2000—2011年广西植被净初级生产力时空分布特征及其驱动因素  

Changes of vegetation net primary productivity and its driving factors from 2000to 2011 in Guangxi,China

作　　者：李燕丽[1,2] 潘贤章[1] 王昌昆[1,2] 刘娅[1,2] 赵其国[1] 

机构地区：[1]中国科学院土壤环境与污染修复重点实验室(南京土壤研究所),南京210008 [2]中国科学院研究生院,北京100049

出　　处：《生态学报》2014年第18期5220-5228,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金重点项目(U1033004)

摘　　要：受人类活动及自然环境影响,广西土壤酸化、水土流失及石漠化等问题比较严重,生态环境面临巨大压力。NPP能有效反映植物群落在自然环境中的生产能力,是评价生态服务功能的重要指标。利用2000—2011年MODIS归一化植被指数(NDVI)数据,基于光能利用率模型对广西植被净初级生产力(NPP)进行估算,分析其时空变化规律,探讨气象因子、植被类型、土壤类型、海拔高度及人类活动的影响。研究表明:近12年广西全区NPP总体呈增加趋势,在西南部地区上升较为明显,而在桂林、柳州等地区呈缓慢下降趋势。广西NPP与降水呈显著正相关关系,与温度相关性不显著;NPP值随海拔高度升高而增加;NPP时空变化特征随植被类型和土壤类型的不同而不同,其中栽培植被NPP不断上升,显示人类活动逐渐成为影响NPP变化的主要因素。Ecological safety has faced serious threats from soil acidification, erosion and rocky desertification caused by natural disasters and increasing human activities in Guangxi. NPP which can effectively reflect productivity of plant community in the environment is one of the key indices for assessing the function of ecosystem service. The vegetation net primary productivity （NPP） in Guangxi province from 2000 to 2011 was estimated using the light use efficiency model and the time-series NDVI of MODIS data. And the spatio-temporal variation of vegetation NPP was analyzed based on several affecting factors, such as climate, vegetation types, soil types, topography, and human activities. The results showed that the NPP had increased in Guangxi province on the whole, especially the southwestern area. However, it decreased gently around Guilin and Liuzhou in recent 12 years. There was a significant positive relationship between total NPP and annual precipitation, while no significant relationship between total NPP and annual average temperature. The spatio-temporal variation characteristics of NPP changed with different vegetation types and soil types. The NPP of cultivated vegetation had been increased constantly and the human activities had become the important role on the NPP variation gradually.

关 键 词：广西 NPP NDVI 驱动因素 

分 类 号：Q948[生物学—植物学]