Evidence of nitrogen inputs affecting soil nitrogen purification by mediating root exudates of salt marsh plants

doi:10.1016/j.scitotenv.2024.174396

	Evidence of nitrogen inputs affecting soil nitrogen purification by mediating root exudates of salt marsh plants
	Zhao, Chunyu 1; Liu, Songlin 2; Zhang, Xiaoli3 ; Meng, E.1; Tang, Yan 1; Fen, Zhang 1; Liu, Yang 1; Macreadie, Peter I.4,5
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
	2024-10-10
卷号	946 页码:10
关键词	Exogenous nitrogen addition Root exudate Enzyme activity Functional genes Nitrogen removal capacity Salt marsh wetland
DOI	10.1016/j.scitotenv.2024.174396
通讯作者	Liu, Songlin([email protected])
英文摘要	Salt marsh has an important 'purification' role in coastal ecosystems by removing excess nitrogen that could otherwise harm aquatic life and reduce water quality. Recent studies suggest that salt marsh root exudates might be the 'control centre' for nitrogen transformation, but empirical evidence is lacking. Here we sought to estimate the direction and magnitude of nitrogen purification by salt marsh root exudates and gain a mechanistic understanding of the biogeochemical transformation pathway(s). To achieve this, we used a laboratory incubation to quantify both the root exudates and soil nitrogen purification rates, in addition to the enzyme activities and functional genes under Phragmites australis populations with different nitrogen forms addition (NO3-, NH4+ and urea). We found that NO3- and urea addition significantly stimulate P. australis root exudation of total acids, amino acids, total sugars and total organic carbon, while NH4+ addition only significantly increased total acids, amino acids and total phenol exudation. High total sugars, amino acids and total organic carbon concentrations enlarged nitrogen purification potential by stimulating the nitrogen purifying bacterial activities (including enzyme activities and related genes expression). Potential denitrification rates were not significantly elevated under NH4+ addition in comparison to NO3- and urea addition, which should be ascribed to total phenol self-toxicity and selective inhibition. Further, urea addition stimulated urease and protease activities with providing more NH4+ and NO2- substrates for elevated anaerobic ammonium oxidation rates among the nitrogen addition treatments. Overall, this study revealed that exogenous nitrogen could increase the nitrogen purification-associated bacterial activity through accelerating the root exudate release, which could stimulate the activity of nitrogen transformation, and then improve the nitrogen removal capacity in salt marsh.
资助机构	Shandong Provincial Natural Science Foundation ; Youth Innovation Promotion Association CAS ; Hainan Province Science and Technology Special Fund ; National Natural Science Foundation of China ; Australian Research Council ; Australian Research Council
收录类别	SCI
语种	英语
关键词[WOS]	WETLAND PLANTS ; TRANSFORMATION ; RHIZOSPHERE ; REMOVAL ; DENITRIFICATION ; RELEASE ; NITRATE ; ACID ; FLOW ; MECHANISMS
研究领域[WOS]	Environmental Sciences & Ecology
WOS记录号	WOS:001264891800001
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/35853
专题	海岸带生物学与生物资源利用重点实验室海岸带生物学与生物资源利用重点实验室_海岸带生物资源高效利用研究与发展中心
通讯作者	Liu, Songlin
作者单位	1.Dezhou Univ, Coll Ecol Resources & Environm, Dezhou 253023, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Peoples R China 3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China 4.Deakin Univ, Deakin Marine Res & Innovat Ctr, Sch Life & Environm Sci, Burwood Campus, Burwood, Vic 3125, Australia 5.RMIT Univ, Sch Sci, Biosci & Food Technol Discipline, Melbourne, Vic 3000, Australia
推荐引用方式 GB/T 7714	Zhao, Chunyu,Liu, Songlin,Zhang, Xiaoli,et al. Evidence of nitrogen inputs affecting soil nitrogen purification by mediating root exudates of salt marsh plants[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,946:10.
APA	Zhao, Chunyu.,Liu, Songlin.,Zhang, Xiaoli.,Meng, E..,Tang, Yan.,...&Macreadie, Peter I..(2024).Evidence of nitrogen inputs affecting soil nitrogen purification by mediating root exudates of salt marsh plants.SCIENCE OF THE TOTAL ENVIRONMENT,946,10.
MLA	Zhao, Chunyu,et al."Evidence of nitrogen inputs affecting soil nitrogen purification by mediating root exudates of salt marsh plants".SCIENCE OF THE TOTAL ENVIRONMENT 946(2024):10.