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施用生物炭对旱作农田土壤有机碳、氮及其组分的影响

DOI: 10.11654/jaes.2015.03.013

Keywords: 生物炭 有机碳 全氮 旱作农田 储量 分布 用量

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Abstract:

通过安排田间试验,在旱作农田土壤中施用果树树干、枝条生物炭,分层分析不同用量(0、20、40、60、80 t·hm-2)生物炭对农田土壤有机碳、氮及其组分的影响。结果表明:在0~10 cm土层,土壤总有机碳(TOC)、颗粒有机碳(POC)、易氧化有机碳(EOC)随生物炭施用量的增加而增加,微生物生物量碳(MBC)、全氮(TN)、碱解氮(AN)、硝态氮(NO3--N)、微生物生物量氮(MBN)均在生物炭施用量为60 t·hm-2时达到最大,分别比对照(B0)显著增加87.22%、33.33%、18.76%、94.79%、178.80%;在10~20 cm土层,TOC、POC、TN、NO3--N随生物炭施用量的增加而增加,EOC、MBC、AN均在生物炭用量为60 t·hm-2时达到最大,分别比B0显著增加78.05%、23.85%、31.07%,而MBN在40 t·hm-2时达到最大,比B0显著增加50.87%;在20~30 cm土层,并没有直接地施用生物炭,但因为上层生物炭的影响,除NO3--N外,其余各指标含量多在60 t·hm-2或80 t·hm-2时显著高于B0;此外,随生物炭施用量的增加,土壤有机碳储量和氮储量在0~30 cm土层分别增加37.92%~108.31%和1.05%~14.94%,其中氮储量在生物炭用量为60 t·hm-2时达到最大。相关分析也表明,土壤TOC、EOC、POC、TN、AN、NO3--N含量与生物炭施用量呈极显著的正相关(P<0.01)。因此,适量施用生物炭具有提高旱作农田土壤有机碳、氮含量,增加土壤碳截留,提升土壤养分供应的能力。推荐生物炭施用量为60 t·hm-2

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