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1、应用生态学报2010年1月第21卷第1期ChineseJournalofAppliedEcology,Jan.2010,21(1):91-98耕作方式转变对小麦/玉米两熟农田土壤3固碳能力的影响33韩宾孔凡磊张海林陈阜(中国农业大学农学与生物技术学院农业部农作制度重点开放实验室,北京100193)摘要采用大田试验、室内分析与生产调研相结合的方法,研究了耕作方式对农田生态系统固碳能力的影响.结果表明:少、免耕以及秸秆还田等保护性耕作措施有利于土壤有机碳的累积;免耕秸秆还田(NTS)方式0～5cm土层土壤有机碳累积量比传统耕作(CTA)方式高1810%,旋耕秸秆还田(RTS)0
2、～5和5～10cm土层比CTA分别高1716%和2510%,而翻耕秸秆还田(CTS)方式10～30cm土层土壤总有机碳累积量比CTA高3118%;CTA转变为NTS-2-1后,源于农田投入的碳排放减少了5413kg·hm·a,而转变为CTS、RTS后,分别增加了-2-1-2-14619kg·hm·a和3414kg·hm·a;综合土壤碳累积与农田投入碳排放可知,传统耕作转变为保护性耕作方式后可实现由“碳源”向“碳汇”的转变,而CTS、RTS、NTS3种耕作-2-1方式中以RTS的固碳能力最强,达101111kg·hm·a.关键词耕作方式麦/玉两熟农田生态系统固碳能力文章编号1
3、001-9332(2010)01-0091-08中图分类号S341文献标识码AEffectsoftillageconversiononcarbonsequestrationcapabilityoffarmlandsoildoubledcroppedwithwheatandcorn.HANBin,KONGFan2lei,ZHANGHai2lin,CHENFu(MinistryofAgricultureKeyLaboratoryofFarmingSystem,CollegeofAgronomyandBiotechnology,ChinaAgriculturalUniversit
4、y,Beijing100193,China).2Chin.J.Appl.Ecol.,2010,21(1):91-98.Abstract:Bythemethodsoffieldexperiment,laboratoryanalysis,andinsituinvestigation,thispaperstudiedtheeffectsofdifferenttillageconversiononthecarbonsequestrationcapabilityoffarmlandsoildoubledcroppedwithwheatandcorn.Comparedwithconve
5、ntionaltillage(CTA),conservationtillagepracticesbenefitedtheaccumulationofsoilorganiccarbon,amongwhich,no2tillageplusstrawreturning(NTS)increasedtheorganiccarbonaccumulationin0-5cmsoillayerby1810%,rotarytillageplusstrawreturning(RTS)increasedthisaccumulationin0-5and5-10cmsoillayersby1716%a
6、nd2510%,respectively,andconventionaltillageplusstrawreturning(CTS)increasedtheorganiccarbonin10-30cmsoillayerby3118%.Aftertheconversionfrom-2-1CTAtoNTS,thecarbonemissionfromfarmoperationsdecreasedby5413kg·hm·a;whiletheconversionfromCTAtoCTSandRTSresultedinanincreaseofthisemissionby4619kg·-
7、2-1-2-1hm·aand3414kg·hm·a,respectively.Consideringoftheaccumulationofsoilorgan2iccarbonandthecarbonemissionfromfarmoperations,itcouldbeconcludedthattheconversionfromCTAtoconservationtillagechangedthisfarmlandsoilfromcarbonsourcetocarbonsink,andtheRTSamongtheth
