Litter input decreased the response of soil organic matter decomposition to warming in two subtropical forest soils.
Litter input decreased the response of soil organic matter decomposition to warming in two subtropical forest soils.
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凋落物输入降低了两种亚热带森林土壤中土壤有机质分解对变暖的响应
DOI：
10.1038/srep33814
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发表时间：
2016-09-20
影响因子：
4.6
通讯作者：
Liu J
中科院分区：
文献类型：
--
作者：
Wang Q;He T;Liu J
温度和凋落物输入对土壤有机质分解的交互作用尚不清楚，制约了全球变暖背景下土壤有机碳动态和储量的准确预测。为了解决这一知识缺口，我们进行了培养实验，将13 C标记的落叶添加到针叶林（CF）和阔叶林（BF）土壤中。本试验研究了土壤有机质分解的温度敏感性（Q10）对凋落物输入量增加的响应。分析了引发效应和土壤微生物群落的温度依赖性。CF土壤的Q10从无凋落物处理的2.41显著降低到添加凋落物处理的2.05，BF土壤的Q10从2.14显著降低到1.82，表明凋落物的添加降低了Q10。CF土壤中的PE在20 °C时为24.9%，在30 °C时为6.2%，BF土壤中的PE在20 °C时为8.8%，在30 °C时为−7.0%，表明PE随温度升高而降低。相对PE与革兰阴性菌和真菌PLFA浓度呈正相关。本研究通过揭示凋落物输入与气候变暖对土壤碳循环的交互作用，进一步认识气候变暖对森林碳循环的影响。
Interaction effect of temperature and litter input on SOM decomposition is poor understood, restricting accurate prediction of the dynamics and stocks of soil organic carbon under global warming. To address this knowledge gap, we conducted an incubation experiment by adding13C labeled leaf-litter into a coniferous forest (CF) soil and a broadleaved forest (BF) soil. In this experiment, response of the temperature sensitivity (Q10) of SOM decomposition to the increase in litter input was investigated. The temperature dependences of priming effect (PE) and soil microbial community were analyzed. TheQ10for CF soil significantly decreased from 2.41 in no-litter treatment to 2.05 in litter-added treatment and for BF soil from 2.14 to 1.82, suggesting that litter addition decreases theQ10. PE in the CF soil was 24.9% at 20 °C and 6.2% at 30 °C, and in the BF soil the PE was 8.8% at 20 °C and −7.0% at 30 °C, suggesting that PE decreases with increasing temperature. Relative PE was positively related to the concentrations of Gram-negative bacterial and fungal PLFAs. This study moves a step forward in understanding warming effect on forest carbon cycling by highlighting interaction effect of litter input and warming on soil carbon cycling.
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