Litter quality versus soil microbial community controls over decomposition: a quantitative analysis

被引:177
作者
Cleveland, Cory C. [1 ]
Reed, Sasha C. [2 ]
Keller, Adrienne B. [1 ]
Nemergut, Diana R. [3 ,4 ]
O'Neill, Sean P. [3 ,4 ]
Ostertag, Rebecca [5 ]
Vitousek, Peter M. [6 ]
机构
[1] Univ Montana, Dept Ecosyst & Conservat Sci, Missoula, MT 59812 USA
[2] US Geol Survey, Southwest Biol Sci Ctr, Moab, UT 84532 USA
[3] Univ Colorado, Inst Arct & Alpine Res, Boulder, CO 80309 USA
[4] Univ Colorado, Environm Studies Program, Boulder, CO 80309 USA
[5] Univ Hawaii, Dept Biol, Hilo, HI 96720 USA
[6] Stanford Univ, Dept Biol, Stanford, CA 94305 USA
基金
美国国家科学基金会; 美国安德鲁·梅隆基金会;
关键词
Carbon cycle; Decomposition; Ecosystem function; Global change; Microbial community; CALIFORNIA ANNUAL GRASSLAND; ELEVATED CO2; FUNCTIONAL-SIGNIFICANCE; BACTERIAL COMMUNITIES; NUTRIENT LIMITATION; PLANT DIVERSITY; LIGNIN CONTROL; NITROGEN; FOREST; ECOSYSTEM;
D O I
10.1007/s00442-013-2758-9
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The possible effects of soil microbial community structure on organic matter decomposition rates have been widely acknowledged, but are poorly understood. Understanding these relationships is complicated by the fact that microbial community structure and function are likely to both affect and be affected by organic matter quality and chemistry, thus it is difficult to draw mechanistic conclusions from field studies. We conducted a reciprocal soil inoculum x litter transplant laboratory incubation experiment using samples collected from a set of sites that have similar climate and plant species composition but vary significantly in bacterial community structure and litter quality. The results showed that litter quality explained the majority of variation in decomposition rates under controlled laboratory conditions: over the course of the 162-day incubation, litter quality explained nearly two-thirds (64 %) of variation in decomposition rates, and a smaller proportion (25 %) was explained by variation in the inoculum type. In addition, the relative importance of inoculum type on soil respiration increased over the course of the experiment, and was significantly higher in microcosms with lower litter quality relative to those with higher quality litter. We also used molecular phylogenetics to examine the relationships between bacterial community composition and soil respiration in samples through time. Pyrosequencing revealed that bacterial community composition explained 32 % of the variation in respiration rates. However, equal portions (i.e., 16 %) of the variation in bacterial community composition were explained by inoculum type and litter quality, reflecting the importance of both the meta-community and the environment in bacterial assembly. Taken together, these results indicate that the effects of changing microbial community composition on decomposition are likely to be smaller than the potential effects of climate change and/or litter quality changes in response to increasing atmospheric CO2 concentrations or atmospheric nutrient deposition.
引用
收藏
页码:283 / 294
页数:12
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