基于CASA模型的吉林西部植被净初级生产力时空特征及其碳汇量估测.docVIP

 n 基于 CASA 模型的吉林西部植被净初级生 产力时空特征及其碳汇量估测# 汤洁，姜毅，张楠，李昭阳* 5 10 15 20 25 30 35 40 （吉林大学环境与资源学院，长春，130021） 摘要：利用 MODIS 数据，结合气象数据与植被类型图，将 CASA 模型与土壤微生物呼吸模 型有机结合，计算了吉林西部的陆地植被净初级生产力（NPP）和净生态系统生产力（NEP）， 研究其时空变化规律，分析盐碱地的净生态系统生产力变化的原因，结果表明：研究区 NPP 呈自西向东逐渐增加的趋势，年均 NPP 值与气温、降水不显著相关，逐年 9 月份 NPP 与降 水量显著相关；研究区 NEP0 的区域主要分布在土地盐碱化比较严重的西南、西北和中部 地区，研究区东部地区和西北的两个水田灌区的 NEP 较高；10 年间研究区 NEP 总体上呈上 升趋势，个别年份因气候有较大变化而有所偏差；2001 年－2009 年间，研究区盐碱地区 NEP0 的土地面积逐渐减小，反之，NEP.0 的土地面积持续增加，围栏封育等方法对吉林 西部盐碱地的生态环境改善起到了积极的作用。 关键词：环境遥感；碳汇；NPP；CASA 模型；NEP；吉林西部 中图分类号：X87 Temporal-spatial Characteristics of vegetation net primary productivity based on CASA model and estimation of carbon sink in western Jilin province Tang Jie, Jiang Yi, Zhang Nan, Li Zhaoyang (College of Environment and Resources, Jilin University, Changchun 130021, China) Abstract: The net primary productivity (NPP) and net ecosystem productivity (NEP) in western Jilin province have been estimated by using MODIS, meteorological data and vegetation type map, along with combination of CASA model and soil microbial respiration model. Analyzing the temporal and spatial variation and the reason causing the change in NEP of alkali soil, it is found that NPP in this area showed an increasing tendency from west to east. Within this study area, the NPP is higher in the east and the southeast while lower in the middle and the west. The annual NPP is not much related to the temperature and precipitation，but the NPP of September only is highly related to the precipitation. NEP0 in the southwest, northwest and central parts owes to the alkali soil. By comparison, the NEP is higher in the east and the northwest. The overall NEP has shown an increasing trend over the last 10 years, with some fluctuations due to climate change. Between the years of 2001 and 2009, the alkali areas with NEP0 have been decreasing while that with NEP0 increasing. It is found that fence-feeding and other methods have played a positive role in improving ecological environment of