数字农科院2.0

Nitrogen Addition Drives Convergence Of L.eaf Litter Decomposition Rates B etween Flaveria Bidentis And Native Plant

文献类型： 外文期刊

作者： Huangfu, CH; Wei, ZS

作者机构：

关键词： Decomposition; Nitrogen deposition; Nitrogen release; Invasive plants; Fine root litter

期刊名称： PLANT ECOLOGY

ISSN： 1385-0237

年卷期： 2018 年 219 卷 11 期

页码：

收录情况： JCR（2021版）

摘要： Evidence is growing that invasive species can change decomposition rates and associated nutrient cycling within an ecosystem by changing the quality of the litter entering a system. However, the relative contribution of their distinct litter types to carbon turnover is less understood, especially in the context of enhanced N deposition. The objective of this study was to investigate the whole-plant responses of an invasive plant Flaveria bidentis in litter decay to simulated N eutrophication. A 1-year study was conducted to assess if N enhancement influenced decomposition and nutrient dynamics of litters from foliage, fine roots and twigs of F. bidentis compared to co-occurring native species Setaria viridis. N fertilization significantly decreased the decomposition rate of the foliage of the invasive F. bidentis by more than 25% relative to the water control, but had relatively minor effects on decomposition of its twigs and fine root litter or leaf litter from the native species. Collectively, decomposition rates of foliar litters of the invasive and native species become convergent over time in the presence of N addition. Moreover, net N loss was predominately influenced by litter species, followed by the litter type, while N addition had little effect on net N loss. Our study showed that the variation in litter decomposition was much greater between litter types of the invasive F. bidentis than between different plant species under the N addition and that the litter of invasive species with higher inherent decomposability did not always decompose more rapidly than the litter of native species in response to predicted N deposition enhancement.

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