河南省土地利用碳源/汇及其变化分析

Research on Carbon Sources/Sinks of Land Use of He'nan Province

土地利用变化及其碳源/汇状况是影响区域碳循环的重要因素。该文构建了土地利用碳源/汇研究的理论框架和计算模型;采用1999-2008年河南省的能源消费、土地利用等数据,对河南省不同土地利用方式的碳源/汇状况及其强度进行了分析。结果表明:(1)河南省土地利用碳排放呈明显增加趋势,其中建设用地和农用地是主要的碳排放源;2003年以来河南省城市建设用地加速扩张,造成建设用地碳排放量的大幅增加;(2)河南省土地利用碳吸收呈缓慢增长趋势,其中农作物是最主要的碳汇;(3)建设用地碳排放强度最大,为56.46 t/(hm2.a),而耕地的碳汇能力最强,为9.17t/(hm2.a)。(4)1999年以来,地均碳排放强度呈加速增长趋势,而同时期单位GDP碳排放强度则呈下降趋势。

Land use change and its impact on carbon sources and sinks are important factors that affect the carbon cycle process.This paper firstly established the theoretical framework and estimation model of carbon sources and sinks of land use,then analyzed the carbon sources/sinks of different land use types of He＇nan province by using energy consumption and land use data of He＇nan province from 1999 to 2008.The conclusions are as following：（1） Carbon emission from land use of He＇nan province increased rapidly since 1999,in which construction land and cropland were the main carbon sources.Because urban areas expanded rapidly,the carbon emission from construction land increased rapidly.（2）Carbon sink by land use of He＇nan province slowly increased since 1999,in which,cropland was the main carbon sinks.（3） The carbon emission intensity of construction land was the highest [56.46 t/（hm2·a）],while the carbon sink intensity of cropland was the highest [9.17 t/（hm2·a）] among others.（4）Per unit area carbon emission intensity increased rapidly since 1999,meanwhile,per GDP carbon emission intensity declined.