艾比湖流域NDVI变化及其与降水、温度的关系

doi:10.7522/j.issn.1000-694X.2013.00312

摘要/Abstract

摘要： 利用2000—2012年MODIS-NDVI数据,结合34个气象站同期的降水与温度数据,分析13年间艾比湖流域NDVI变化趋势及其对降水和平均温度变化的响应特征.结果表明:(1)13年间,艾比湖流域NDVI总体呈上升趋势,NDVI极显著(p<0.01)增加区和显著(p<0.05)增加区主要分布在核心绿洲及其边缘地区;NDVI变化不显著(p>0.05)区域占研究区总面积的64.25%;(2)降水与NDVI的显著和极显著线性相关区域分别占研究区的33.27%和2.66%,主要分布在温泉县、博乐市及托里县南部;温度与NDVI的显著和极显著线性相关区域分别占研究区的11.35%和0.30%,主要分布在博乐市以东区域;(3)从年际变化水平来看,偏相关系数和线性相关分析结果均表明,NDVI总体上与年降水量呈正相关,而与平均温度呈负相关,降水对NDVI的影响明显高于平均温度;从月际变化水平来看,艾比湖流域NDVI变化对降水的滞后期为一个月,而对于平均温度滞后现象则不明显,可能是NDVI时间尺度选择过大造成的;NDVI与月序列平均温度的相关系数明显高于与降水的相关系数,说明在月际水平上温度对植被生长的作用大于降水.

关键词: MODIS-NDVI, 降水, 平均温度, 艾比湖流域

Abstract: Precipitation and temperature are the two important climate elements and the main driving forces to the vegetation activity. The variation of precipitation and temperature will directly affect the conditions of vegetation growth. This paper, based on MODIS NDVI data from 2000 to 2012, and rainfall and temperature data in 34 weather stations at the same time, carried out the NDVI change trend and its responses to the temporal and spatial variations in precipitation and temperature. The result indicated that: In 13 years, the NDVI of the Ebinur Lake Basin rose. The NDVI increased significantly (p<0.05) and extremely significantly (p<0.01) in the core and the edge of the oasis area; the area with no changed NDVI (p>0.05) is 64.25%, accounted for nearly two-thirds of the total area. The area with significant and very significant linear correlation of precipitation and NDVI accounted for 33.27% and 2.66%, respectively, in the studied area, and they were mainly distribute in Wenquan, Bole and Southern of Toli. Whereas the area with significant and very significant linear correlation of temperature and NDVI accounted for 11.35% and 0.30%, respectively, in the studied area, and they were mainly distribute in the east of Bole. At the inter-annual variability level, the analysis of partial correlation coefficient and analysis of linear correlation all showed that: the NDVI generally positively correlated with the annual precipitation, while negatively correlated with the average temperature, and the precipitation effects on the NDVI were significantly higher than the average temperature. At the monthly variability level, the NDVI lagged behind the overall precipitation for a month, for the lagging of average temperature performance is not obvious, and it was likely to be caused by the selection of NDVI that the time scale was too large; the monthly sequence correlation coefficient of average temperature and the NDVI was obviously higher than that in sequence of the correlation of rainfall and NDVI, it showed that the month level on the growth of vegetation temperature is greater than the effect of precipitation.

Key words: MODIS-NDVI, precipitation, average temperature, Ebinur Lake Basin

中图分类号:

Q948.112

姜红涛, 塔西甫拉提·特依拜, 阿尔达克·克里木, 张飞, 买买提·沙吾提, 吴雪梅. 艾比湖流域NDVI变化及其与降水、温度的关系[J]. 中国沙漠, 2014, 34(6): 1678-1684.

Jiang Hongtao, Tashpolat·Tiyip, Ardak·Kelimu, Zhang Fei, Mamat·Sawut, Wu Xuemei. Responses of NDVI to the Variation of Precipitation and Temperature in the Ebinur Lake Basin[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(6): 1678-1684.

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