干旱区生态环境知识资源中心(Arid): 中国藏北高寒生态遥感植被变化及成因分析

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	中国藏北高寒生态遥感植被变化及成因分析
其他题名	Vegetation Variations and Causes in Alpine Ecosystem of the Northern Tibet Plateau Based on Remote Sensing
	张佳华 1; 姚凤梅 2; 郑凌云 1
ISSN	0529-6579
出版年	2009
卷号	48 期号:5 页码:143-147
中文摘要	利用NOAA/AVHRR-NDVI遥感数据研究了近20年藏北高寒生态系统植被变化趋势,发现藏北植被覆盖呈现出东部高,西部低的态势;依次是农作区和森林区>高寒草甸>高寒草原>高寒荒漠草原.空间分布显示NDVI显著增加或减少的区域分布在地势比较低的东部和中部地区的森林区和高寒草甸区,在海拔较高的西部地区的高寒荒漠草原NDVI变化趋势处于轻微变化或无变化.分析造成植被变化的气候原因(温度、降水,风)和人为原因,认为不同区域植被动态变化的主导因素不同;藏北东部地区,植被变化受人类活动因素影响比较显著;中部地区,同期气候条件有所改善,植被覆盖呈增加趋势,年平均最低温度和降水对植被生长具有正效应,而风力和辐射减少引起该区植被蒸散下降也有利于植被生长.藏北地区西部为无人区,不受人类活动太大的影响,因而藏北西北部的植被变化可能更多的表现出藏北高原植被的自然变动.
英文摘要	The spatial and temporal variations of the vegetation were investigated in the in alpine ecosystem of the Northern Tibet Plateau(NTP) using NOAA/AVHRR NDVI satellite data with 8 km spatial resolution from 1981 to 2001.The results show that significant increase and decrease of VP-NDVI occurred in the central and eastern NTP.Weak VP-NDVI dynamic appeared in the western and northwestern NTP.The relationships between Vegetation Peak-Normalized Difference Vegetation Index(VP-NDVI) and climate variables(temperature,precipitation,wind speed) were analyzed in the NTP.An obviously negative correlation between VP-NDVI and evapotranspiration was found in sub-frigid,semi-arid and frigid-arid regions of the NTP because of the decline of wind speed and solar radiation.The annual minimum temperate and precipitation have positive effect on vegetation growth in this region.In temperate-humid,sub-frigid and sub-humid regions of the NTP,significant correlation between VP-NDVI and population indicates that human activities have adversely affected the grassland condition as was previously reported in the literature.Results from this research suggest that the alteration and degradation of the grassland in the lower altitude of the NTP over the last two decades of the 20th century are likely caused by variations of climate and anthropogenic activities.
中文关键词	藏北高寒生态 ; 植被动态 ; 遥感 ; 气候变化 ; 人类活动
英文关键词	NOAA/AVHRR alpine ecosystem of NTP vegetation variation remote sensing information NOAA-AVHRR climate change human activities
语种	中文
国家	中国
收录类别	CSCD
WOS类目	REMOTE SENSING
WOS研究方向	Remote Sensing
CSCD记录号	CSCD:3707813
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224630
作者单位	1.中国气象科学研究院, 北京 100081, 中国; 2.中国科学院研究生院, 北京 100049, 中国
推荐引用方式 GB/T 7714	张佳华,姚凤梅,郑凌云. 中国藏北高寒生态遥感植被变化及成因分析[J],2009,48(5):143-147.
APA	张佳华,姚凤梅,&郑凌云.(2009).中国藏北高寒生态遥感植被变化及成因分析.,48(5),143-147.
MLA	张佳华,et al."中国藏北高寒生态遥感植被变化及成因分析".48.5(2009):143-147.