河北省植被NDVI时空演变特征及影响因素

Spatial-Temporal Evolution Characteristics and Influencing Factors of Vegetation NDVI in Hebei Province

为了探究植被生长状况及影响因素,以河北省为研究区域,基于卫星遥感数据和气象数据,利用Mann-Kendell趋势检验、Sen斜率、偏相关分析等方法,探讨河北省植被时空分布特征,并结合NDVI与气候因子、人类活动的相关性分析河北省植被NDVI变化的影响因素。结果表明:(1)河北省2001—2020年植被NDVI值时间上总体呈增长趋势,年均增长率为2.84×10-3,其中2001—2005年呈现快速增长趋势,2005—2020年为缓慢增长,并伴有波动;(2)研究区植被NDVI值空间上由南向北逐级递增,植被改善区域(81.71%)大于退化区域(13.79%),改善区域主要集中在承德、张家口市;(3)人类活动(GDP)是影响NDVI增长的主要影响因素之一,气候因子(降水、温度)次之。GDP的变化对植被的生长有着显著的影响,且河北省植被的改善主要与林地和草地相关;气候因子中,降水是主要影响因素。

In order to explore the vegetation growth status and influencing factors,Hebei Province is taken as the research area.Based on satellite remote sensing data and meteorological data,the Mann-Kendall trend test,Sen slope,and partial correlation analysis are used to explore the temporal and spatial distribution characteristics of vegetation in Hebei Province,and the influencing factors of vegetation NDVI change in Hebei Province are analyzed by combining the correlation among NDVI,climatic factors,and human activities.The results show that①the NDVI value of vegetation in Hebei Province from 2001 to 2020 shows an overall growth trend,with an average annual growth rate of 2.84×10-3.Specifically,it shows a rapid growth trend from 2001 to 2005 and a slow growth trend from 2005 to 2020,with fluctuations.②The NDVI value of vegetation in the study area increases gradually from south to north,and the vegetation improvement area(81.71%)is greater than that in the degraded area(13.79%),and the improvement area is mainly concentrated in Chengde and Zhangjiakou City.③Human activities(GDP)are one of the main influencing factors affecting the growth of NDVI,followed by climatic factors(precipitation and temperature).The change in GDP has a significant impact on vegetation growth,and the improvement of vegetation in Hebei Province is mainly related to forest land and grassland.Among the climatic factors,precipitation is the main influencing factor.