Forest soil respiration and its heterotrophic and autotrophic components: Global patterns and responses to temperature and precipitation
Forest soil respiration and its heterotrophic and autotrophic components: Global patterns and responses to temperature and precipitation
复制标题
森林土壤呼吸及其异养和自养成分：全球模式以及对温度和降水的响应。
DOI：
10.1016/j.soilbio.2010.04.013
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发表时间：
2010-08-01
影响因子：
9.7
通讯作者：
Wang Shaopeng
中科院分区：
文献类型：
--
作者：
Wang Wei;Chen Weile;Wang Shaopeng
量化全球森林土壤呼吸(SR)及其异养呼吸(FIR)和地下自养呼吸(AR)的组成及其对温度和降水的响应对于准确评估陆地碳平衡对未来气候变化的响应至关重要。SR对气候变化的反应存在很大的不确定性，涉及气候控制和表观Q(10)(气温升高10摄氏度时呼吸增加的因素)与HR和AR之间的差异。在这里，我们从一个不同的全球森林生态系统数据库中审查关于SR、HR、AR、HR对SR的贡献(HR/SR)以及SR及其组成部分的Q(10)的可用信息。其目的是测试SR及其两个分量(AR和FIR)对温度和降水变化的反应，并测试AR和HR之间表观Q(10)的差异。在天然更新林中，SR随年平均温度(MAT)呈线性增加，而对年平均降水量(MAP)呈非线性响应。MAT每升高1摄氏度，SR的总排放量就增加24.6g Cm(-2)Yr(-1)。当MAP<813 mm时，MAP每增加100 mm，释放量为75.3gCm(-2)yr(-1)；当MAP大于813 mm时，释放量增加幅度降至20.3gCm(-2)yr(-1)。MAT可解释AR的变异小于HR的变异。在MAT中，AR和HR的总排放量每增加1摄氏度，分别增加12.9g Cm(-2)Yr(-1)和16.1g Cm(-2)Yr(-1)。MAP每增加100 mm AR排放，当MAP小于1000 mm时，AR排放增加44.5g Cm(-2)Yr(-1)。然而，在门槛之上。AR排放量相对保持不变。土壤温度每增加100 mm，HR线性增加15.0gCm(-2)yr(-1)，SR的Q(10)值随测温深度的增加而增大，与HR/SR呈负相关。我们的合成表明AR和HR对温度和降水变化的反应不同。我们还强调了在将Q(10)值的现场估计应用于当前陆地生态系统模型时，土壤温度测量深度信息的重要性。从包括AR在内的实地SR测量得出的Q(10)值可能会高估未来地球变暖时HR的温度响应。(C)2010爱思唯尔有限公司。保留所有权利。
Quantifying global patterns of forest soil respiration (SR), its components of heteroteophic respiration (FIR) and belowground autotrophic respiration (AR), and their responses to temperature and precipitation are vital to accurately evaluate responses of the terrestrial carbon balance to future climate change. There is great uncertainty associated with responses of SR to climate change, concerning the differences in climatic controls and apparent Q(10) (the factor by which respiration increases for a 10 degrees C increase in temperature) over HR and AR. Here, we examine available information on SR, HR, AR, the contribution of HR to SR (HR/SR), and Q(10) of SR and its components from a diverse global database of forest ecosystems. The goals were to test how SR and its two components (AR and FIR) respond to temperature and precipitation changes, and to test the differences in apparent Q(10) between AR and HR. SR increased linearly with mean annual temperature (MAT), but responded non-linearly to mean annual precipitation (MAP) in naturally-regenerated forests. For every 1 degrees C increase in MAT, overall emissions from SR increased by 24.6 g C m(-2) yr(-1). When MAP was less than 813 mm, every 100 mm increase in MAP led to a release of 75.3 g C m(-2) yr(-1), but the increase rate declined to 20.3 g C m(-2) yr(-1) when MAP was greater than 813 mm. MAT explained less variation in AR than that in HR. The overall emissions in AR and HR for every 1 degrees C increase in MAT, increased by 12.9 and 16.1 g C m(-2) yr(-1), respectively. The AR emissions for every 100 mm increase in MAP, increased by 44.5 g C m(-2) yr(-1) when MAP less than 1000 mm. However, above the threshold. AR emissions stayed relatively constant. HR increased linearly by 15.0 g C m(-2) yr(-1) with every 100 mm increased in MAR The Q(10) value of SR increased with increasing depth at which soil temperature was measured up to 10 cm and was negatively correlated with HR/SR. Our synthesis suggests AR and HR differ in their responses to temperature and precipitation change. We also emphasized the importance of information on soil temperature measurement depth when applying field estimation of Q(10) values into current terrestrial ecosystem models. Q(10) values derived from field SR measurements including AR, will likely overestimate the temperature response of HR on a future warmer earth. (c) 2010 Elsevier Ltd. All rights reserved.