干旱区生态环境知识资源中心(Arid): 西北地区NDVI对水热条件年内变化的响应及其空间特征

Arid

	西北地区NDVI对水热条件年内变化的响应及其空间特征
其他题名	Intra-Annual Response of NDVI to Changes in Temperature and Precipitation and Its Spatial Characteristics in Northwest China
	张翀 1; 任志远 1; 袁鑫 2
来源期刊	资源科学
ISSN	1007-7588
出版年	2011
卷号	33 期号:12 页码:2356-2361
中文摘要	利用西北地区1982年-2006年日均温与降水数据和GIMMS-NDVI数据，以时滞互相关法为基础，通过生态区划和植被类型两个层面分析了水热条件的季向变化同半月NDVI变化之间的相关关系，分析结果表明：①植被覆盖较好且海拔较低的山地区以及河流沿线的NDVI与气温、降水的相关程度相对较高，响应也较快，而盆地以及海拔较高的高原或山地区的相关程度相对较低且响应时间较长，初步判定是水热条件好的区域相关程度高且响应迅速，相反水热条件差的区域相关程度低且响应迟缓。进一步以西北地区生态地理区划分析西北地区水热状况对NDVI变化的影响，得出≥10℃积温和降水量大的地区NDVI与气温、降水的相关程度较大且响应快，相反则相关程度较小且响应慢，并且在半月均温和半月平均降水的共同作用下影响半月NDVI平均值的变化；②气温和降水变化对植被NDVI的影响程度从大到小依次为针叶林、灌丛和草原、草甸和草本沼泽、阔叶林与荒漠植被，即由东、西分别向荒漠植被，相关性逐渐减小。某一类型的植被的生长对气温的要求高，则这类植被与气温的相关程度高且响应快，相反植被的生长对气温的要求低，则这类植被与气温的相关程度则低且响应慢，对于降水也是如此。
英文摘要	Reducing human disturbance to natural systems is of importance in studying the relationships between vegetation and climate. Northwest China, as one of a few extensive regions with increasing human disturbance, provides an ideal region for examining response of natural vegetation cover to water/thermal conditions. Combined with daily mean temperature and precipitation data and 15-day NDVI of GIMMS VGT from 1982 through 2006, the lag cross-correlation method was used to analyze temporal and spatial characteristics of the relationships between water/thermal climate elements and vegetation cover. Results show that: 1) correlation of NDVI with temperature and precipitation was relatively strong, with the response being faster over regions of higher vegetation cover, low-altitude mountains, and along rivers. There was low correlation across basins, high-altitude plateau, and mountainous areas, with the time of response being longer. There was low correlation and a slow response over areas with less water and heat. NDVI showed a greater correlation and faster response to accumulated temperature (≥ 10℃) and precipitation; 2) The degree of influence of temperature and precipitation on NDVI in descending order was coniferous forest, shrub and grassland, meadow and herbaceous swamp, hardwood forest, and desert vegetation, distributed generally from east and west to desert vegetation showing decreasing correlation. A certain type of vegetation whose growth requires a higher temperature showed a faster response. On the contrary, vegetation whose growth depends on low temperature showed a slow response. This rule can also be applied to precipitation; 3) Requirement on water and heat for different vegetation types in descending order was coniferous forest, shrub and grassland, meadow and herbaceous swamp, hardwood forest, and the desert vegetation.
中文关键词	水热条件 ; 滞后效应 ; 相关性 ; 西北地区
英文关键词	NDVI NDVI Water and heat conditions Hysteresis effect Correlation Northwest China
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:4397456
来源机构	陕西师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227671
作者单位	1.陕西师范大学旅游与环境学院, 西安, 陕西 710062, 中国; 2.西安外国语大学旅游学院, 西安, 陕西 710128, 中国
推荐引用方式 GB/T 7714	张翀,任志远,袁鑫. 西北地区NDVI对水热条件年内变化的响应及其空间特征[J]. 陕西师范大学,2011,33(12):2356-2361.
APA	张翀,任志远,&袁鑫.(2011).西北地区NDVI对水热条件年内变化的响应及其空间特征.资源科学,33(12),2356-2361.
MLA	张翀,et al."西北地区NDVI对水热条件年内变化的响应及其空间特征".资源科学 33.12(2011):2356-2361.