1982-2015年山西省忻州市植被覆盖变化与气候因子的相关性分析

Correlation Analysis of Vegetation Cover Change and Climate Factors in Xinzhou City of Shanxi Province from 1982 to 2015

【目的/意义】在遥感及地理信息系统技术的支持下,利用1982-2015年的NASA/GIMMS的NDVI数据,分析山西省忻州市1982-2015年的植被覆盖时空变化特征,得出其气候变化规律,突显其区域环境意义。【方法/过程】采用最大值合成法、一元线性回归法及相关性分析法,结合中国气象共享网的气象数据,用ArcGIS和Excel软件对相关数据进行处理和分析。【结果/结论】结果表明:忻州市从1982-2015年内植被生长季(4-10月)的月均NDVI在时间上呈总体增加趋势,增长率较高,同时在空间上也表现为增加的趋势;忻州市1982-2015年内的气候变化特征是:时间上以气温增加为主,降水变化比较平稳,在空间上表现为忻州市西部地区的气候变化小于东部地区,山地的气候变化小于盆地和河流流域地区,降水量值呈东南向西北递减趋势;气温和降水是影响忻州市1982-2015年的植被生长季(4-10月)的NDVI时空变化的主要驱动力因素,且气温和降水都有所增加,并对植被的生长产生积极的作用;尤其是气温的增加对植被的生长的影响比较明显,相比之下降水量的时空变化则对植被的生长影响较小。

【Objective/Meaning】With the support of remote sensing and GIS technology, by using the NDVI data of NASA/GIMMS from 1982 to 2015, the temporal and spatial variation characteristics of vegetation cover in Xinzhou City of Shanxi Province from 1982 to 2015 were analyzed, and the climate change rules were obtained to highlight its regional environmental significance.【Methods/Procedures】By using the maximum synthesis method, the unary linear regression method and the correlation analysis method are, combined with the meteorological data of China Meteoro logical Sharing Network, the relevant data were processed and analyzed through the ArcGIS and Excel software,【Re- sults/Conclusions】The results showed that:(1) The average monthly NDVI of the vegetation growing season ( April to October) in Xinzhou City from 1982 to 2015 showed an overall increase trend with a high growth rate, and also showed an increase trend in space.(2) The characteristics of climate change in Xinzhou City from 1982 to 2015 were as follows: In time, the temperature was mainly increased, and the precipitation changes were relatively stable. In space, the climate change in the western region of Xinzhou City was smaller than that in the eastern region, and the climate change in the mountainous region was smaller than that in the basin and river basin, and the precipitation val ue showed a decreasing trend from southeast to northwest.(3) Temperature and precipitation were the main driving forces for the spatial and temporal changes of NDVI during the vegetation growing season (April to October) from 1982 to 2015 in Xinzhou City, and both the temperature and precipitation have increased, which have a positive effect on the growth of vegetation. In particular, the increase of temperature had an obvious effect on the growth of vegeta tion, while the spatial-temporal change of precipitation had a smaller effect on the growth of vegetation.