The sensitivity of tropical leaf litter decomposition to temperature: results from a large-scale leaf translocation experiment along an elevation gradient in Peruvian forests
The sensitivity of tropical leaf litter decomposition to temperature: results from a large-scale leaf translocation experiment along an elevation gradient in Peruvian forests
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DOI：
10.1111/j.1469-8137.2010.03521.x
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发表时间：
2011-01-01
期刊：
影响因子：
9.4
通讯作者：
Farfan, F.
中科院分区：
文献类型：
--
作者：
Salinas, N.;Malhi, Y.;Farfan, F.
我们提出的结果，从凋落物易位实验沿着2800米的海拔梯度在秘鲁热带森林。研究结果表明，凋落物的分解速率（k）受植物种类的影响较大，但随着温度的升高，凋落物的分解速率（k）逐渐降低，而凋落物的分解速率（k）随植物种类的增加而增加，随着温度的升高，凋落物的分解速率逐渐降低。最可能是通过其对叶片质量和形态的影响。当样品被汇集在不同物种和海拔高度，土壤温度解释了95%的分解率的变化，但没有直接的关系，观察到与土壤水分或降雨。衰变率对温度的敏感性（kappa（T））在不同物种之间变化7倍，在0.024和0.169摄氏度之间，平均值为0.118 +/- 0.009摄氏度（SE）。这相当于凋落物分解的温度敏感性参数（Q（10））为3.06 +/- 0.28，高于异养过程通常假设的温度敏感性参数。0.9近几十年来该地区经历的摄氏度可能增加了分解和营养矿化率。百分之十
We present the results from a litter translocation experiment along a 2800-m elevation gradient in Peruvian tropical forests. The understanding of the environmental factors controlling litter decomposition is important in the description of the carbon and nutrient cycles of tropical ecosystems, and in predicting their response to long-term increases in temperature.Samples of litter from 15 species were transplanted across all five sites in the study, and decomposition was tracked over 448 d.Species' type had a large influence on the decomposition rate (k), most probably through its influence on leaf quality and morphology. When samples were pooled across species and elevations, soil temperature explained 95% of the variation in the decomposition rate, but no direct relationship was observed with either soil moisture or rainfall. The sensitivity of the decay rate to temperature (kappa(T)) varied seven-fold across species, between 0.024 and 0.169 degrees C-1, with a mean value of 0.118 +/- 0.009 degrees C-1 (SE). This is equivalent to a temperature sensitivity parameter (Q(10)) for litter decay of 3.06 +/- 0.28, higher than that frequently assumed for heterotrophic processes.Our results suggest that the warming of approx. 0.9 degrees C experienced in the region in recent decades may have increased decomposition and nutrient mineralization rates by c. 10%.