干旱区生态环境知识资源中心(Arid): 不同尺度视角下大敦煌NPP分布格局研究

Arid

	不同尺度视角下大敦煌NPP分布格局研究
其他题名	Distribution Pattern of NPP Based on the Transformation of Different Scales in Great Dun Huang
	刘春雨 1; 董晓峰 1; 刘英英 2
来源期刊	资源科学
ISSN	1007-7588
出版年	2014
卷号	36 期号:2 页码:406-412
中文摘要	利用2000-2010年大敦煌境内及周边地区的17个气象站点和MODIS数据，通过改进的光能利用率概念模型（CASA），反演了大敦煌NPP的空间格局，并从年尺度和月尺度上分析大敦煌NPP与气候变化的关系。研究表明：①2000-2010年间，大敦煌的NPP出现稀疏的小块状或条带状分布，平均NPP为55.89gC/（m~2?a）；②大敦煌年降雨量从东南（202.03mm）向西北（34.03mm）呈现递减的趋势，年均温从中间呈条带状分布的高值区（10.54℃）向南北两个方向递减形成低值区（4.27℃）；③以年为尺度，大敦煌的绿洲草原区和戈壁荒漠区与年降水量的关系比年均温密切；④以月为尺度，大敦煌NPP与月降水量和月均温的相关性比年尺度低，其原因是植被生长更依赖水热的共同作用，而与单一气候因子的相关性降低；绿洲草原区对降水量存在时滞与累积效应，戈壁荒漠区不存在时滞与累积效应。
英文摘要	Net primary productivity (NPP) is an important index of ecological environmental change and can be used as an indicator of climate change. Satellite images (moderate resolution imaging spectroradiometer)and ground-based observations of climatology at 17 sites in Great Dun Huang and surrounding areas were jointly used to improve the Carnegie-Ames-Stanford approach (CASA)model and estimate NPP in Great Dun Huang from 2000-2010. We found a clear spatial distribution pattern and discuss relationships between NPP values of oasis savannas and the Gobi Desert. Temporal and spatial patterns in NPP appearsmall blockorstrippedand annual NPP ranges from 0~790.67gCm~(-2)a~(-1) (mean value：55.89gCm~(-2)a~(-1)). Annual precipitation shows a decreasing trend,and ranges from the southeast of the study area at 202.03mm to the northwest at 34.03mm. The annual temperature ranges from the middle presentstrippedwith a high value area of 10.54°C to the two direction of north and south with a low value area of 4.27°C. The study area is mainly influence by annual precipitation,and it is the main control factor in Great Dun Huang at an annual scale. The analysis between NPP with precipitation and temperature shows that correlation with the monthly scale is lower than with the annual scale,indicating that vegetation growth within a month is more sensitive to the joint function of hydrothermal combination rather than either climate factor. Compared with the Gobi Desert,oasis savannas display a time lag and cumulative effects.
中文关键词	偏相关系数 ; 时滞与累积效应 ; 大敦煌
英文关键词	NPP coefficient of partial correlation NPP time lag and cumulative effect Great Dun Huang
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MULTIDISCIPLINARY SCIENCES
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5060679
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232300
作者单位	1.兰州大学资源环境学院, 兰州, 甘肃 730000, 中国; 2.兰州大学西部环境与气候变化研究院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	刘春雨,董晓峰,刘英英. 不同尺度视角下大敦煌NPP分布格局研究[J]. 兰州大学,2014,36(2):406-412.
APA	刘春雨,董晓峰,&刘英英.(2014).不同尺度视角下大敦煌NPP分布格局研究.资源科学,36(2),406-412.
MLA	刘春雨,et al."不同尺度视角下大敦煌NPP分布格局研究".资源科学 36.2(2014):406-412.