Effects of nutrient addition on the composition and chemical characteristics of soil dissolved organic matter in a desert steppe in northern China

Bibliographic Data

ID21648060
AuthorsBingqing Liu (0000-0003-1571-6119, Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China Ningxia University Yinchuan China), Rongjie Wu (Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China Ningxia University Yinchuan China), Bin Xue (0000-0002-3175-5604, Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China Ningxia University Yinchuan China, corresponding author), Ruili Gao (0000-0001-5323-7659, School of Agriculture Ningxia University Yinchuan China, corresponding author), Hui An (0000-0002-5881-4213, Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China Ningxia University Yinchuan China), Lichao Liu (0000-0002-1389-8281, Shapotou Desert Research & Experiment Station, Northwest Institute of Eco‐environment and Resources Chinese Academy of Sciences Lanzhou China), George Martial Ndzana (0000-0001-8279-0736, Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon), Lingtong Du (0000-0003-3791-9769, Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwestern China Ningxia University Yinchuan China), Muhammad Kamran (0000-0001-5083-9806, School of Agriculture, Food and Wine The University of Adelaide Adelaide South Australia Australia)
Year2024
Volume35
Issue4
Pages1365-1380
Publication date2024-02-28
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueLand Degradation and Development (JOURNAL)
Journal identifiersISSN: 1085-3278 • E-ISSN: 1099-145X
PublisherWiley (PUBLISHER • GB)
DOI10.1002/ldr.4992
OpenAlexW4389068737
LanguageEN
Citations received1
References cited94

Dissolved organic matter (DOM) plays a critical role in ecosystem function and productivity, particularly in carbon (C) cycling in grassland ecosystems. However, changes in the structural complexity of DOM in a desert steppe following long‐term treatment with nitrogen (N) and phosphorus (P) remain unclear; this limits our understanding of the nutrient‐related soil C cycle in a desert steppe. In the present study, soil experiments were conducted in the 0–10 cm soil layer of a desert steppe in northern China from 2017 to 2021, and four treatments were established: P, N, N + P (NP), and no nutrient addition (CK). The content and chemical composition of soil DOM were determined by ultraviolet–visible absorbance, fluorescence, and Fourier transform infrared spectroscopy. Compared to CK treatment, nutrient addition increased soil DOM content by 2.86%–53.84%. NP addition increased the average molecular weight, aromaticity, and humification degree of soil DOM. The DOM source was attributed to the combination of foreign and local sources. Fluorescent components of the DOM samples were mainly proteins and humic acids; the humic acid content decreased after N addition and increased after P and NP addition. Nutrient availability and pH were the key factors affecting the changes in the source and average molecular weight of the DOM, respectively. The soil organic matter content was significantly positively correlated with the humification index ( r = 0.96). These results imply that nutrient addition accelerates the accumulation of DOM and influences its structural complexity; this potentially benefits soil C sequestration in a desert steppe

Agronomy · Biology · Dissolved organic carbon · Ecosystem · Humic acid · Humus · Nutrient · Organic matter · Soil carbon · Soil organic matter · Soil water · Steppe · Chemistry · Environmental Science · Peatlands and Wetlands Ecology · Soil and Water Nutrient Dynamics · Soil Carbon and Nitrogen Dynamics · Ecology · Environmental Chemistry · Soil Science

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