Spatial heterogeneity and compositional profiles of dissolved organic matter in farmland soils across China' Mainland  

作　　者：Bingjun Han Liyuan Chen Kang Xiao Yang Liu Dong Cao Lu Yu Yujun Li Shu Tao Wenxin Liu 

机构地区：[1]Key Laboratory for Earth Surface Processes,College of Urban and Environmental Sciences,Peking University,Beijing 100871,China [2]Beijing Yanshan Earth Critical Zone National Research Station,College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101408,China [3]Center for Water and Ecology,State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084,China [4]State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Science,Chinese Academy of Sciences,Beijing 100085,China

出　　处：《Journal of Environmental Sciences》2024年第3期593-603,共11页环境科学学报（英文版）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP,No.2019QZKK0304);the Fundamental Research Funds for the Central Universities (No.E2EG0502×2);the Natural Science Foundation Committee of China (No.41991310)。

摘　　要：Dissolved organic matter(DOM) plays an essential role in many geochemical processes,however its complexity, chemical diversity, and molecular composition are poorly understood. Soil samples were collected from 500 vegetable fields in administrative regions of China' Mainland, of which 122 were selected for further investigation. DOM properties were characterized by three-dimensional excitation-emission matrix(3D-EEM) fuorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry(FTICRMS)(field intensity is 15 Tesla). Our results indicated that the main constituents were UVA humic-like substances, humic-like substances, fulvic acid-like substances, and tyrosine-like substances. A total of 10,989 molecular formulae with a mass range of 100.04 to 799.59 Da were detected, covering the mass spectrometric information of the soil samples from 27 different regions. CHO and CHON molecules were dominant in DOM, whereas lignin, tannins,and aromatic substances served as the main components. The results of cluster analysis revealed that the soil properties in Jiangxi Province were considerably different from those in other regions. The key backgrounds of the DOM molecular characteristics in the vegetablefield soil samples across China' Mainland were provided at the molecular level, with large abundance and great variability.

关 键 词：Dissolved organic matter(DOM) Fourier transform ion cyclotron resonance mass(FTICR-MS) Excitation-emission matrix(EEM) Vegetable-field soils China' Mainland 

分 类 号：S153.621[农业科学—土壤学]