Spatiotemporal changes of vegetation and their responses to temperature and precipitation in upper Shiyang river basin
Spatiotemporal changes of vegetation and their responses to temperature and precipitation in upper Shiyang river basin
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石羊河流域植被时空变化及其对气温和降水的响应
DOI：
10.1016/j.asr.2017.05.033
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发表时间：
2017-09
影响因子：
2.6
通讯作者：
Huanhua Peng
中科院分区：
文献类型：
--
作者：
Zhiguang Tang;Jinhui Ma;Huanhua Peng
石羊河流域是我国西北地区典型的干旱内陆河流域，近几十年来气候变化明显，生态环境恶化。石羊河流域植被主要集中在上游，对流域生态环境起着重要作用。然而，该地区的植被如何响应这种气候变化的了解甚少。利用1999 - 2013年SPOT植被归一化植被指数（NDVI）和气候数据，研究了石羊河上游流域植被生长的时空变化及其对气候变化的响应。结果表明，81.3%的研究区的植被指数呈上升趋势。研究区生长季（3 - 11月）的平均NDVI增长率为7.75%，春季（3 - 5月）为11.75%，夏季（6 - 8月）为9.62%，秋季（9 - 11月）为5.98%。春季和秋季植被指数的增加表明研究区植被的生长季节有所延长。气候变化对植被生长的影响因植被类型和季节而异，表现出较大的时空异质性。与温度相比，降水是影响植被年际变化的主导气候因子。如果研究区气温和降水持续增加，植被生长对气温和降水的敏感性可能下降。
The Shiyang river basin is a typical arid inland river basin in northwestern China, where significant climate change and ecological environment deterioration has been observed over the past several decades. The vegetation in Shiyang river basin is mostly concentrated in its upstream, and plays an important role in ecological environment of this watershed. However, how the regional vegetation responds to such climatic change is poorly understood. To address this question, the spatiotemporal changes of vegetation growth in upper Shiyang river basin together with their responses to climate changes were investigated using SPOT VEGETATION Normalized Difference Vegetation Index (NDVI) and climate datasets from 1999 to 2013. Results reveal that about 81.3% of the study area shows an increasing trend in NDVI. The average NDVI of the study area increases at rates of 7.75% for the growing season (March–November), 11.75% for spring (March–May), 9.62% for summer (June–August), and 5.98% for autumn (September–November) over the study period. The increase of NDVI in spring and autumn suggests the growing season of the vegetation in this study area has been prolonged. The effects of climate changes on vegetation growth vary with the types of vegetation and seasons, which shows a large spatial and temporal heterogeneity. As compared with temperature, precipitation is the dominant climatic factor affecting the interannual variations of vegetation. If the temperature and precipitation continue to increase in the study area, the sensitivity of vegetation growth to temperature and precipitation may decline.
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影响因子：
64.8
作者：
Schimel, DS;House, JI;Wirth, C
通讯作者：
Wirth, C
影响因子：
13.5
作者：
B. Duchemin;P. Maisongrande
通讯作者：
B. Duchemin;P. Maisongrande
DOI：
10.1109/igarss.2003.1294413
发表时间：
2003-07
期刊：
IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477)
影响因子：
--
作者：
Zhen Li;Fuli Yan;Xiangtao Fan
通讯作者：
Zhen Li;Fuli Yan;Xiangtao Fan
影响因子：
13.5
作者：
Fensholt, Rasmus;Rasmussen, Kjeld;Mbow, Cheikh
通讯作者：
Mbow, Cheikh
DOI：
--
发表时间：
2003
期刊：
Journal of Glaciology and Geocryology
影响因子：
--
作者：
M. Ming
通讯作者：
M. Ming