Microbial community structure mediates response of soil C decomposition to litter addition and warming
Microbial community structure mediates response of soil C decomposition to litter addition and warming
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DOI：
10.1016/j.soilbio.2014.10.008
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发表时间：
2015-01-01
影响因子：
9.7
通讯作者：
Farrell, Mark
中科院分区：
文献类型：
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作者：
Creamer, Courtney A.;de Menezes, Alexandre B.;Farrell, Mark
微生物活动已被强调为控制土壤有机质（SUM）的命运和周转的主要未知因素之一，以应对气候变化。微生物群落结构和功能如何可能（或可能不）与温度升高相互作用，影响SUM的命运和营业额，特别是当与凋落物化学变化相结合时，尚不清楚。本研究的主要目的是确定凋落物化学是否影响土壤和凋落物衍生碳（C）的分解及其与温度的相互作用，以及这种反应是否受微生物群落结构和功能的控制。将新鲜或预孵育的桉树叶凋落物（富含C-13）添加到林地土壤中，并在12、22或32 ℃下孵育。我们跟踪运动的凋落物和土壤来源的碳转化为二氧化碳，水提取的有机碳（WEOC），和微生物磷脂（PLFA）。凋落物添加产生显着的变化，在每一个参数测量，而温度，与凋落物化学相互作用，主要影响土壤碳呼吸（启动和温度敏感性），微生物群落结构，和代谢商（微生物碳利用效率[CUE]的代理）。引发的方向不同的垃圾添加（负与新鲜的垃圾，积极与预孵育的垃圾），并与微生物群落的组成的差异降解土壤-C，特别是革兰氏阳性和革兰氏阴性细菌，导致从垃圾添加。两种凋落物处理的土壤碳分解对温度更敏感（Q（10）更高），土壤碳启动随温度的升高而增加。然而，微生物利用土壤-C在凋落物处理有较高的CUE，这表明土壤-C的长期稳定性可能会增加在较高的温度与凋落物添加。我们的研究结果表明，在同一土壤中，不同微生物群落的生长可以改变SUM的营业额和命运，并在全球变化的背景下，其对温度的反应。(C)2014爱思唯尔有限公司版权所有。
Microbial activity has been highlighted as one of the main unknowns controlling the fate and turnover of soil organic matter (SUM) in response to climate change. How microbial community structure and function may (or may not) interact with increasing temperature to impact the fate and turnover of SUM, in particular when combined with changes in litter chemistry, is not well understood. The primary aim of this study was to determine if litter chemistry impacted the decomposition of soil and litter-derived carbon (C), and its interaction with temperature, and whether this response was controlled by microbial community structure and function. Fresh or pre-incubated eucalyptus leaf litter (C-13 enriched) was added to a woodland soil and incubated at 12, 22, or 32 degrees C. We tracked the movement of litter and soil-derived C into CO2, water-extractable organic carbon (WEOC), and microbial phospholipids (PLFA). The litter additions produced significant changes in every parameter measured, while temperature, interacting with litter chemistry, predominately affected soil C respiration (priming and temperature sensitivity), microbial community structure, and the metabolic quotient (a proxy for microbial carbon use efficiency [CUE]). The direction of priming varied with the litter additions (negative with fresh litter, positive with pre-incubated litter) and was related to differences in the composition of microbial communities degrading soil-C, particularly gram-positive and gram-negative bacteria, resulting from litter addition. Soil-C decomposition in both litter treatments was more temperature sensitive (higher Q(10)) than in the soil-only control, and soil-C priming became increasingly positive with temperature. However, microbes utilizing soil-C in the litter treatments had higher CUE, suggesting the longer-term stability of soil-C may be increased at higher temperature with litter addition. Our results show that in the same soil, the growth of distinct microbial communities can alter the turnover and fate of SUM and, in the context of global change, its response to temperature. (C) 2014 Elsevier Ltd. All rights reserved.