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DOI	10.1016/j.jenvman.2024.120084
	Composition of DOM along the depth gradients in the paddy field treated with crop straw for 10 years
	Huang, Rong; Li, Zheng; Xiao, Yi; Liu, Jiang; Jiang, Tao; Deng, Ouping; Tang, Xiaoyang; Wu, Yingjie; Tao, Qi; Li, Qiquan; Luo, Youlin; Gao, Xuesong; Wang, Changquan; Li, Bing
发表日期	2024
ISSN	0301-4797
EISSN	1095-8630
起始页码	353
卷号	353
英文摘要	Crop straw return is a widely used agricultural management practice. The addition of crop straw significantly alters the pool of dissolved organic matter (DOM) in agricultural soils and plays a pivotal role in the global carbon (C) cycle, which is sensitive to climate change. The DOM concentration and composition at different soil depths could regulate the turnover and further storage of organic C in terrestrial systems. However, it is still unclear how crop straw return influences the change in DOM composition in rice paddy soils. Therefore, a field experiment was conducted in which paddy soil was amended with crop straw for 10 years. Two crop strawaddition treatments [NPK with 50% crop straw (NPK+1/2S) and NPK with 100% crop straw (NPK + S)], a conventional mineral fertilization control (NPK) and a non -fertilized control were included. Topsoil (0-20 cm) and subsoil (20-40 cm) samples were collected to investigate the soil DOM concentration and compositional structure of the profile. Soil nutrients, iron (Fe) fraction, microbial biomass carbon (MBC), and concentration and optical properties (UV-Vis and fluorescence spectra) of soil DOM were determined. Here, we found that the DOM in the topsoil was more humified than that in the subsoil. The addition of crop straw further decreased the humidification degree of DOM in the subsoil. In crop straw -amended topsoil, microbial decomposition controlled the composition of DOM and induced the formation of aromatic DOM. In the straw -treated subsoil, selective adsorption by poorly crystalline Fe(oxyhydr)oxides and microbial decomposition controlled the composition of DOM. In particular, the formation of protein -like compounds could have played a significant role in the microbial degradation of DOM in the subsoil. Overall, this work conducted a case study within long-term agricultural management to understand the changes in DOM composition along the soil profile, which would be further helpful for evaluating C cycling in agricultural ecosystems.
英文关键词	Straw return; Paddy soil; Soil dissolved organic matter; Soil depth; Iron species
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001173050500001
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304028
作者单位	Sichuan Agricultural University; Chinese Academy of Sciences; Institute of Geochemistry, CAS; Southwest University - China; Ministry of Natural Resources of the People's Republic of China
推荐引用方式 GB/T 7714	Huang, Rong,Li, Zheng,Xiao, Yi,et al. Composition of DOM along the depth gradients in the paddy field treated with crop straw for 10 years[J],2024,353.
APA	Huang, Rong.,Li, Zheng.,Xiao, Yi.,Liu, Jiang.,Jiang, Tao.,...&Li, Bing.(2024).Composition of DOM along the depth gradients in the paddy field treated with crop straw for 10 years.JOURNAL OF ENVIRONMENTAL MANAGEMENT,353.
MLA	Huang, Rong,et al."Composition of DOM along the depth gradients in the paddy field treated with crop straw for 10 years".JOURNAL OF ENVIRONMENTAL MANAGEMENT 353(2024).