生态与农村环境学报2007,23(2):1-6,11JournalofEcologyandRuralEnvironment中国沿海地区农田生态系统部分碳源/汇时空差异12赵荣钦,秦明周(1.华北水利水电学院资源与环境学院,河南郑州450011;2.河南大学环境与规划学院,河南开封475001)摘要:运用1981—2001年作物产量、农业投入等统计数据,对沿海10个省市自治区农田生态系统部分碳源/汇进行了估算,得到以下主要结论:(1)总碳吸收从1981年以来呈波动增加趋势,总碳排放则呈明显增长趋势。二者相比,碳排放明显低于碳吸收,但由主要途径农业投入导致的间接碳排放的增长速度(94%)超过了作物生育期碳吸收的增长速度(44%)。(2)各省市自治区碳吸收、碳排放变化的区域差异显著,单位面积碳吸收、碳排放变化的差异也十分明显。其中,各省市自治区总碳排放和单位面积碳排放基本上逐年增加,表明沿海发达地区农业投入较高;而碳吸收变动幅度较大,发达地区(如浙江、福建和上海等)碳吸收呈下降趋势,反映沿海地区农作物种植面积下降致使农作物生育期总碳吸收量降低。(3)沿海地区农田生态系统主要粮食作物碳吸收占全国比例有所下降,说明沿海地区农业种植面积减少和农业投入增加削弱了农田生态系统的碳汇功能。关键词:沿海地区;农田生态系统;碳吸收;碳排放;碳源;碳汇中图分类号:X21;S181文献标识码:A文章编号:1673-4831(2007)02-0001-06TemporospatialVariationofPartialCarbonSource/SinkofFarmlandEcosysteminCoastalChina.ZHAORong2qin1,QINMing2zhou2(1.CollegeofResourcesandEnvironment,NorthChinaInstituteofWaterConservancyandHydroe2lectricPower,Zhengzhou450011,China;2.CollegeofEnvironmentandPlanning,HenanUniversity,Kaifeng475001,Chi2na)Abstract:Basedonthestatisticdataofcropyieldandagriculturalinputintheperiodfrom1981to2001,carbonsourcesandsinksofthefarmlandecosystemsinthe10coastalprovinces,metropolisesandautonomousregionsofChinawereesti2mated.Conclusionsarereachedasfollows:(1)ThetotalcarbonsinkofthefarmlandecosystemincoastalChinawaszigzag2gingupwardsince1981,andthetotalcarbonemissionclimbingrapidly.Butcomparisonshowstheformerwentatahigherratethanthelatter.However,theincreasingrate(94%)oftheindirectcarbonemissioncausedbyagriculturalinputex2ceedsthatofcarbonsink(44%)duringthecropgrowingseason.(2)Significanttemporospatialvariationisobservedofto2talcarbonsinkandemissionandofcarbonsinkandemissionperunitareabetweendifferentregionsandamongthem,bothtotalemissionandemissionperunitareashowedarisingtrendwitheachpassingyear.Thedrasticvariationofthecarbonsinkindevelopedregionsisaresultofrelativelyhigheragriculturalinput.Thetotalcarbonsinkinrelativelydevelopedre2gionsshowedadownwardtrendfrom1981to2001,whichindicatesthatdecreasedacreageoffarmlandinthecostalregionsreducedc