干旱区生态环境知识资源中心(Arid): 祁连山草地植被NDVI变化及其对气温降水的旬响应特征

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	祁连山草地植被NDVI变化及其对气温降水的旬响应特征
其他题名	Variation in Grassland Vegetation NDVI and Its Ten-Day Response to Temperature and Precipitation in the Qilian Mountains
	戴声佩; 张勃; 王强; 马中华; 邹悦; 张亚宁
来源期刊	资源科学
ISSN	1007-7588
出版年	2010
卷号	32 期号:9 页码:1769-1776
中文摘要	本文利用SPOT VGT-NDVI数据和旬气温、降水数据, 分析了祁连山草地植被NDVI时空变化趋势及其对气温、降水的旬响应特征. 结果表明: ①1999年-2007年祁连山草地植被NDVI呈缓慢增加趋势. 典型草原和平原草地植被年均NDVI和生长季NDVI增加速率高于高寒草甸草地和沙漠草地. 祁连山草地植被NDVI增加和减少的面积分别为6 9776km~2和1 5928km~2, 植被NDVI增加的区域分布在冷龙岭、拉脊山、大通山、达坂山、青海南山、走廊南山、托来山、托来南山等地区, 减少的区域分布在乌鞘岭、大通河、石羊河、黑河、北大河、疏勒河等河流河谷以及青海湖周边地区; ②祁连山草地植被NDVI年内月和旬变化曲线均呈单峰型; ③祁连山地区气温变化对草地植被 NDVI的影响强于降水, 气温、降水与草地植被NDVI的最大相关性滞后期都为2旬左右. 春季和秋季NDVI对气温和降水响应的滞后期较短, 而夏季响应滞后期较长; ④气温是影响典型草原生长的主要因素, 夏季降水是影响植被生长期内植被生长的重要因子. 温度是高寒草甸草地生长的限制因子, 而降水量则是沙漠草地、平原草地的生长限制因子
英文摘要	The Qilian Mountains is an important ecological and hydrological zone in Northwestern China,a critical forest-steppe ecosystem and wildlife conservation area,as well as the water sources of inland rivers and the Hexi oasis, such as the Heihe River, Shiyang River, Shule River and Zhangye Oasis, Linze Oasis, Gaotai Oasis, and Shandan Oasis. Examining the vegetation dynamics and environmental changes over this region plays a critical role in studying the environment and climate in China. This paper explores the vegetation dynamics and its relationship with major climatic factors in the Qilian Mountains using SPOT-4 VEGETATION NDVI datasets at 1 km spatial resolution and ten-day temperature and precipitation datasets between 1999 and 2007. Results showed that:1)the grassland vegetation NDVI has been increased in the Qilian Mountains since 1999.The increase rate of yearly average NDVI and growing season NDVI in typical steppe and plain grassland was found to be higher than that in the alpine meadow and desert grassland. The increased and reduced area was estimated to be 69776 km2 and 15 928 km2, respectively. The grassland vegetation NDVI in the Lenglong Ridge, Laji Mt., Datong Mt., Daban Mt., South Qinghai Mt., Zongwulong Mt., Tuolai Mt., and South Tuolai Mt.increased. By contrast, the grassland vegetation NDVI decreased in the Wushao Ridge, Datong River, Shiyang River, Hei River, Beida River, Shule River and the surrounding areas of Qinghai Lake;2)the grassland vegetation NDVI with a single peak curve during the year changed across the Qilian Mountains;it generally reached maximum in July or August. One reason for this phenomenon could be that the precipitation and temperature were both suitable for vegetation growth in July or August,so the NDVI reached maximum. The other reasons could be explained by the grassland in the brown phase from October to February and turning green in March or April. To that end, the vegetation grew slowly and the NDVI tended to be low;3)in the Qilian Mountains, response of grassland vegetation NDVI to the variation of temperature was greater than to that of precipitation. Grassland vegetation NDVI showed the strongest response to the variations in temperature and precipitation within a lag of about 20 days. The response of vegetation NDVI to temperature and precipitation peaked in autumn, and the lag time was longer in summer;and 4)temperature was a major factor affecting the growth of typical steppe, and summer precipitation was found to be an important factor affecting vegetation during the vegetation growth. Temperature was a constraint for alpine meadow grass growth, while precipitation could be a limiting factor for the growth of the desert grassland and plain grassland
中文关键词	草地 ; 气温 ; 降水 ; 祁连山
英文关键词	SPOT NDVI SPOT NDVI Grassland Temperature Precipitation Qilian Mountains
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENERGY FUELS
WOS研究方向	Energy & Fuels
CSCD记录号	CSCD:4051296
来源机构	西北师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226121
作者单位	西北师范大学地理与环境科学学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	戴声佩,张勃,王强,等. 祁连山草地植被NDVI变化及其对气温降水的旬响应特征[J]. 西北师范大学,2010,32(9):1769-1776.
APA	戴声佩,张勃,王强,马中华,邹悦,&张亚宁.(2010).祁连山草地植被NDVI变化及其对气温降水的旬响应特征.资源科学,32(9),1769-1776.
MLA	戴声佩,et al."祁连山草地植被NDVI变化及其对气温降水的旬响应特征".资源科学 32.9(2010):1769-1776.