Wood decomposition and decomposer interactions

木材分解和分解者相互作用

• 批准号: 498261908
• 负责人: Professorin Dr. Heike Feldhaar
• 金额: --
• 依托单位: Institute of Zoology
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/498261908?language=en
• 关键词: Wood; decomposition; decomposer; interactions

Feldhaar & ThornWood decomposition and decomposer interactions (SP1)Wider research context: Higher tree diversity may be beneficial to saproxylic insects by enhancing the diversity of dead wood and forest heterogeneity. By providing food and nesting space for species foraging in leaf-litter or soil, dead wood is an important link between the above- and below-ground food web.Hypotheses: Here, we propose to study saproxylic insect communities along a tree diversity gradient in the BEF-China experiment. Our main hypotheses are: (1) Tree diversity is positively correlated to the amount and diversity of dead wood, which (2) leads to an increase in (functional trait) diversity of saproxylic insect communities. (3) Higher functional trait diversity of saproxylic insect communities with increasing tree diversity has a positive effect on wood decomposition. (4) Decomposition of suspended dead wood is slower than on the ground due to differences in microclimate and vertical stratification of insect communities.Methods: We will characterize the amount and diversity of naturally occurring dead wood in all core plots to assess resource quality and availability for saproxylic insects (WP1). We will characterize the functional and taxonomic diversity of saproxylic insect communities from dead wood in all core plots. For ants and termites, we will assess species pools from leaf litter and pitfall traps (with SP3 and SP6) since the presence of predatory ants within plots may prevent other insects from colonising dead wood (WP2). In the VIP plots we will expose dead wood from four different tree species and either allow insect colonization or exclude insects. We will characterize saproxylic insect communities in relation to wood traits and will measure wood mass loss (WP3). Moreover, we will compare wood decomposition and colonization by saproxylic insects of suspended dead wood with pieces exposed on the ground, again with and without insect exclusion (WP4).Innovation: We will extend previous work by including tree diversity as a driver of saproxylic insect communities and the entailing decomposition process. We will disentangle the direct effects of tree diversity on decomposer communities from indirect effects mediated through environmental changes affecting the local species pool, thereby altering community assembly processes in dead wood or interactions between decomposers and organisms of other trophic levels.Primary researchers involved: This project will be conducted by Heike Feldhaar (PI, Uni Bayreuth) and Simon Thorn (Co-PI, Uni Würzburg), in collaboration with our Chinese partner Arong Luo (Chinese Academy of Sciences).

Feldhaar & Thorn木材分解和分解者相互作用 (SP1)更广泛的研究背景：更高的树木多样性可能通过增强死木的多样性和森林异质性而对腐木昆虫有益。通过为在落叶层或土壤中觅食的物种提供食物和筑巢空间，枯木成为地上和地下食物网之间的重要纽带。假设：在这里，我们建议在 BEF-China 实验中沿着树木多样性梯度研究腐木昆虫群落。我们的主要假设是：（1）树木多样性与枯木的数量和多样性呈正相关，（2）导致腐木昆虫群落（功能性状）多样性的增加。 (3) 随着树木多样性的增加，腐木昆虫群落的功能性状多样性较高，对木材分解有积极作用。 (4) 由于小气候和昆虫群落垂直分层的差异，悬浮死木的分解速度比地面慢。方法：我们将描述所有核心地块中自然存在的死木的数量和多样性，以评估腐木昆虫的资源质量和可用性（WP1）。我们将描述所有核心地块中枯木中腐木昆虫群落的功能和分类多样性。对于蚂蚁和白蚁，我们将评估落叶层和陷阱（SP3 和 SP6）中的物种库，因为地块内捕食性蚂蚁的存在可能会阻止其他昆虫在死木上定居（WP2）。在 VIP 地块中，我们将暴露四种不同树种的死木，并允许昆虫定植或排除昆虫。我们将描述与木材特征相关的腐木昆虫群落，并测量木材质量损失（WP3）。此外，我们将比较木材分解和腐木昆虫对悬浮死木与暴露在地面上的碎片的定植，同样有和没有排除昆虫（WP4）。创新：我们将通过将树木多样性作为腐木昆虫群落的驱动因素以及随之而来的分解过程来扩展之前的工作。我们将把树木多样性对分解者群落的直接影响与影响当地物种库的环境变化所介导的间接影响区分开来，从而改变死木中的群落组装过程或分解者与其他营养级生物之间的相互作用。主要参与研究人员：该项目将由 Heike Feldhaar（拜罗伊特大学 PI）和 Simon Thorn（拜罗伊特大学联合研究员）主持。 维尔茨堡），与我们的中国合作伙伴罗阿荣（中国科学院）合作。