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首页> 外文期刊>Plant and Soil >Litter decomposition of a pine plantation is affected by species evenness and soil nitrogen availability
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Litter decomposition of a pine plantation is affected by species evenness and soil nitrogen availability

机译：松林的凋落物分解受物种均匀度和土壤氮素利用率的影响

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摘要

Litter decomposition is a key process controlling flows of energy and nutrients in ecosystems. Altered biodiversity and nutrient availability may affect litter decomposition. However, little is known about the response of litter decomposition to co-occurring changes in species evenness and soil nutrient availability. We used a microcosm experiment to evaluate the simultaneous effects of species evenness (two levels), identity of the dominant species (three species) and soil N availability (control and N addition) on litter decomposition in a Mongolian pine (Pinus sylvestris var. mongolica) plantation in Northeast China. Mongolian pine needles and senesced aboveground materials of two dominant understory species (Setaria viridis and Artemisia scoparia) were used for incubation. Litter evenness, dominant species identity and N addition significantly affected species interaction and litter decomposition. Higher level of species evenness increased the decomposition rate of litter mixtures and decreased the incidence of antagonistic effects. A. scoparia-dominated litter mixtures decomposed faster than P. sylvestris var. mongolica- and S. viridis-dominated litter mixtures. Notably, N addition increased decomposition rate of both single-species litters and litter mixtures, and meanwhile altered the incidence and direction of non-additive effects during decomposition of litter mixtures. The presence of understory species litters stimulated the decomposition rate of pine litters irrespective of N addition, whereas the presence of pine litters suppressed the mass loss of A. scoparia litters. Moreover, N addition weakened the promoting effects of understory species litters on decomposition of pine litters. Pine litter retarded the decomposition of understory species litters whereas its own decomposition was accelerated in mixtures. Nitrogen addition and understory species evenness altered species interaction through species-specific responses in litter mixtures and thus affected litter decomposition in Mongolian pine forests, which could produce a potential influence on ecosystem C budget and nutrient cycling.
机译：凋落物分解是控制生态系统中能量和养分流的关键过程。生物多样性和养分利用率的变化可能会影响垃圾的分解。但是，关于凋落物分解对物种均匀度和土壤养分利用率同时发生变化的响应知之甚少。我们使用微观实验评估了物种均匀度（两个级别），优势物种的身份（三个物种）和土壤氮素有效性（控制和氮素添加）对蒙古松（Pinus sylvestris var.mongolica）凋落物分解的同时影响。 ）在中国东北的人工林。使用蒙古松针和两种主要的林下种（Setaria viridis和Artemisia scoparia）的地上物质进行孵化。凋落物的均匀度，优势种身份和氮的添加显着影响种间的相互作用和凋落物的分解。较高的物种均匀度可提高垃圾混合物的分解速率，并降低拮抗作用的发生率。 A. scoparia为主的凋落物混合物的分解速度快于P. sylvestris var。蒙古沙律和沙门氏菌为主的垃圾混合物。值得注意的是，氮的添加增加了单一种类凋落物和凋落物混合物的分解速率，同时改变了凋落物混合物分解过程中非累加作用的发生率和方向。不论是否添加氮，林下凋落物凋落物的存在都会刺激松树凋落物的分解速度，而松树凋落物的存在抑制了红景天凋落物的质量损失。此外，氮的添加减弱了林下垫料对松木垫料分解的促进作用。松木凋落物阻碍了林下凋落物凋落物的分解，而其自身的分解作用在混合物中加速了。氮的添加和林下物种的均匀性通过凋落物混合物中的物种特异性反应改变了物种之间的相互作用，从而影响了蒙古松林中凋落物的分解，这可能会对生态系统碳预算和养分循环产生潜在影响。

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