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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。
Soil respiration rate is closely related to soil microorganisms. The effects of soil microbes on soil respiration rate on the northern slope of Taibai Mountain were studied. The order of soil respiration rate of different vegetation types was: Quercus variabilis forest (5.5μmol / (m2.s))> birch forest (4.25μmol / (m2.s))> deciduous broadleaf forest (4.62μmol / (m2.s) )> Poplar forest (1.90μmol / (m2.s))> Picea crassifolia forest (1.77μmol / (m2.s))> Abies fir forest (1.73μmol / m2.s)> Alpine meadow (1.63μmol / (m2.s)). Actinomycetes and bacteria showed monomodal variation with increasing altitude except the number of fungi in different vegetation types increased with altitude. Soil respiration rate was significantly and positively correlated with soil bacteria and actinomycetes (P <0.01), negatively correlated with fungi (P <0.01), but significantly correlated with altitude gradient (P <0.05) Soil respiration is greatly affected by soil microbial community.