Microbial communities, biomass, and activities in soils as affected by freeze thaw cycles
Microbial communities, biomass, and activities in soils as affected by freeze thaw cycles
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DOI：
10.1016/j.soilbio.2005.12.010
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发表时间：
2006-07-01
影响因子：
9.7
通讯作者：
Martikainen, Pertti J.
中科院分区：
文献类型：
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作者：
Koponen, Hannu T.;Jaakkola, Tuula;Martikainen, Pertti J.
两种芬兰农业土壤（泥炭土和沃土砂）暴露于四次冻融循环（FTC），温度变化从-17.3 +/- 0.4摄氏度到+4.1 +/- 0.4摄氏度。将来自两种土壤的对照芯保持在恒定温度（+6.6 +/-2.0 ° C）下而不使用FTCs。通过对土壤解冻过程中N2 O和CO2排放的监测，研究了FTCs对土壤微生物的影响。N2 O排放量极低的泥炭土，可能是由于土壤含水量低。壤质砂土的N2 O排放量较高，第二次施肥后排放量最高。土壤冻融增加厌氧呼吸在这两种土壤类型在第一个3-4 FTCs，这种增加是较高的泥炭土。微生物群落结构和生物量分析与脂质生物标志物（磷脂脂肪酸，3-和2-羟基脂肪酸）不受冻融循环，也不是土壤微生物生物量碳（MIB-C）。温度梯度凝胶电泳（TGGE）的微生物群落结构的分子分析也表明没有变化，由于FTCs。这些结果表明，冻融的寒带土壤不会有很大的影响微生物生物量或群落结构。(c)2006爱思唯尔有限公司保留所有权利。
Two Finnish agricultural soils (peat soil and loamy sand) were exposed to four freeze-thaw cycles (FTC), with a temperature change from -17.3 +/- 0.4 degrees C to +4.1 +/- 0.4 degrees C. Control cores from both soils were kept at constant temperature (+6.6 +/- 2.0 degrees C) without FTCs. Soil N2O and CO2 emissions were monitored during soil thawing, and the effects of FTCs on soil microbes were studied. N2O emissions were extremely low in peat soil, possibly due to low soil water content. Loamy sand had high N2O emission, with the highest emission after the second FTC. Soil freeze-thaw increased anaerobic respiration in both soil types during the first 3-4 FTCs, and this increase was higher in the peat soil. The microbial community structure and biomass analysed with lipid biomarkers (phospholipid fatty acids, 3- and 2- hydroxy fatty acids) were not affected by freezing-thawing cycles, nor was soil microbial biomass carbon (MIB-C). Molecular analysis of the microbial community structure with temperature gradient gel electrophoresis (TGGE) also showed no changes due the FTCs. These results show that freezing and thawing of boreal soils does not have a strong effect on microbial biomass or community structure. (c) 2006 Elsevier Ltd. All rights reserved.