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土壤微生物对不同植被类型土壤呼吸速率影响的研究

DOI: 10.7668/hbnxb.2010.03.041, PP. 196-199

Keywords: 土壤呼吸速率,细菌,放线菌,真菌

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Abstract:

土壤呼吸速率与土壤微生物密切联系。研究了太白山北坡植被土壤微生物对土壤呼吸速率的影响。不同植被类型土壤呼吸速率大小顺序是:阔叶栎林(5.5μmol/(M2.s))>桦木林(4.25μmol/(M2.s))>落叶阔叶林(4.62μmol/(M2.s))>杨树林(3.09μmol/(M2.s))>太白红杉林(1.77μmol/(M2.s))>秦岭冷杉林(1.73μmol/(M2.s))>高山草甸(1.63μmol/(M2.s))。不同植被类型土壤除真菌数量随海拔升高而增多之外,放线菌、细菌都是随海拔升高呈单峰变化趋势。土壤呼吸速率与土壤细菌、放线菌呈极显著正相关性(P<0.01),与真菌则呈极显著负相关(P<0.01),而与海拔梯度呈显著相关(P<0.05),表明土壤呼吸受土壤微生物群落影响较大。

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