Land use not litter quality is a stronger driver of decomposition in hyperdiverse tropical forest.
Land use not litter quality is a stronger driver of decomposition in hyperdiverse tropical forest.
复制标题
DOI：
10.1002/ece3.3460
复制
发表时间：
2017-11
影响因子：
2.6
通讯作者：
Johnson D
中科院分区：
文献类型：
--
作者：
Both S;Elias DMO;Kritzler UH;Ostle NJ;Johnson D
在高度多样化的热带森林中，人们对凋落物分解的关键驱动因素知之甚少，尽管它在促进植物和微生物获得养分方面发挥着至关重要的作用。选择性采伐是一种紧迫的土地利用方式，可能对植物-土壤相互作用、凋落物分解和养分循环产生重大影响。在婆罗洲的热带雨林中，我们测试了分解是由凋落物质量驱动的假设，以及存在显著的“主场优势”，即当地凋落物质量和土地利用之间的积极互动。我们采用全因子实验设计，采用允许或阻止中系动物进入的网格，测定了从选择性采伐和老生长林收集的凋落叶的质量损失。我们在实验前后测量了凋落叶的化学成分。主要土壤化学和生物特性以及小气候条件作为土地利用描述符进行测量。研究发现，尽管凋落物质量存在显著差异，但导致凋落物分解的主要因素是土地利用类型。虽然中系动物的加入加速了分解，但它们的作用与土地利用和凋落物质量无关。选择性采伐林凋落物的分解速度比原生林慢。然而，在选择性采伐的森林中，凋落物的养分损失明显更大，尤其是磷。对几个协变量的分析发现，不同土地利用类型之间存在微小的小气候差异，但土壤化学性质或自由生活的微生物组成没有变化。这些结果表明，选择性采伐可以显著减少热带雨林凋落物的分解，而没有证据表明有主场优势。研究表明，在选择性采伐的森林中，凋落物中关键限制性营养物质（P和N）的损失更大。总体而言，研究结果表明，小气候影响凋落物质量的细微差异导致选择性砍伐森林的分解率降低，并可能长期影响生物地球化学养分循环。
In hyperdiverse tropical forests, the key drivers of litter decomposition are poorly understood despite its crucial role in facilitating nutrient availability for plants and microbes. Selective logging is a pressing land use with potential for considerable impacts on plant–soil interactions, litter decomposition, and nutrient cycling. Here, in Borneo's tropical rainforests, we test the hypothesis that decomposition is driven by litter quality and that there is a significant “home‐field advantage,” that is positive interaction between local litter quality and land use. We determined mass loss of leaf litter, collected from selectively logged and old‐growth forest, in a fully factorial experimental design, using meshes that either allowed or precluded access by mesofauna. We measured leaf litter chemical composition before and after the experiment. Key soil chemical and biological properties and microclimatic conditions were measured as land‐use descriptors. We found that despite substantial differences in litter quality, the main driver of decomposition was land‐use type. Whilst inclusion of mesofauna accelerated decomposition, their effect was independent of land use and litter quality. Decomposition of all litters was slower in selectively logged forest than in old‐growth forest. However, there was significantly greater loss of nutrients from litter, especially phosphorus, in selectively logged forest. The analyses of several covariates detected minor microclimatic differences between land‐use types but no alterations in soil chemical properties or free‐living microbial composition. These results demonstrate that selective logging can significantly reduce litter decomposition in tropical rainforest with no evidence of a home‐field advantage. We show that loss of key limiting nutrients from litter (P & N) is greater in selectively logged forest. Overall, the findings hint at subtle differences in microclimate overriding litter quality that result in reduced decomposition rates in selectively logged forests and potentially affect biogeochemical nutrient cycling in the long term.
登录
查看更多内容
影响因子：
64.8
作者：
GADGIL, RL;GADGIL, PD
通讯作者：
GADGIL, PD
影响因子：
4.8
作者：
Craine, Joseph M.;Morrow, Carl;Fierer, Noah
通讯作者：
Fierer, Noah
影响因子：
8.8
作者：
Cornwell, William K.;Cornelissen, Johannes H. C.;Westoby, Mark
通讯作者：
Westoby, Mark
影响因子：
9.4
作者：
Cornelissen, JHC;Pérez-Harguindeguy, N;Cerabolini, B
通讯作者：
Cerabolini, B
DOI：
10.1098/rstb.2011.0049
发表时间：
2011-11-27
影响因子：
6.3
作者：
Ewers, Robert M.;Didham, Raphael K.;Turner, Edgar C.
通讯作者：
Turner, Edgar C.