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首页> 外文期刊>Ecology and Evolution >Composition of riparian litter input regulates organic matter decomposition: Implications for headwater stream functioning in a managed forest landscape
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Composition of riparian litter input regulates organic matter decomposition: Implications for headwater stream functioning in a managed forest landscape

机译：河岸垃圾输入的组成调节有机物的分解：对受管理森林景观中源头水流功能的影响

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Abstract Although the importance of stream condition for leaf litter decomposition has been extensively studied, little is known about how processing rates change in response to altered riparian vegetation community composition. We investigated patterns of plant litter input and decomposition across 20 boreal headwater streams that varied in proportions of riparian deciduous and coniferous trees. We measured a suite of in-stream physical and chemical characteristics, as well as the amount and type of litter inputs from riparian vegetation, and related these to decomposition rates of native (alder, birch, and spruce) and introduced (lodgepole pine) litter species incubated in coarse- and fine-mesh bags. Total litter inputs ranged more than fivefold among sites and increased with the proportion of deciduous vegetation in the riparian zone. In line with differences in initial litter quality, mean decomposition rate was highest for alder, followed by birch, spruce, and lodgepole pine (12, 55, and 68% lower rates, respectively). Further, these rates were greater in coarse-mesh bags that allow colonization by macroinvertebrates. Variance in decomposition rate among sites for different species was best explained by different sets of environmental conditions, but litter-input composition (i.e., quality) was overall highly important. On average, native litter decomposed faster in sites with higher-quality litter input and (with the exception of spruce) higher concentrations of dissolved nutrients and open canopies. By contrast, lodgepole pine decomposed more rapidly in sites receiving lower-quality litter inputs. Birch litter decomposition rate in coarse-mesh bags was best predicted by the same environmental variables as in fine-mesh bags, with additional positive influences of macroinvertebrate species richness. Hence, to facilitate energy turnover in boreal headwaters, forest management with focus on conifer production should aim at increasing the presence of native deciduous trees along streams, as they promote conditions that favor higher decomposition rates of terrestrial plant litter.
机译：摘要尽管已经广泛研究了水流条件对凋落物分解的重要性，但对于处理速率如何响应河岸植被群落组成的变化而知之甚少。我们调查了20根北方河源水流中植物凋落物输入和分解的模式，这些河床河岸落叶和针叶树的比例各不相同。我们测量了一套溪流的物理和化学特性，以及河岸植被输入的凋落物的数量和类型，并将其与天然（al木，桦木和云杉）分解垃圾和引入的（落杆松）垃圾分解速率相关联。种在粗网袋和细网袋中孵育。不同地点的凋落物总输入量变化超过五倍，并且随着河岸带落叶植被的比例增加。与初始垫料质量的差异一致，al木的平均分解率最高，其次是桦木，云杉和黑松（分别降低了12％，55％和68％）。此外，在允许大型无脊椎动物定殖的粗网袋中，这些比率更高。不同物种的环境条件可以最好地解释不同物种的场所之间分解速率的差异，但总体而言，凋落物投入的组成（即质量）非常重要。平均而言，在具有更高质量的垫料输入以及（除了云杉之外）更高浓度的溶解养分和开放冠层的地方，天然垫料分解得更快。相比之下，在接收到质量较低的垫料输入的地方，黑松的分解速度更快。最好通过与细网眼袋相同的环境变量来预测粗网眼袋中桦木凋落物的分解速率，同时还要考虑大型无脊椎动物物种丰富度的其他积极影响。因此，为了促进北部源头地区的能源周转，侧重于针叶树生产的森林管理应旨在增加沿河原生落叶树的存在，因为它们促进了有利于陆地植物凋落物更高分解率的条件。

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