPEI for Spatial-Temporal Variations in the Source Areas of the Yellow River
文章编号:
1008-2786-(2017)2-142-09
作者:
张艳芳吴春玲张宏运王 姝
陕西师范大学 旅游与环境学院,西安 710119
Author(s):
ZHANG YanfangWU ChunlingZHANG HongyunWANG Shu
College of Tourism and Environment,Shaanxi Norm al University,Xi'an 710062
关键词:
黄河源区SPEINDVI时空变化
分类号:
Q948
DOI:
10.16089/j.cnki.1008-2786.000206
文献标志码:
A
摘要:
标准化降水蒸散发指数(SPEI)是评估气候变暖背景下区域干旱的重要指标。基于生态功能分区,利用MODIS-NDVI数据和SPEI指数,探讨2000—2014年黄河源区植被指数和干旱指数的年际变化、空间分布规律以及两者之间的相关关系。结果表明:(1)2000—2014年黄河源区NDVI和SPEI总体上均呈波动上升趋势,植被覆盖状况略有好转,干旱程度有所降低;(2)NDVI与SPEI变化趋势的空间分布特征大致相同,东南部区域总体呈减少趋势,西北部区域总体呈增加趋势;(3)黄河源区降水量是影响植被生长的主要因子,也是影响SPEI变化的主要条件。当0.3<NDVI<0.6时,SPEI对NDVI的影响较强,当NDVI>0.6时影响较小;(4)黄河源区大部分地区NDVI与SPEI呈正相关,其中呈显著正相关的区域分布在青根河生态区以及黄河源头生态区植被覆盖度较低区域;小部分地区由于受到人类活动的干扰,使NDVI与SPEI呈负相关或相关性较弱,其中呈显著负相关的区域在黄南草原生态区及周围草地退化、生物多样性敏感的区域。黄河源区干旱程度的下降对植被覆盖的增加有促进作用,为该区域的生态恢复提供了有利条件。

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备注/Memo

备注/Memo:
基金项目(Foundation item):国家自然科学基金项目(41371523)。[National Nature Science Foundation of China(41371523)]
作者简介(Biography):张艳芳(1969-),女,陕西省榆林市人,博士,副教授,主要从事水土资源评价、生态安全研究。[Zhang Yanfang(1969-),female, born in Yulin, Shaanxi Province, Ph.D., associate professor, mainly engaged in the study of water and soil resources evaluation and ecological security] E-mail: zhangyf@snnu.edu.cn
更新日期/Last Update: 2017-03-30