2001—2019年河北省植被NPP时空变化分析

Spatio-temporal variation analysis of vegetation net primary productivity in Hebei Province from 2001 to 2009

为研究河北省植被净初级生产力(net primary productivity,NPP)的时空变化与驱动机制,基于河北省2001—2019年植被NPP数据、土地利用类型数据和气象数据,采用一元线性回归和相关性分析相结合的方法,对河北省植被NPP时空变化与影响因素进行定量研究。结果表明:(1)从时间上看,2001—2019年河北省植被NPP值总体呈增加趋势,植被NPP有机碳产出年均值为237.55~354.36 g/m^(2);(2)从空间上看,河北省植被年均NPP分布总体呈北高南低、东北高西南低的特征,符合地理分异规律,且高值区多分布在河北省北部与西部山地;(3)2001—2019年,与降水量正相关的河北省植被NPP面积高达93.14%,与气温负相关的河北省植被NPP面积为78.96%,同时,河北省植被NPP的空间分布特征与植被类型分布也有关,其中林地植被NPP最高且增长速度最快。

In order to study the temporal and spatial change and driving mechanism of vegetation NPP in Hebei Province,based on the vegetation NPP data,land cover type data and meteorological data in Hebei Province from 2001 to 2019,a quantitative study was made on the change characteristics of vegetation NPP in Hebei Province by using the combination of univariate linear regression analysis and correlation analysis.The results showed that:(1)In terms of time,NPP in Hebei Province showed an increasing trend from 2001 to 2019,and the annual mean value of NPP varied from 237.55 to 354.36 g/m^(2);(2)Spatially,the average annual NPP distribution of vegetation in Hebei Province generally showed the characteristics of high in the north,low in the south,high in the northeast and low in the southwest,which was in line with the law of geo-graphical differentiation,and the high-value areas were mostly distributed in the mountains in the north and west of Hebei Province;(3)From 2001 to 2019,the area of positive correlation between vegetation NPP and precipitation in Hebei Province was as high as 93.14%,and the area of negative correlation with tempera-ture was 78.96%.At the same time,the spatial distribution of vegetation NPP in Hebei Province was also related to the distribution of vegetation types.The vegetation NPP in woodland was the highest and the fast-est growing.