Vegetation patches increase wind-blown litter accumulation in a semi-arid steppe of northern China

文献类型： 外文期刊

第一作者： Yan, Yuchun

作者： Yan, Yuchun;Xin, Xiaoping;Wang, Xu;Yan, Ruirui;Xu, Xingliang;Murray, Philip J.

作者机构：

关键词： litter accumulation;nutrient redistribution;vegetation cover

期刊名称：ENVIRONMENTAL RESEARCH LETTERS （ 影响因子：6.793； 五年影响因子：7.801 ）

ISSN： 1748-9326

年卷期： 2016 年 11 卷 12 期

页码：

收录情况： SCI

摘要： Litter decomposition is an important source of soil organic matter and nutrients; however, few studies have explored how vegetation patches affect wind-driven litter mobility and accumulation. In this study, we aimed to test the following hypotheses: (1) vegetation patches can reduce litter removal and facilitate litter accumulation, (2) litter mobility results in the heterogeneous redistribution of carbon and nutrients over the land surface, and (3) litter removal rates differ among different litter types (e.g., leaf and stem). Four vegetation patch types and six litter types were used to investigate the impacts of vegetation patches on litter mobility and accumulation. The results show that compared with almost bare ground patches, patches with vegetation cover had significantly higher litter accumulation, with the shrub patch type having the highest accumulation amount. The rate of litter removal due to wind was highest for the almost bare surface type (P4) and lowest for the shrub patch (P1) and Stipa grandis community (P2) types. There were significant differences in the removal rate among the different litter types. These findings indicate that wind-based litter redistribution among bare, S. grandis-dominated, and shrub-dominated patches is at least partially responsible for increasing the spatial heterogeneity of resources on a landscape scale.

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