近14年来柴达木盆地NDVI时空变化及其影响因素

生态学杂志

近14年来柴达木盆地NDVI时空变化及其影响因素

王林林,刘普幸^**,王允

（西北师范大学地理与环境科学学院，兰州 730070）

出版日期:2015-06-10 发布日期:2015-06-10

Spatial and temporal variations of NDVI and its influencing factors in Qaidam Basin in the last 14 years.

WANG Lin-lin, LIU Pu-xing^**, WANG Yun

(College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China)

Online:2015-06-10 Published:2015-06-10

摘要/Abstract

摘要：

利用MODIS/NDVI数据分析了柴达木盆地2000—2013年植被NDVI季节时空变化及其驱动力因子，结果表明：近14年来，研究区年均、季节NDVI均呈增加趋势，其中以春季增加范围最大，其次为夏季和年均，秋季最小。不同高程NDVI、NDVI变化趋势（θ_slope)差异较大，分别在海拔3750和3550 m时达到最大，当低于这个高度时，二者均随海拔升高而增大，反之则减小。相关分析表明，春、夏、秋季NDVI分别与气温、降水、潜在蒸散量呈正相关，正相关面积分别占总植被区的81.96%、96.94%和76.54%；年均NDVI对降水最为敏感，与其呈正相关的面积为91.03%。此外，春、夏两季NDVI对气温和降水的滞后效应突出，并以冬季降水、最低气温对来年春季植被生长影响最显著，春季降水则对夏季植被生长贡献最大。除自然因素外，农作物播种面积、出栏率等人类活动也是柴达木盆地植被NDVI变化的重要因子。

关键词: 农用地, 土地利用集约化, 时空格局\ 物质流分析, 可持续集约化

Abstract: In this paper, the spatiotemporal variation of vegetation NDVI in Qaidam Basin and its influencing factors were analyzed by using MODIS/NDVI data during 2000-2013. The results showed that in the last 14 years, annual average and seasonal NDVI all showed an increasing trend, and the area of increased trend in spring was the largest, followed by summer, annual average and autumn. Differences in NDVI and NDVI change trend (θ_slope) were obvious among different elevations, with the maximum values found at elevations of 3750 and 3550 m, respectively. NDVI and θ_slope increased with the elevation when it was lower than 3750 and 3550 m respectively, and vice versa. Correlation analysis indicated that the relationships of the NDVI in spring, summer and autumn with temperature, precipitation and potential evapotranspiration were positive, and the corresponding area with positive correlation accounted for 81.96%, 96.94% and 76.54% of the total vegetation area, respectively. The annual average NDVI was most sensitive to precipitation, and 91.03% of the total vegetation area was positively related with precipitation. In addition, the lag effect of spring and summer NDVI in response to temperature and precipitation was obvious; the precipitation and extremely low temperature in winter affected most the vegetation growth in the coming spring, while the precipitation in spring had a great contribution to vegetation growth in summer. In addition to the natural factors, human activities such as crop planting area and the marketing rate of fattened stock also were important factors affecting NDVI in Qaidam Basin.

Key words: land use intensification, sustainable intensification, agricultural land, spatial-temporal pattern, material flow analysis.

王林林,刘普幸**,王允. 近14年来柴达木盆地NDVI时空变化及其影响因素[J]. 生态学杂志.

WANG Lin-lin, LIU Pu-xing**, WANG Yun. Spatial and temporal variations of NDVI and its influencing factors in Qaidam Basin in the last 14 years.[J]. cje.