Photochemical transformation of terrestrial dissolved organic matter derived from multiple sources in tropical plantations

Yin，Gege1; Zhang，Peng1; Wang，Yinghui1; Aftab，Bilal1; Du，Penghui1; Zhang，Qiang1,2; Chen，Guoping1,3; Wang，Mengke1; Yang，Biwei1,4; Wang，Senhao5,6; Mo，Jiangming5,6; Zhang，Wei5,6; Wang，Junjian1

2023-10-01

10.1016/j.gca.2023.08.016

Geochimica et Cosmochimica Acta   Impact Factor & Quartile

0016-7037

1872-9533

Photochemical transformation is a critical geochemical fate of terrestrial dissolved organic matter (DOM) that drains from forests to downstream water bodies. However, the photo-degradability and photo-transformation of terrestrial DOM from various sources are yet to be explored. Here, optical spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry were used to analyze photochemical change in spectroscopic and molecular-level signatures of DOM derived from throughfall, stemflow, runoff, and soil pore water at depths of 20 and 40 cm in tropical typical Eucalyptus urophylla (EU) and Acacia auriculiformis (AA) plantations. The dissolved organic carbon concentrations were generally higher in the EU plantation than in the AA plantation and higher in stemflow than in other sample types. The greatest DOM degradation occurred in soil pore water and the least degradation occurred in stemflow. Similarly, the common photo-transformation of DOM, including decreased aromaticity and unsaturation degrees, was greatest for soil pore water and the least for stemflow DOM. Most of the photochemical products were high H/C and O/C molecules for throughfall, stemflow, and pore water, but high H/C and low O/C molecules for runoff because of strong decarboxylation. These findings reveal the highly varied molecular composition and photo-degradability of DOM from different terrestrial sources and highlight that stemflow is an important contributor to photo-resistant DOM among terrestrial DOM sources.

Photo-degradation Photochemical transformation Plantations Terrestrial dissolved organic matter (DOM) Ultrahigh-resolution mass spectrometry

SCI

English

NI Journal Papers

First ; Corresponding

Basic and Applied Basic Research Foundation of Guangdong Province[2021B1515020082];

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001070687000001

PERGAMON-ELSEVIER SCIENCE LTD

GEOSCIENCES

2-s2.0-85169011562

Scopus

1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Environment,Harbin Institute of Technology,Harbin,150090,China
3.School of Urban Planning and Design,Peking University,Shenzhen,518055,China
4.State Key Laboratory of Environmental and Biological Analysis,Department of Chemistry,Hong Kong Baptist University,519087,Hong Kong
5.Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou,510650,China
6.Center for Plant Ecology,Core Botanical Gardens,Chinese Academy of Sciences,Guangzhou,510650,China

Yin，Gege,Zhang，Peng,Wang，Yinghui,et al. Photochemical transformation of terrestrial dissolved organic matter derived from multiple sources in tropical plantations[J]. Geochimica et Cosmochimica Acta,2023,358:162-173.

Yin，Gege.,Zhang，Peng.,Wang，Yinghui.,Aftab，Bilal.,Du，Penghui.,...&Wang，Junjian.(2023).Photochemical transformation of terrestrial dissolved organic matter derived from multiple sources in tropical plantations.Geochimica et Cosmochimica Acta,358,162-173.

Yin，Gege,et al."Photochemical transformation of terrestrial dissolved organic matter derived from multiple sources in tropical plantations".Geochimica et Cosmochimica Acta 358(2023):162-173.