Litter decomposition rates across tropical montane and lowland forests are controlled foremost by climate-猫眼课题宝

DOI：

10.1111/btp.13044

发表时间：

2021-12

期刊：

Biotropica

影响因子：

2.1

通讯作者：

中科院分区：

环境科学与生态学3区

文献类型：

作者：

R. Ostertag;C. Restrepo;J. Dalling;PA Martin;Iveren Abiem;Shin‐ichiro Aiba;Esteban Alvarez-Davila;R. Aragón;Michelle Ataroff;H. Chapman;A. Cueva-Agila;B. Fadrique;R. Fernández;G. González;S. Gotsch;A. Häger;J. Homeier;Carlos Iñiguez‐Armijos;L. Llambí;G. Moore;R. R. Næsborg-R.;Laura Nohemy Poma López;P. Pompeu;Jennifer R. Powell;Jorge Andrés Ramírez Correa;Klara Scharnagl;C. Tobón;C. Williams

“因素层次”假说指出，分解率主要受气候控制，其次是生物和土壤变量。热带山地森林是全球重要的生态系统，但提供凋落物分解生物群落尺度特征的努力有限。我们设计了一个共同的凋落物分解实验复制在23个热带山地网站在美洲，亚洲和非洲，并结合这些结果与以前的研究23个网站在热带低地森林（TLF）。具体而言，我们调查了（1）分解的空间异质性，（2）生物因素的相对重要性，影响叶和木材分解的芦苇，（3）气候在确定落叶分解率的作用内和跨芦苇和TLF生物群系。将含有月桂树叶或桦木冰棒棒的两种网目尺寸的垃圾袋在空间上分散并在土壤表面和10-15 cm深度处的土壤中培养3个月和7个月。研究中心内复制证明了质量损失的空间变异性。凋落物类型是影响分解的主要生物学因子（树叶>木材），网状效应和埋藏效应起次要作用。当比较跨CO2和TLF，气候是分解的主要控制，但Yasso 07全球模型（基于年平均温度和降水量）只能适度预测分解率。生物群系之间的控制因素的差异表明，在发展理论和模型以阐明热带地区的碳循环速率时，必须明确考虑具有高碳储存率的热带雨林。

The “hierarchy of factors” hypothesis states that decomposition rates are controlled primarily by climatic, followed by biological and soil variables. Tropical montane forests (TMF) are globally important ecosystems, yet there have been limited efforts to provide a biome‐scale characterization of litter decomposition. We designed a common litter decomposition experiment replicated in 23 tropical montane sites across the Americas, Asia, and Africa and combined these results with a previous study of 23 sites in tropical lowland forests (TLF). Specifically, we investigated (1) spatial heterogeneity in decomposition, (2) the relative importance of biological factors that affect leaf and wood decomposition in TMF, and (3) the role of climate in determining leaf litter decomposition rates within and across the TMF and TLF biomes. Litterbags of two mesh sizes containing Laurus nobilis leaves or birchwood popsicle sticks were spatially dispersed and incubated in TMF sites, for 3 and 7 months on the soil surface and at 10–15 cm depth. The within‐site replication demonstrated spatial variability in mass loss. Within TMF, litter type was the predominant biological factor influencing decomposition (leaves > wood), with mesh and burial effects playing a minor role. When comparing across TMF and TLF, climate was the predominant control over decomposition, but the Yasso07 global model (based on mean annual temperature and precipitation) only modestly predicted decomposition rate. Differences in controlling factors between biomes suggest that TMF, with their high rates of carbon storage, must be explicitly considered when developing theory and models to elucidate carbon cycling rates in the tropics.

Litter decomposition rates across tropical montane and lowland forests are controlled foremost by climate

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