草业学报2012，Vol.21Issue(4)：224-235,12.
玛曲草原植被NDVI与气候和载畜量变化的关系分析
Study the change of NDVI and climate factors and carrying capacity and their correlation in Maqu County, Gansu
摘要
Abstract
The paper reports on a study conducted in Maqu County located in eastern Tibet Plateau from 1982 to 2005. It was focused on the change of NDVI, climate factors and carrying capacity and their correlation, as well as the time lag effect between NDVI and temperature and precipitation. The correlation coefficients between NDVI and temperature and precipitation over the same period and the effect of including data from a prior period were analyzed under 16 combinations of temperature or precipitation (4 time durations by 4 time lags). The annucal changes of NDVI in spring and summer were significantly increased and their increasing range were 0. 019/10 a and 0. 022/10 a respectively. The annual change of seasonal and annual temperature as well as annual accumulated temperature above 0℃ were significantly increased over the study period and their increasing range were 0. 5 - 0. 7℃ ,0. 6℃and 121. 5℃ respectively. The changes of seasonal and annual precipitation were not significantly different. The change of temperature in summer was steady but in spring and autumn it was variable. So too was the change of precipitation in four seasons. The correlation of monthly NDVI all the year round and the NDVI in spring and autumn in response to temperature at same period were significant positive or negative, and the value of correlation coefficient were 0. 84, 0. 77, -0. 52 and 0. 80 respectively. The correlation of average monthly NDVI every year in response to annual accumulated temperature above 0 ℃ and carrying capacity were significant positive, and the value of correlation coefficient were 0. 66 and 0. 45 respectively. The correlation of NDVI in response to precipitation in the current month and accumulated precipitation in two months prior (time durations: three months) were highly significant, the temperature in the current month and one month prior (time durations: two months) was also highly significant. By taking lag times into account we found significantly high correlations with the NDVI increase during the growing seasons. The increase of temperature in early growth stage (April) promoted vegetation growth. Generally precipitation later in the year had negative effects especially rains late in the growth stage of forage plants (August to September) as did high temperature at this time.关键词
青藏高原东缘/归一化植被指数/气温/降水/积温/时滞效应Key words
eastern Tibet Plateau/normal difference vegetation index/temperature/precipitation/accumulated temperature/time lag effect分类
农业科技引用本文复制引用
花立民..玛曲草原植被NDVI与气候和载畜量变化的关系分析[J].草业学报,2012,21(4):224-235,12.基金项目
农业部公益性行业科研项目(No.201003061)和草业生态系统重点实验室(甘肃农业大学)开放基金(CYZS-2011013)资助. （No.201003061）
