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为研究城市功能分区对绿地土壤活性碳氮的影响,选择合肥市不同功能区(老商业区、老工业区、居民服务区、近郊森林公园)绿地土壤为研究对象,分析了土壤微生物量碳氮(MBC、MBN)、溶解性碳氮(DOC、DON)、有机碳(SOC)、全氮(TN)以及土壤基本理化性质的差异及其相互关系。结果表明,功能区类型对土壤微生物量碳氮及溶解性碳氮影响显著(P<0.05),且0~30 cm土层含量均为近郊森林公园高于城区内各功能区。土层厚度对MBC、DOC、DON含量影响显著,MBC、DON在各功能区中均随土层深度增加而递减,森林公园MBN、DOC均为10~20 cm含量最高。不同功能区MBC/MBN在6~14间波动,以此预测本研究范围内土壤微生物可能以真菌和放线菌为主,细菌较少。本研究未证实DOC与MBC、MBC与DON、DON与MBN间的相关性,MBC+DOC、MBN+DON比MBC、DOC、DON、MBN更能反应土壤活性碳氮库与土壤微生物量。总体来说,相比城区内各功能区,近郊森林公园更利于土壤生物量碳氮及溶解性有机碳氮的积累。
In order to study the effect of urban functional zoning on the active carbon and nitrogen in the soil of the green area, the soil in the green area of different functional areas (old commercial area, old industrial area, residential service area and suburban forest park) in Hefei was selected as the research object, MBC, MBN, DOC, DON, SOC and TN, as well as the difference of basic physical and chemical properties of soil and their correlation. The results showed that the functional area types had significant effects on soil microbial biomass C and N and soluble carbon and nitrogen (P <0.05), and the contents of 0 ~ 30 cm soil layer were higher in suburban forest parks than in urban functional areas. Soil thickness affected the MBC, DOC and DON significantly. MBC and DON decreased with soil depth in all functional areas. The content of MBN and DOC in forest park was the highest among 10 ~ 20 cm. The MBC / MBN in different functional areas fluctuated from 6 to 14, which predicted that the soil microorganisms in this study might be mainly fungi and actinomycetes with less bacteria. The correlation between DOC and MBC, MBC and DON, DON and MBN was not confirmed in this study. MBC + DOC and MBN + DON were more responsive to MBC and DOC than MBC, DOC, DON and MBN. In general, Suburban Forest Park is more conducive to the accumulation of soil organic carbon and nitrogen and dissolved organic carbon than the functional areas in urban areas.