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Organic-Inorganic Fertilization Shifts Dissolved Organic Matter Chemodiversity in Runoff From Tropical Cropland: Roles of Soil Nutrient Stoichiometry

文献类型： 外文期刊

作者： Wu, Dongming 1 ; Wu, Xiaoyan 4 ; Zhang, Wen 1 ; Zhao, Xiongwei 1 ; Leng, Youfeng 1 ; Fang, Changhua 1 ; Li, Qinfen 1 ; Cai, Huifeng 2 ; Chen, Miao 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Haikou, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Low Carbon Green Agr Trop Reg China, Hainan Key Lab Trop Ecocirculing Agr, Haikou, Peoples R China

3.Hainan Danzhou Trop Agroecosyst Natl Observat & Re, Danzhou, Peoples R China

4.Sanya Acad Trop Agr Sci, Sanya, Peoples R China

5.Agr Ecol & Resource Protect Stn Hainan, Haikou, Peoples R China

关键词： chemodiversity; dissolved organic matter; nutrient stoichiometry; organic-inorganic fertilization; runoff

期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：3.7； 五年影响因子：4.4 ）

ISSN： 1085-3278

年卷期： 2024 年 35 卷 17 期

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) is a crucial quality indicator for water health. However, it remains unknown how organic-inorganic fertilization differently shifts the DOM chemodiversity in cropland-impacted runoff, especially the roles of terrestrial nutrient stoichiometry. Here, a field experiment subjected to 7-year history of four fertilization regimes, that is, unfertilized (CK), chemical fertilization (NPK), straw return (SR), and NPK + SR, was conducted to examine the quantity and chemodiversity of runoff DOM in tropical China. Moreover, the ecological relationships between runoff DOM properties and soil C:N:P stoichiometry were evaluated. Relative to the control treatment, the carbon content (DOC) of runoff DOM increased by 29.20% and 48.82% under SR and NPK + SR treatments, but remained unchanged in NPK treatment. Conversely, the DOM nitrogen content (TDN) only elevated in NPK treatment (262.58%). For DOM chemodiversity, SR treatment was rich in methyl carbon and protein-like substances, but lacked fulvic-/humic-like compounds. NPK treatment increased the hydrophilic compounds like amino acids and polysaccharides, while reducing aromaticity. NPK + SR treatment enhanced DOM's aromaticity, molecular weight and humification due to the enrichment of quinone, ketone and fulvic-like substances, possibly shaping an oligotrophic aquatic microbial community. Further study revealed that the occurrence of aromatic DOM was positively correlated with soil moisture content, TK (total potassium), total organic carbon and stoichiometric N:P ratio, indicating the contribution of terrestrial straw-decomposed products. Inversely, the accumulation of hydrophilic substances (e.g., TDN) correlated positively with soil NO3-N and C:P ratio, indicating the contribution of endogenous DOM.

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