Shift in the synchronisation of leaf decay processes in fragmented streams

气候变化将增加旱期和干旱，这两者都会导致过早落叶和小溪暂时碎裂成一系列水池。这种低流量或现在流量情况与凋落物输入的匹配很可能改变溪流中凋落物的腐烂。我们假设物理浸出、微生物降解和大型无脊椎动物粉碎之间的错配和特殊交互作用。我们想要通过暴露垃圾包来控制夏季干燥的溪流池塘(Alnus Visinosa(L.)Gairtn.)评估环境参数的变化，叶片质量损失率，以及微生物(真菌)和大型无脊椎动物对叶片的定植。将碎纸机排除在垃圾袋之外，将提供有关它们相对重要性的信息。在实验室中进行微宇宙实验，以分离在野外发现的因素组合(温度、渗滤液、氧气)对酶活性和微生物衰减率的影响。用白背天牛进行饲养试验，测试次生叶化合物、临界氧浓度和温度对粉碎的影响。这些结果将被合并到一个描述树叶腐烂的模型中，以及在碎片化的溪流中树叶腐烂过程同步的潜在转移。

Climate change will increase dry periods and droughts, which cause both, premature leaf fall and temporary fragmentation of small streams into a series of pools. This match of low or now flow situations with litter input is likely to alter litter decay in streams. We hypothesise mismatch and special interaction between physical leaching, microbial degradation and macroinvertebrate shredding. We want to manipulate pools of summer-dry streams by exposing litter packs (Alnus glutinosa (L.) Gaertn.) to assess the shift of environmental parameters, leaf mass loss rates, and leaf colonisation by microbes (fungi) and shredding macroinvertebrates. Exclusion of shredders from litterbags will give information on their relative importance. Microcosm experiments in the laboratory are conducted to isolate the effect of factor combinations (temperature, leachate, oxygen) found in the field on enzymatic activities and microbial decay rates. Feeding experiments with Gammarus pulex shall test the effect of secondary leaf compounds, critical oxygen concentration and temperature on shredding. The results will be combined in a descriptive model of leaf decay and the potential shift in the synchronisation of leaf decay processes in fragmented streams.