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How macro- and mesofauna contribute to decomposition of single- and mixed-species litter assemblages in a shrub-encroached wetland?

文献类型： 外文期刊

作者： Dong, Kai 1 ; Li, Xue 1 ; Zhang, Qing 1 ; Wang, Jidong 2 ; Zhang, Xinhou 1 ;

作者机构： 1.Nanjing Normal Univ, Sch Environm, Jiangsu Key Lab Environm Change & Ecol Construct, 1 Wenyuan Rd, Nanjing 210023, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Natl Agr Expt Stn Agr Environm, Luhe, Nanjing 210014, Peoples R China

关键词： Litter decomposition; Non-additive effect; Shrub encroachment; Soil fauna; Wetland

期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Background Soil macro- and mesofauna play a critical role in regulating (mixed-)litter decomposition. In shrub-encroached temperate graminoid wetlands, shrub and graminoid litters, with contrasting chemical quality, often interact to affect decomposition. However, little is known about how fauna contribute to decomposition and mixing effects in situ. Methods We collected litters of two graminoid species (Deyeuxia angustifolia and Carex schmidtii) and two shrubs (Betula fruticosa and Salix floderusii) in a shrub-encroached wetland. By a one-year field microcosm experiment involving 8 mm- and 0.5 mm-mesh sizes to control soil fauna sizes in B. fruticosa and S. floderusii islands, we measured litter mass loss of graminoid species, shrubs, and their mixtures. Results In both islands, the 8-mm treatment increased mass loss by 11.4% similar to 35.9% relative to the 0.5-mm, irrespective of monospecific and mixed-species litter. For mixed-species litter, positive non-additive effects on mass loss were common, especially in the 8-mm treatment (in three of four mixtures in the S. floderusii island, and in all mixtures in the B. fruticose island). Specifically, graminoid litters generally had greater mass loss in the shrub-graminoid mixtures than that decomposing alone, with a higher incidence in the 8-mm treatment. For the mixtures, the mesh size explained most variation (26.9%, followed by species composition and litter chemical dissimilarity) in mass loss. Conclusions This study provides field evidences for the critical role of macro- and mesofauna in regulating litter decomposition in freshwater wetlands. Following shrub encroachment, the fauna contributes greatly to positive mixing effects on decomposition of shrub-graminoid litter assemblages.

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