Characterization and function of particulate organic matter:Evidence from lakes undergoing ecological restoration  

作　　者：Letian Zhang Wenqiang Zhang Hao Guo Baoqing Shan Dongyang Wei 

机构地区：[1]State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environment Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China [3]Technical Centre for Soil,Agriculture and Rural Ecology and Environment,Ministry of Ecology and Environment,No.8,Dayangfang,Beijing 100012,China [4]Environmental Development Center of Ministry of Ecology and Environment,Beijing 100029,China

出　　处：《Journal of Environmental Sciences》2025年第4期91-103,共13页环境科学学报(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFC3204003);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Wenqiang Zhang,No.2018058).

摘　　要：Particulate organic matter(POM)plays a crucial role in the organic composition of lakes;however,its characteristics remain poorly understood.This study aimed to characterize the structure and composition of POM in Lake Baiyangdian usingmany kinds of techniques and investigate the effects of different extracted forms of POM on water quality.The suspended particulatematter in the lake had complex compositions,with its components primarily derived from aquatic plants and their detritus.The organic matter content of the suspended particulatematterwas relatively high(organic carbon content 27.29–145.94 g/kg)for the sum of three extractable states(water-extracted organic matter[WEOM],humic acid,and fulvic acid)and one stable bound state(humin).Spatial distribution analysis revealed that the POM content in the water increased from west to east,which was consistent with the water flow pattern influenced by the Baiyangdian water diversion project.Fluorescence spectroscopy analysis of the WEOM showed three prominent peaks with excitation/emission wavelengths similar to those of dissolved organic matter peaks.These peaks were potentially initial products of POM conversion into dissolved organic matter.Furthermore,the intensity of the WEOM fluorescence peak(total fluorescence peak intensity)was negatively correlated with the inorganic nitrogen concentration in water(p<0.01),while the intensity of the HA fluorescence peak showed a positive correlation with the inorganic nitrogen concentration(p<0.01).This suggested that exogenous organic matter inputs led to the diffusion of alkaline dissolved nitrogen from sediment intowater,while degradation processes of aquatic plant debris contributed to the decrease in inorganic nitrogen concentrations in the water column.These findings enhance our understanding of POM characteristics in shallow lakes and the role of POM in shallow lake ecosystems.

关 键 词：Lake baiyangdian Particulate organic matter Physical structure Spatial distribution Three-dimensional fluorescence SPECTROSCOPY 

分 类 号：X831[环境科学与工程—环境工程]