2005—2018年浙江省植被生长季NDVI时空变化及其对气候因子的响应

Spatial-temporal variation of NDVI in vegetation growing season and its response to climate factors in Zhejiang Province from 2005 to 2018

基于MODIS MOD 13Q1数据,通过趋势分析和相关分析研究了浙江省2005—2018年植被生长季归一化差异植被指数(NDVI)的时空动态变化规律及其与气候因子的关系。结果表明,2005—2018年研究区植被覆盖度整体较好,高覆盖区域多在山地;浙江省生长季NDVI多年均值为0.6541;生长季NDVI年际变化呈极显著上升趋势(P<0.01),年均增速为0.0016,研究区NDVI显著增加的区域面积达23.1%(P<0.05);全省植被覆盖变化程度稳定,低波动(CV≤0.05)和较低波动(0.05<CV≤0.10)区域面积达85.8%。相关分析结合多元回归分析发现,气温与生长季NDVI呈极显著正相关(P<0.01),为主要影响气候因子;生长季中期植被对气温和降水量的响应更为敏感。

Based on MODIS MOD 13Q1 data,the spatial and temporal dynamics of normalized difference vegetation index(NDVI)and its relationship with climate factors during the growing season in Zhejiang Province from 2005 to 2018 were explored through trend analysis and correlation analysis.The results showed that the vegetation coverage in the study area was relatively good from 2005 to 2018,and the areas with high vegetation coverage were mostly in mountainous areas.The multi-year average NDVI in Zhejiang grow⁃ing season was 0.6541.The interannual variation of NDVI in the growing season showed an extremely significant increase(P<0.01),with an average annual growth rate of 0.0016,and the area of the study area with a significant increase of NDVI reached 23.1%(P<0.05).The vegetation cover of the whole province was stable,and the area of low fluctuation(CV≤0.05)and relatively low fluctuation(0.05<CV≤0.10)reached 85.8%.The results of correlation analysis and multiple regression analysis showed that air temperature was significantly positively correlated with NDVI(P<0.01)in the growing period,which was the main influencing factor,and the response of vegetation to temperature and precipitation was more sensitive in the middle growing period.