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时间:2020-05-01
《内蒙古农牧交错带土地利用变化对CH_4吸收的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、中国环境科学2014,34(6):1514-1522ChinaEnvironmentalScience内蒙古农牧交错带土地利用变化对CH4吸收的影响焦燕,侯建华,赵江红,杨文柱(内蒙古师范大学化学与环境科学学院,内蒙古呼和浩特010022)摘要:于2008~2010年,根据邻近样地采样原则,选择位于内蒙古农牧交错带的天然草地和不同开垦时间的农田作为研究样地(G一草地;c5一开垦5a的农田;C10-开垦10a的农田;和C50一开垦50a的农田),利用静态箱法通过3a的野外试验,研究土地利用类型变化对CH4吸收的
2、影响.结果表明:天然草地转变为农田后,不同开垦年限的农田土壤和草地土壤CH4吸收存在显著差异2008年(RH4=273.7,P<0.001)2009年(FcH4=264.8,P<0.001)和2010年(FcH4=362.4,P<0.OO1).草地转变为农田促进CH4吸收,2008,2009和2010年生长季的生长季(4~l0月),草地CH4吸收量最低分别为141.4,210.0,236.0mg/m2.2008~2010年农田土壤C}14累积吸收量与草地土壤相比增加20%-280%.农田开垦年限影响cH吸收,
3、随着农田开垦年限的增加从开垦5~50a,CH4累积吸收量降低.相关分析表明,不同土壤CH4吸收与土壤水分含量和NH4+~N含量呈负相关关系:O.7380,P<0.01).草地转变为农田后,土壤水分含量和NI-h—N含量驱动不同开垦年限的农田土壤和草地土壤CH吸收差异.关键词:土地利用;Cl-h吸收:土壤特性:开垦年限中图分类号:X511,S151.9,$182文献标识码:A文章编号:1000—6923(2014)06—1514—09Land-usechangefromgrasslandtocroplandaf
4、ectsCH4uptakeinthefarming—pastoralecotoneofInnerMongolia.JIAOYan’,HOUJian-hua,ZHAOJiang-hongYANGWen—zhu(CollegeofChemistryandEnvironmentalSciences,Inner.MongoliaNormalUniversity,Hohhot010022,China).ChinaEnvironmentalScience,2014,34(6):1514~1522Abstract:CH4u
5、ptakewerecomparedaftergrasslandandcroplandsoilsintheagro-pastoralecotoneofInnerMongoliaoverthreegrowingseasons(2008-2010).Fouradjacentsiteswithdiferentland-usehistorieswereselected,includinggrassland(referencesite)andcropland5,10and50yearsafterconversion.Th
6、efluxmeasurementswereobtainedusingaclosed—chambermethodandwereperformedcontinuouslyfromApriltoOctoberin2008,2009and2010instudysite.TheresultsshowedasignificantdifferenceinCH4uptakebetweencroplandandgrasslandin2008(Fel4273.7,P7、)and2010(FcH4=362.4,P<0.001).GrasslandhadthelowestCH4uptakevaluesof141.4mg/m,210.0mg/mand236.0mg/m~inthe20082009and2010samplingseasons,respectively.ThecumulativeCH4uptakeof,croplandsoilincreasedby20%~280%,comparedwiththegrasslandsfrom2008to2010.Decreasedcum8、ulmiveCH4uptakewasobservedwithanincreaseincroplandagefrom5to50years.CH4uptakeswerenegativelycorrelatedwithsoilNI-hN=0.7380,P<0.01)andsoilmoisture.OurstudyindicatedthatCHauptakeexistedobviouslydifferenc
7、)and2010(FcH4=362.4,P<0.001).GrasslandhadthelowestCH4uptakevaluesof141.4mg/m,210.0mg/mand236.0mg/m~inthe20082009and2010samplingseasons,respectively.ThecumulativeCH4uptakeof,croplandsoilincreasedby20%~280%,comparedwiththegrasslandsfrom2008to2010.Decreasedcum
8、ulmiveCH4uptakewasobservedwithanincreaseincroplandagefrom5to50years.CH4uptakeswerenegativelycorrelatedwithsoilNI-hN=0.7380,P<0.01)andsoilmoisture.OurstudyindicatedthatCHauptakeexistedobviouslydifferenc
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