Effect of vegetations and temperature on microbial biomass carbon and metabolic quotients of temperate volcanic forest soils
Effect of vegetations and temperature on microbial biomass carbon and metabolic quotients of temperate volcanic forest soils
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DOI：
10.1016/j.geoderma.2006.03.045
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发表时间：
2006-12
期刊：
影响因子：
6.1
通讯作者：
Xingkai Xu;K. Inubushi;K. Sakamoto
中科院分区：
文献类型：
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作者：
Xingkai Xu;K. Inubushi;K. Sakamoto
土壤碳的有效性和微生物的利用效率，以不同的植被和温度升高的反应强调需要进一步研究火山森林土壤。研究了温带火山森林土壤微生物生物量C（MBC）和代谢产物（qCO 2，CO2-C/biomass-C）对植被和温度的响应。土壤取样于2003年4月和10月下四个森林站在附近（相距200米）在日本中部：日本雪松针叶林（CI），松树针叶林（CII），和橡树为主的硬木的分级和陡坡（DI和DII）。在好氧条件下测定了各林分下土壤MBC浓度和qCO 2值，沿着分析了温度和低温长期贮藏对土壤MBC浓度和qCO 2值的影响。不同林分土壤微生物群落碳利用效率的比较结果表明，松树林土壤微生物群落碳利用效率最低，qCO 2最大（P<0.05）。在同一种以橡树为主的阔叶林下，陡峭的地形导致土壤呼吸和MBC浓度降低，但在25 °C下两种土壤的qCO 2值没有显著差异。各林分下土壤MBC浓度在两个采样期内基本没有差异。低温贮藏导致土壤MBC增加，CO2产生减少，qCO 2降低。在5 ~ 35 °C范围内，CII土壤中的MBC浓度小于CI和DII土壤; DI和CII土壤中的MBC浓度和qCO 2对温度升高的敏感性高于DII和CI土壤。结果表明，在相似的气候条件和土壤类型下，温带火山森林土壤的MBC浓度和qCO 2值随树种和温度的不同而不同，高的土壤C/N比和低的酸度有助于降低土壤MBC浓度和增加qCO 2。
The response of soil carbon availability and microbial utilization efficiency to varying vegetations and to increasing temperature emphasizes the need for further research in volcanic forest soils. We have studied responses of soil microbial biomass C (MBC) concentrations and metabolic quotients (qCO2, CO2-C/biomass-C) to vegetations and temperature in temperate volcanic forest soils. Soils were sampled in April and October 2003 beneath four forest stands in close proximity (200 m apart) in central Japan: a Japanese cedar coniferous forest (CI), a pine coniferous forest (CII), and an oak-dominated hardwood on a grading and steep slope (DI and DII). The soil MBC concentrations and qCO2values beneath each forest stand were measured under oxic conditions, along with the effect of temperature and the long-term storage at low temperature on both variables. Comparing different forest stands, it was indicated that the pine forest soil always showed the lowest MBC concentration relative to soil total C, and the largest qCO2(P<0.05), suggesting that microbial communities in the soil were less efficient in C use than communities in the other forest soils. Under a same oak-dominated hardwood, a steep terrain induced a lower soil respiration and MBC concentration, but qCO2values of both soils had no significant differences at 25 °C. The MBC concentration in the soils beneath each forest stand mostly had no differences during two sampling periods. The low-temperature storage induced an increase in soil MBC and a reduction of CO2production, reducing the qCO2. There was a smaller MBC concentration in the CII soil than in the CI and DII soil within the range of 5 to 35 °C; the MBC concentration and qCO2in the DI and CII soil appeared more sensitive at increasing temperature than those in the DII and CI soil. From the results obtained, it can be concluded that under similar climatic conditions and soil types, the MBC concentrations and qCO2values of temperate volcanic forest soils vary with tree species and temperature, and that the high soil C-to-N ratios and low acidity can contribute to decreased soil MBC concentration and to increased qCO2.