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草业科学  2014 

放牧和补播对草地土壤有机碳和微生物量碳的影响

DOI: 10.11829\j.issn.1001-0629.2013-0181, PP. 367-374

Keywords: 典型草原,管理措施,有机碳,微生物量碳

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Abstract:

?为评估草地的碳源/汇功能,探索可持续发展的草地管理措施,以内蒙古锡林郭勒典型草原为研究区域,采用野外调查取样结合室内分析的方法,分析了土壤有机碳(SoilOrganicCarbon,SOC)和土壤微生物量碳(SoilMicrobialBiomassCarbon,SMBC)的变化规律,探讨了围栏封育29年(WF29)、围栏封育8年(WF8)、补播苜蓿(Medicagosativa)(RA)、补播羊草(Leymuschinensis)(RC)、以及轻度放牧(LG)、中度放牧(MG)和重度放牧(HG)共7种处理对SOC和SMBC分布的影响以及草地SOC和SMBC碳库储量的大小。结果表明,从土壤剖面来看,SOC、SMBC含量在土壤表层较高,为草地的主要碳库,随着土壤深度的增加呈现降低的趋势。土壤根系层(0-30cm)中,WF8、WF29、RA、RC、LG和MG的SOC和SMBC均高于HG,其中WF8正效应较为明显,有利于提高SMBC与SOC含量。SOC与SMBC呈显著正相关关系(P<0.05)。可以通过SMBC的变化反映SOC的变化,进而反映SOC碳库的变化。经估算,锡林浩特市草地0-30cm总的SOC和SMBC碳储量分别为788.86和9.48Gg。其中,围封8年的SOC和SMBC碳储量的值都为最高,分别为661.76和6.76Gg,人工种草措施的值均为最低,分别为0.61Gg和5.73t。SOC和SMBC含量对于土壤肥力和土壤品质变化有指示作用,可作为草地碳汇的重要评估指标。

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