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Environmental heterogeneity affects input, storage, and transformation of coarse particulate organic matter in a floodplain mosaic

机译：环境异质性影响洪泛区马赛克中粗颗粒有机物的输入，存储和转化

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摘要

Quantifying spatial and temporal dynamics of organic matter (OM) is critical both for understanding ecosystem functioning and for predicting impacts of landscape change. To determine the influence of different habitats and coarse particulate OM (CPOM) types upon floodplain OM dynamics, we quantified aerial input, lateral surface transfer, and surface storage of CPOM over an annual cycle on the near-natural floodplain of the River Tagliamento in NE-Italy. Using these data, we modelled floodplain leaf dynamics, taking account of the spatial distribution and hydrologic connectivity of habitats, and using leaf storage as a response variable. Mean aerial CPOM input to the flood-plain was similar from riparian forest and islands, but surface transfer was greater from islands, supporting the suggestion that these habitats act as "islands of fertility" along braided rivers. Leaves were the lateral conveyor of energy to more open parts of the floodplain, whereas CPOM was mainly stored as small wood in vegetated islands and riparian forest. Simulating the loss of habitat diversity (islands, ponds) decreased leaf storage on the whole floodplain, on exposed gravel and in large wood accumulations. In contrast, damming (loss of islands, ponds and floods plus floodplain overgrowth) greatly increased storage on exposed gravel. A random shuffle of habitats led to a storage increase on exposed gravel, while that in large wood accumulations and ponds declined. These results disentangle some of the complexities of CPOM dynamics in floodplain ecosystems, illustrate the value of models in understanding-ecosystem functioning at a landscape level, and directly inform river management practice.
机译：量化有机物（OM）的时空动态对于理解生态系统功能和预测景观变化的影响都至关重要。为了确定不同生境和粗粒有机质（CPOM）类型对洪泛区OM动态的影响，我们量化了东北地区塔利亚门托河近自然洪泛区的空气输入量，侧向表面转移和CPOM的年度存储量-意大利。使用这些数据，我们对洪泛区叶片动力学建模，考虑了栖息地的空间分布和水文连通性，并使用叶片储藏作为响应变量。向河漫滩的平均空中CPOM输入与河岸森林和岛屿相似，但从岛屿的表层转移更大，这支持了这些生境在辫状河流上起着“肥沃之岛”的作用。叶子是能量的横向输送带，流向洪泛区的更开放的部分，而CPOM主要作为小木料存储在有植被的岛屿和河岸森林中。模拟栖息地多样性（岛屿，池塘）的丧失，减少了整个洪泛区，裸露的砾石和大量木材积聚处的叶片储藏量。相比之下，筑坝（岛屿，池塘和洪水的损失加上洪泛区的过度生长）大大增加了裸露砾石的储存量。栖息地的随机变化导致裸露的砾石的存储量增加，而大型木材堆积物和池塘的存储量则减少。这些结果消除了洪泛区生态系统中CPOM动态的某些复杂性，说明了模型在景观水平上理解生态系统功能中的价值，并直接为河流管理实践提供了信息。

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  • 来源
    《Aquatic Sciences》 |2013年第3期|335-348|共14页
  • 作者

    Simone Daniela Langhans; Urs Richard; Janine Rueegg; Urs Uehlinger; Peter Edwards; Michael Doering; Klement Tockner;

  • 作者单位

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland,Institute of Integrative Biology,ETH Zurich, 8092 Zurich, Switzerland,Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12587 Berlin, Germany;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland,Institute of Integrative Biology,ETH Zurich, 8092 Zurich, Switzerland,stadtlandfluss GmbH, Scheuchzerstr. 8, 8006 Zurich, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland,Institute of Integrative Biology,ETH Zurich, 8092 Zurich, Switzerland,Division of Biology, Kansas State University, Manhattan, KS 66506, USA;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland,Institute of Integrative Biology,ETH Zurich, 8092 Zurich, Switzerland;

    Institute of Integrative Biology (IBZ), Swiss Federal Institute of Technology, ETH Zentrum, Universitaesstrasse, 16, CHN, 8092 Zuerich, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland,Institute of Integrative Biology,ETH Zurich, 8092 Zurich, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dubendorf, Switzerland,Institute of Integrative Biology,ETH Zurich, 8092 Zurich, Switzerland,Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12587 Berlin, Germany,Institute of Biology, Freie Universitat Berlin, Berlin, Germany;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tagliamento; Leaf decomposition; Ecosystem modelling; Flood pulse; Hydrological connectivity; Organic matter dynamics;

    机译：塔利亚门托叶片分解;生态系统建模;洪水脉冲水文连通性;有机物动力学;

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