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Comparison of leaf decomposition and macroinvertebrate colonization between exotic and native trees in a freshwater ecosystem

机译：淡水生态系统中外来树种和本土树种叶片分解和大型无脊椎动物定殖的比较

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摘要

One of the most important sources of energy in aquatic ecosystems is the allochthonous input of detritus. Replacement of native tree species by exotic ones affects the quality of detritus entering freshwater ecosystems. This replacement can alter nutrient cycles and community structure in aquatic ecosystems. The aims of our study were (1) to compare leaf litter decomposition of two widely distributed exotic species (Ailanthus altissima and Robinia pseudoacacia) with the native species they coexist with (Ulmus minor and Fraxinus angustifolia), and (2) to compare macroinvertebrate colonization among litters of the invasive and native species. Litter bags of the four tree species were placed in the water and collected every 2, 25, 39, 71, and 95 days in a lentic ecosystem. Additionally, the macroinvertebrate community on litter bags was monitored after 25, 39, and 95 days. Several leaf chemistry traits were measured at the beginning (% lignin; lignin:N, C:N, LMA) and during the study (leaf total nitrogen). We detected variable rates of decomposition among species (k values of 0.009, 0.008, 0.008, and 0.005 for F. angustifolia, U. minor, A. altissima and R. pseudoacacia, respectively), but we did not detect an effect of litter source (from native/exotic). In spite of its low decay, the highest leaf nitrogen was found in R. pseudoacacia litter. Macroinvertebrate communities colonizing litter bags were similar across species. Most of them were collectors (i.e., they feed on fine particulate organic matter), suggesting that leaf material of either invasive or native trees was used as substrate both for the animals and for the organic matter they feed on. Our results suggest that the replacement of the native Fraxinus byrnRobinia would imply a reduction in the rate of leaf processing and also a slower release of leaf nitrogen to water.
机译：水生生态系统中最重要的能源之一是碎屑的异源输入。外来物种取代本地树种会影响进入淡水生态系统的碎屑的质量。这种替代可以改变水生生态系统中的养分循环和群落结构。我们研究的目的是（1）比较两种分布广泛的外来物种（臭椿（Ailanthus altissima）和刺槐（Robinia pseudoacacia））与它们共存的本地物种（小榆（Ulmus minor）和白蜡树（Fraxinus angustifolia））的凋落物分解，以及（2）比较大型无脊椎动物定居在入侵和本地物种的凋落物之间。将四种树木的垃圾袋放入水中，每2、25、39、71和95天收集一次，放在一个lentic生态系统中。此外，在25、39和95天后对垃圾袋上的大型无脊椎动物群落进行了监测。在开始时（％木质素；木质素：N，C：N，LMA）和研究期间（叶片总氮）测量了几种叶片的化学特性。我们检测到物种间的分解速率不同（F. angustifolia，U。minor，A。altissima和R. pseudoacacia的k值分别为0.009、0.008、0.008和0.005），但未检测到凋落物来源的影响（来自本地/外来）。尽管其腐烂程度很低，但在拟金丝桃凋落物中却发现了最高的叶氮。遍布垃圾袋的大型无脊椎动物群落在物种之间相似。它们中的大多数是收集者（即，它们以细颗粒的有机物为食），表明入侵性树种或天然树的叶子材料既用作动物又作为它们饲养的有机物的底物。我们的研究结果表明，用刺槐替代天然水曲柳意味着叶片加工速度的降低，以及叶片氮素向水中的释放较慢。

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  • 来源
    《Ecological research》 |2010年第3期|P.647-653|共7页
  • 作者

    A. Alonso; N. Gonzalez-Munoz; P. Castro-Diez;

  • 作者单位

    Department of Ecology, Faculty of Biology, University of Alcala, 28871 Alcala de Henares, Madrid, Spain Aquatic Ecology and Water Quality Management Group, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands;

    rnDepartment of Ecology, Faculty of Biology, University of Alcala, 28871 Alcala de Henares, Madrid, Spain;

    rnDepartment of Ecology, Faculty of Biology, University of Alcala, 28871 Alcala de Henares, Madrid, Spain;

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  • 正文语种 eng
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  • 关键词

    invasive species; leaf litter decay; community; nitrogen; lignin;

    机译：入侵物种;枯枝落叶社区;氮;木质素;

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