Sheep grazing and local community diversity interact to control litter decomposition of dominant species in grassland ecosystem

Sheep grazing and local community diversity interact to control litter decomposition of dominant species in grassland ecosystem
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羊放牧和当地群落多样性相互作用,控制草原生态系统中优势物种的凋落物分解

DOI:
10.1016/j.soilbio.2017.09.003
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发表时间:
2017-12
影响因子:
9.7
通讯作者:
Wang Deli
Wang Deli
中科院分区:
农林科学1区
文献类型:
--
作者:
Song Xuxin;Wang Ling;Zhao Xuan;Liu Chen;Chang Qing;Wang Ying;Xu Tongtong;Wang Deli

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大型草食动物放牧是草地的一种主要土地利用方式,可以与当地植物多样性形成反馈回路,影响凋落物分解。本文研究了绵羊放牧和当地植物群落多样性对中国草甸草原优势植物羊草凋落物分解的交互作用。我们发现一个更快的凋落物分解率在当地物种丰富的社区相比,当地物种贫乏的社区在没有羊放牧。然而,在绵羊放牧的存在下,分解率显着降低,在当地物种丰富的社区,而增加在当地物种贫乏的社区。因此,绵羊放牧和当地群落多样性构成了一个负反馈回路,以修改该草原生态系统中的凋落物分解。研究结果表明,草食动物放牧的结果之一可能是通过平衡当地群落间凋落物分解速率,使草地养分循环在空间上趋于均匀,从而提高了定界性结构的均匀性。此外,当地社区多样性的减少可能会减缓生态系统进程的速度。我们的研究表明,绵羊放牧,或等效的,抵消这种负面影响,当地植物多样性的损失对凋落物分解。
Large herbivore grazing, a major land use in grasslands, can constitute a feedback loop with local plant diversity to affect litter decomposition. Here we examined the interactive effects of sheep grazing and local plant community diversity on decomposition of litter of the dominant plant species (Leymus chinensis) in the meadow steppe of China. We found a faster litter decomposition rate in the local species-rich communities compared to the local species-poor communities in the absence of sheep grazing. However, in the presence of sheep grazing, the decomposition rate was significantly reduced in the local species-rich communities while increased in the local species-poor communities. Therefore, sheep grazing and local community diversity constituted a negative feedback loop to modify litter decomposition in this grassland ecosystem. The findings of this study indicate one outcome of herbivore grazing could be to homogenize grassland nutrient cycling in space by balancing litter decomposition rate among local communities, which therefore could increase the homogenization of metacommunity structure. Furthermore, reduced local community diversity may slow ecosystem process rates. Our study indicates that sheep grazing, or equivalent, offsets this negative effect of local plant diversity loss on litter decomposition.
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