《Wetlands》杂志刊登“美国阿拉斯加州铜河三角洲湿地池塘中凋落物分解与相关无脊椎动物群落的关系”

作者：Scott D. Tiegs,  Sally A. Entrekin, Gordon H. Reeves, Deyna Kuntzsch, Richard W. Merritt

刊物：《Wetlands》,2013年12月

关键词：高纬度湿地；植被凋落物；树叶凋落物分解；大型无脊椎动物；湿地功能

摘要：高纬度地区湿地提供了重要的生态功能作用，许多湿地依赖于植被凋落物的分解，但是对在不同空间、常见植被物种间分解率存在差异的问题，人们了解的还比较少。我们调查了美国阿拉斯加铜河三角洲的六个湿地池塘中凋落物分解（情况）。池塘上存在三角洲常见的地貌表面：由冰川退缩和沉积形成的表面，潮间带上升导致了1964年大地震的发生。多种凋落物的分解速率相差在八倍范围内，并和磷呈r=0.63的相关关系，但和氮以及枯枝落叶碳含量没有相关关系。大型底栖动物在阔叶树种间的丰度也各不相同。当用每一天的百分比质量损失来代表凋落物降解率时，在不同池塘类型中凋落物降解率的值是一致的，然而，在每个度日的基础上，河流冲积型池塘的分解率更快。冲积池塘中的凋落物也比隆起池塘有更高的无脊椎动物丰度，这种模式由摇蚊聚集驱动。相比微生物分解，无脊椎动物活性在凋落物分解中起次要作用。结果表明，与凋落物相关的无脊椎动物群落在不同池塘类型中显示出差别，但这种差别在植物凋落物分解中显得很微小。

Authors: ScottD. Tiegs,  Sally A. Entrekin, Gordon H. Reeves, Deyna Kuntzsch, Richard W. Merritt

Journal: Wetland, December 2013

Key words:High-latitudewetlands;Plantlitter;Leaf-litter breakdown;

Macroinvertebrates;Wetland functioning

Abstract: High-latitude wetlands provide vital ecological functions, many of which rely on the decomposition of plant litter, but little understanding exists of how decomposition rates vary across space, and among common plant species. We investigated the litter decomposition of seven plant species in six wetland ponds on the Copper River Delta (Alaska, USA), and the litter-associated invertebrates. The ponds exist on common geomorphic surfaces of the delta: surfaces created by glacial retreat and outwash, and those resulting from uplifted intertidal area following a powerful 1964 earthquake. An eight-fold range in decomposition rates existed across litter species and correlated with phosphorus (r = 0.63), but not nitrogen and carbon content of the litter. Macroinvertebrate abundance also differed among leaf species. Litter-decay rates did not differ between pond types when expressed on a percent-mass-loss per-day basis; however, on a per-degree-day basis, decomposition in outwash ponds was more rapid. Litter in outwash ponds also had greater invertebrate abundance than uplift ponds, a pattern driven by collector-gatherer chironomids. Invertebrate activity was deemed a minor source of litter-mass loss relative to microbial decomposition. Results suggest that litter-associated invertebrate communities differ between pond types, but that differences in plant-litter decomposition are subtle.

原文链接：http://link.springer.com/article/10.1007/s13157-013-0470-5