摘要
利用1999—2009年延安市的SPOT-NDVI数据,并结合1998年10月至2009年12月的气温数据,从年、季、月3种不同时间尺度分析了近11年延安地区植被指数的变化规律,并用相关分析的方法研究了植被指数变化与气温之间的关系。研究结果表明:1999—2009年,年均NDVI整体呈显著上升趋势,月均NDVI与同期气温、前1个月气温、前2个月气温、前3个月气温的相关系数分别为0.851(p<0.01)、0.898(<0.01)、0.695(p<0.01)、0.225(p<0.05),表明前3个月的气温对植被指数的变化均有很大的影响,并说明延安地区植被指数对气温变化的响应存在明显的滞后现象,尤以滞后1个月最为明显。
In this paper,using SPOT-NDVI data from 1999 to 2009 in Yan’an area,and combining the temperature data during October,1998 to December,2009,the variation regulation of vegetation index in Yan’an area in recent 11 years was analyzed from annual,monthly,seasonal scales,and the relationship between the vegetation index changes and the temperature was studied with the method of correlation analysis in response,aiming to reveal the response that vegetation in this area to global climate change.The results showed that,the average annual NDVI from 1999 to 2009 in Yan’an area showed an overall significant upward trend.The correlation coefficients of monthly average NDVI and the temperature of the same period of last year,one month previously,two months previously,three months previously were 0.851（p〈0.01）,0.898（p〈0.01）,0.695（p〈0.01）and 0.225（p〈0.05）respectively.This indicates that the response of vegetation index in Yan’an area to the temperature variation lag obviously,especially in the most obvious lag one month.
出处
《现代农业科技》
2014年第17期269-272,共4页
Modern Agricultural Science and Technology
关键词
植被
气温变化
响应
陕西延安
NDVI
vegetation
NDVI
temperature variation
response
Yan＆#39
an Shaanxi
