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1、第29卷第3期水土保持通报Vol.29,No.32009年6月BulletinofSoilandWaterConservationJun.,2009侵蚀沉积连续地形中土壤碳库的空间分异试验刘兆云,章明奎研(浙江大学环境与资源学院浙江省亚热带土壤与植物营养重点研究实验室,浙江杭州310029)究摘要:侵蚀和再沉积过程可导致土壤碳库在空间上重新分布,但至今对这一过程中不同碳库的迁移和再分布特点还了解不多。在浙江省亚热带地区选择了由严重侵蚀区轻微侵蚀区坡脚堆积区坡底堆积区组成的侵蚀沉积系列连
2、续地形,分别采集了4个代表性土壤剖面,研究了不同地形部位土壤碳库的分异特征,探讨了侵蚀再沉积过程中各种碳库的转归。结果表明,土壤有机总碳及各组分碳均是:严重侵蚀区<轻微侵蚀区<坡脚堆积区<坡底堆积区。侵蚀区土壤总有机碳自上而下明显下降,而堆积区土壤有机碳库分布较深,垂直变化相对平缓。黑碳极易随地表径流发生迁移,呈由高处逐渐向低处明显富集的趋势。堆积区为连续地形中的碳汇。关键词:侵蚀沉积连续地形;颗粒态有机碳;黑碳;迁移;空间分异文献标识码:A文章编号:1000288X(2009)0
3、3006105中图分类号:S714,S153.6SpatialVariationofSoilOrganicCarbonPoolsinErosiondepositionContinuationLandformLIUZhaoyun,ZHANGMingkui(ZhejiangProvincialKeyLaboratoryofSubtropicSoilandPlantNutrition,andCollegeofNaturalResourcesandEnvironmentalSciences,Zhe
4、jiangUniversity,Hangzhou,Zhejiang310029,China)Abstract:Soilerosionandredepositionmayresultinredistributionofsoilcarboninterrestrialsystems.However,limitedinformationisavailableabouttransferandredistributioncharacteristicsofvarioussoilorganicCinthepro
5、cessesoftheerosionandredeposition.Arepresentativeerosiondepositionlandform,consistingofstronglyerodedzone,slightlyerodedzone,slopedepositionalzone,andbottomdepositionalzone,wasselectedtosamplefoursoilprofilesforstudyingthespatialvariationofvariousor
6、ganiccarbonpoolsindifferentlandformpositionsandexploringfateofvariousorganicCintheprocessesofsoilerosiondeposition.ResultsshowedthatintrinsiccharacteristicsofvariousorganicCgreatlyaffectedtheirtransferanddistributionbehaviors.Contentsoftotalsoilorga
7、nicCanditscomponentsincreasedintheascendantorderofstronglyerodedzone,slightlyerodedzone,slopedepositionalzone,andbottomdepositionalzone.TotalorganicCcontentofsoilprofilesintheerodedzonesdecreasedsignificantlyalongwithsamplingdepth,meanwhilethoseindep
8、ositionalareaskeptrelativelyhighorganicCinallsamplingdepths,evenatthedeeplayer.BlackCisthemostmobileformofsoilorganicCandittendedtobeaccumulatedinthesoilsinbottomdepositionalzoneofthecontinuationlandform.Becauseofbeingburiedorphysicall
