基于大型底栖动物功能摄食类群的太湖流域河流生态系统功能特征  

The characteristics of ecosystem functions in the Lake Taihu basin based on the functional feeding groups of benthic macroinvertebrates

作　　者：燕文明[1] 姚琦 蔡永久[2] 黎明杰 高俊峰[2] 李宽意[2,3] 张又 YAN Wenming;YAO Qi;CAI Yongjiu;LI Mingjie;GAO Junfeng;LI Kuanyi;ZHANG You(The National Key Laboratory of Water Disater Prevention,Hohai University,Nanjing 210098,China;State Key Laboratory of Lake and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Sino-Danish College,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]河海大学水灾害防御全国重点实验室,南京210098 [2]中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,南京210008 [3]中国科学院大学中丹学院,北京100049

出　　处：《生态学杂志》2024年第4期982-992,共11页Chinese Journal of Ecology

基　　金：水灾害防御全国重点实验室“一带一路”水与可持续发展科技基金项目(2021491711);江苏水利科技项目(2022032,2022068);中国科学院南京地理与湖泊研究所青年科学家小组项目(2021NIGLAS-CJH01)资助。

摘　　要：为了解功能摄食类群参数表征的生态系统功能特征,基于太湖流域河流73个样点的大型底栖动物和环境因子数据,分析了两大生态区生物多样性指数和功能摄食类群参数及其相关关系。结果表明,西部丘陵区生物多样性指数整体高于东部平原区。功能摄食类群参数与功能多样性指数的相关性更高,物质循环能力与功能均匀度指数和物种多样性指数呈显著负相关,物质纵向输送与功能丰富度指数和Rao二次熵指数呈显著正相关,沿岸物质输入量与物种多样性指数呈显著正相关。冗余分析筛选出对生物多样性指数影响较大的环境因子为溶解氧、总氮、硝态氮、底质指数和浊度,对功能摄食类群参数影响较大的是溶解氧和硝态氮。分段结构方程模型结果表明,营养盐浓度对生态系统功能产生直接负向效应,也可以通过生物多样性指数作用于生态系统功能而产生间接效应,而底质指数对生态系统功能产生直接正向效应,也可以通过生物多样性指数间接正向作用于生态系统功能。We collected data of benthic macroinvertebrates and environmental factors of the Lake Taihu basin from 73 sampling sites,aiming to explore the functional characteristics of river ecosystem based on the parameters of functional feeding groups.The relationships between biodiversity indices and parameters of functional feeding groups in two ecological regions were analyzed.The results showed that biodiversity indices of the western hilly area were generally higher than those of the eastern plain area.The correlations between parameters of functional feeding groups and functional diversity indices were higher than other biodiversity indices.Specially,material circulation was negatively correlated with functional evenness index and species diversity indices,while material longitudinal transport was positively correlated with functional richness index and Rao Q index.There was also a positive correlation between coastal material input and species diversity indices.Results of redundancy analysis indicated that dissolved oxygen,total nitrogen concentration,nitrate nitrogen concentration,substrate index,and turbidity were the environmental factors with significant influences on biodiversity indices,while dissolved oxygen and nitrate nitrogen concentration greatly influenced the parameters of functional feeding groups.According to the piecewise structural equation models,nutrient concentrations had negative effect on ecosystem function directly or indirectly through altering biodiversity indices.Substrate index would have a positive effect on ecosystem function directly,and a positive effect through the biodiversity indices indirectly.

关 键 词：功能多样性 分类学多样性 功能摄食类群 冗余分析 分段结构方程模型 

分 类 号：Q958.8[生物学—动物学]