Litter mixed decomposition effect of urban eutrophic streams in the Three Gorges Reservoir area
DOU Peng-peng1,2, LIN Dun-mei1, WANG Fang1, HUANG Yu-yue1, GAO Jie1, YANG Wei1, WEI Bing1, LI Wei1, YAO Jing-mei1
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400044, China; 2. College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China
Abstract：The Qingshuixi stream located in Chongqing City of the Three Gorges Reservoir Region was investigated as a typical representative of the urban eutrophication stream. Three common litters in the riparian zone were selected as decomposition objects. The in situ experiment included seven combinations of litters (i.e., three single treatments and four equal-mass mixed treatments) and three mesh size litter bags (i.e., 50mm, 250mm, and 2mm). The mixed litter traits, functional diversity, decomposer groups, and their interaction on mass loss and mixing effects were explored. Among the above-mentioned mixed treatments, only 50% of the treatments showed significant non-additive effects (and all were negative), which was closely related to the characteristics of litter. As the functional dispersion of mixed litters increased, the decomposition slowed down, especially when litters containing high lignin and other difficult-to-decompose materials are combined. Microbes played a dominant role in the decomposition of mixed litter in the eutrophic streams. In addition, both meiofauna and macrofauna inhibited the decomposition process of mixed litter. These results indicate that in the process of restoration of eutrophic rivers, attention should be paid to the decomposition function of riparian litter. The arrangement of riparian plants should be adjusted and the biodiversity of benthic animals should be improved and then restore the positive effects of benthic animals in litter decomposition.
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