【摘要】 基于2001-2013年山西省中分辨率成像光谱仪(MODIS)植被指数产品(MOD 13Q1)和气象数据(气温、降水量),利用斜率分析法、相关系数分析法等方法 ,研究近13年来植被指数(增强型植被指数EVI、归一化植被指数NDVI)的时空变化特征,以及植被覆盖变化对气候变化的响应。结果表明,年际变化方面,整体EVI和NDVI年均值显著增加,每个月均值也呈递增趋势,其中7月份的年际增长变化最为显著(EVI、NDVI的线性增长率分别为0.003 8和0.005 7);空间分布上,植被覆盖较茂密的地区主要分布在山区一带,植被稀疏区主要位于盆地附近;植被指数与年均降水量呈显著正相关,与年均气温整体上呈负相关,显著性并不明显,表明植被覆盖受降水变化影响较大,对其变化响应较强,受温度变化影响较小,呈弱响应关系。更多还原

【Abstract】 Based on MODIS vegetation index products(MOD 13Q1) from 2001 to 2013 and meteorological data(temperature,precipitation), we studied vegetation index(EVI, NDVI) of the spatial and temporal variations in the past 13 years in Shanxi and vegetation cover changes in response to climate change using slope analysis, correlation coefficient analysis and other statistical methods. The results showed that in interannual, the overall annual EVI and NDVI average increased significantly, and the monthly average in interannual also showed an increasing trend, in which the most significant changes grew in July(the linear slope of EVI and NDVI were 0.0038 and 0.0057); on the spatial distribution, the lush regions are mainly in the mountainous area, while the sparse regions are mainly located in the vicinity of the basin; significant positive correlations were found between vegetation index and average annual precipitation, while negative relationships were found for average annual temperature, with the unconspicuous significance, which indicated that vegetation cover was largely affected by changes of average annual precipitation,with a strong response, and less affected by temperature changes, with a weak response relationship.更多还原