湖北省植被净初级生产力时空变化特征及其影响因素分析

Spatiotemporal Variations of the Net Primary Productivity and Its Influential Factors in Hubei Province

基于改进的光能利用率模型,本文利用MODIS数据和同期气象数据估算分析了湖北省2001—2012年间植被净初级生产力(NPP)的时空变化特征并借助多元统计分析方法定量探究自然因素(气温、降水量、太阳辐射)和人为因素(土地覆被/土地利用、粮食播种面积、粮食产量、人口数量)对NPP变化的影响。结果表明:1)湖北省NPP呈波动上升趋势,年际增加趋势为8.19 g/m~2·a;2) NPP空间分布差异明显,呈现西高东低、北高南低、从西向东逐渐递减的态势;3)造林累计面积和太阳辐射变化是影响NPP变化的主要因素。

This study explored the spatiotemporal variations of the net primary productivity(NPP)in Hubei province from 2001 to 2012 by using MODIS data based on the improved Carnegie Ames Stanford Approach(CASA)model and quantitatively investigated the effects of natural(air temperature,rainfall,and solar radiation)and human factors(land cover/land use,grain sowing area,grain yield,and population)on NPP by using multivariate statistical analysis.The results indicated that:(1)The annual mean NPP fluctuatedly increased at the rate of 8.19 g/m 2·a during the study period;(2)The NPP was generally higher in Western and Northern parts of the study area;(3)The cumulative afforestation area and solar radiation were the dominant influential factors for the changes of NPP in Hubei province.