生态学报2025，Vol.45Issue(6)：2905-2917,13.DOI:10.20103/j.stxb.202404170850
三峡库区城镇河流凋落物分解对城镇化率的响应
Response of leaf-litter decomposition in urban streams of the Three Gorges Reservoir area to different urbanization rates
摘要
Abstract
The leaf-litter decomposition is crucial for nutrient cycling in aquatic ecosystem,but the impact of urbanization on leaf-litter decomposition in urban streams remains to be clarified.To explore the transformation of relative contribution among leaf-litter decomposer groups and decomposition of streams with different urbanization rates,we took 3 Three Gorges Reservoir Regional urban streams with different urbanization rates as the research site,2 representative leaf-litter in riparian zones with different initial physiochemical properties were selected,and decomposition bags with 2 different mesh sizes(0.05mm and 1mm)were set in situ to carry out the experiment.The results showed that:(1)The decomposition rate of leaf-litter decreased by approx 30%in the high urbanization rate stream(the average decomposition rate of Broussonetia papyrifera and Ficus microcarpa decreased by 1/4 and 1/3),the decline of recalcitrant leaf-litter was more significant.(2)Microbial decomposers contributed over 80%to the leaf-litter breakdown across all the three streams.In the stream with high urbanization rate,the relative contribution of bacteria decomposition is greater than that of fungi;The proportion of pollution tolerant species in benthic invertebrates increased to 90%,and the shredder who played a vital role in decomposition disappeared,and the relative contribution to less recalcitrant leaf-litter and recalcitrant leaf-litter decreased by 45%and 15%.The decomposition rate did not change significantly in streams with low and medium urbanization rate,but was significantly reduced in stream with high urbanization rate.This study provided a scientific basis for elucidating the degradation mechanism behind stream leaf-litter decomposition in subtropical towns.关键词
凋落物分解/城镇化/河流/底栖动物/微生物/三峡库区Key words
litter decomposition/urbanization/streams/benthic invertebrates/microbe/the Three Gorges Reservoir引用本文复制引用
王程成,谭秋君,韦冰,姚婧梅,林敦梅,何强,钱深华,智悦,韩乐,邓连森..三峡库区城镇河流凋落物分解对城镇化率的响应[J].生态学报,2025,45(6):2905-2917,13.基金项目
国家自然科学基金(U20A20326) （U20A20326）
中央高校项目(2019CDXYCH0026) （2019CDXYCH0026）
重庆市留学人员创新支持计划(cx2021107) （cx2021107）
