Microbial indicators related to soil carbon in Mediterranean land use systems
Microbial indicators related to soil carbon in Mediterranean land use systems
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DOI：
10.1016/j.still.2007.08.007
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发表时间：
2007-11-01
影响因子：
6.5
通讯作者：
Grego, S.
中科院分区：
文献类型：
--
作者：
Moscatelli, M. C.;Di Tizio, A.;Grego, S.
测定了农业、森林和草地土壤的C矿化活性和微生物指标，其特征在于两个相邻领域的不同管理：农业（常规与有机）、森林（针叶与阔叶）、草地（自然放牧与苜蓿未放牧）。研究的目的是确定土地利用和管理措施是否改变了C矿化活性和动力学，微生物生物量大小，微生物和代谢的影响因素（C-mic/C-org比值和qCO（2））。土地利用引起微生物生物量含量的显著变化，在大多数微生物指标中，农业土壤的累积CO2产量最高（300 μ gC-CO_2·g ~（-1）28 d ~（-1）），草地土壤最低（120 μ gC-CO_2·g ~（-1）28 d ~（-1））。在农业土壤中，确定了大量的潜在可矿化C（C-0）。森林土壤矿化活性主要取决于环境因子，如地上树种和土壤pH，这可能导致微生物群落结构和/或功能的变化。这也可以解释两种管理方式下两种森林土壤的化学、生物化学和微生物特性的显著差异，草地土壤具有有机质稳定性高，矿化活性低的特点。虽然两种土壤的全氮和土壤ON比率不同，但管理措施并没有影响C矿化活性。总之，结果表明，微生物介导的过程可以在很大程度上受到土地利用的影响，确认其作为土壤碳变化的重要驱动力的作用。(c)2007 Elsevier B. V.保留所有权利。
Soil C mineralization activity and microbial indices were measured in agricultural, forest and grassland soils, characterized by different managements in two adjacent fields: agricultural (conventional vs. organic), forest (conifer vs. broadleaf), grassland (naturally grazed grass vs. alfalfa ungrazed). The aim of the study was to determine if the land use and the management practices modified C mineralization activity and kinetics, microbial biomass size, microbial and metabolic quotients (C-mic/C-org ratio and qCO(2)).Land use induced significant changes in microbial biomass content, in most of the microbial indices, and in the cumulative CO2 production which showed the highest values for agricultural soils (300 mu g C-CO2 g(-1) 28 d(-1)) and the lowest for grassland soils (120 mu g C-CO2 g(-1) 28 d(-1)). In agricultural soils, a large availability of potentially mineralizable C (C-0) was determined. Forest soils mineralization activity was mainly dependent on environmental factors such as aboveground tree species and soil pH which probably induced changes in microbial community structure and/or functionality. This could also explain the significant differences found on chemical, biochemical and microbiological properties of the two forest soils under the two managements.Grassland soils were characterized by a high stability of soil organic matter (SOM) and consequently a low mineralization activity. Although total nitrogen and soil ON ratio varied between the two soils, the management practices did not affect C mineralization activity. In conclusion the results show that microbially mediated processes can be largely affected by land use confirming its role as a significant driver of soil C changes. (c) 2007 Elsevier B.V. All rights reserved.