Leaf Decay Processes during and after a Supra‐Seasonal Hydrological Drought in a Temperate Lowland Stream

Leaf Decay Processes during and after a Supra‐Seasonal Hydrological Drought in a Temperate Lowland Stream
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温带低地溪流超季节水文干旱期间和之后的叶子腐烂过程

DOI:
10.1002/iroh.201111322
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发表时间:
2011
影响因子:
1.9
通讯作者:
Schlief
Schlief
中科院分区:
生物学4区
文献类型:
--
作者:
Schlief

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中欧的气候变化模型预测了水文干旱,在许多低地溪流的高凋落物输入期间,水文干旱会破碎成池,可能会影响溪流中的树叶腐烂过程。为了研究这一假设,我们测量了德国低地溪流中超季节干旱期间和之后暴露叶片的理化参数、大型无脊椎动物定植、微生物活性和腐烂率。碎片化过程中的微生物活动、碎纸机定植和叶片腐烂率较低,可能是由干旱相关的环境条件造成的。微生物活性和温度校正的衰减率增加后,流动恢复,但不是叶片质量损失和粉碎机殖民。在这两个时期,暴露的叶子似乎在物理上不受影响,这表明尽管存在切碎机,但切碎机介导的叶子腐烂强烈减少。我们的研究结果表明,水文干旱可以影响生物和过程中的温带低地流,即使在流量恢复,并应考虑在气候变化情景。(© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA,魏因海姆)
Climate change models for Central Europe predict hydrological drought with fragmentation into pools during periods of high litter input in numerous lowland streams, presumably affecting in‐stream leaf decay processes. To investigate this assumption, we measured physicochemical parameters, macro‐invertebrate colonization, microbial activity, and decay rates of exposed leaves during and after a supra‐seasonal drought in a German lowland stream. Microbial activity, shredder colonization and leaf decay rates during fragmentation were low, presumably caused by drought‐related environmental conditions. Microbial activity and temperature‐corrected decay rates increased after the flow resumption but not leaf mass loss and shredder colonization. During both periods, exposed leaves appeared physically unaffected suggesting strongly reduced shredder‐mediated leaf decay despite shredder presence. Our results indicate that hydrological drought can affect organisms and processes in temperate lowland streams even after flow resumption, and should be considered in climate change scenarios. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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