干旱区生态环境知识资源中心(Arid): Accumulation of nitrate and dissolved organic nitrogen at depth in a red soil Critical Zone

Arid

DOI	10.1016/j.geoderma.2018.11.019
	Accumulation of nitrate and dissolved organic nitrogen at depth in a red soil Critical Zone
	Wu, Huayong 1; Song, Xiaodong 1; Zhao, Xiaorui 1,2; Peng, Xinhua 1; Zhou, Hu 1; Hallett, Paul D.3; Hodson, Mark E.4; Zhang, Gan-Lin 1,2
通讯作者	Zhang, Gan-Lin
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2019
卷号	337 页码:1175-1185
英文摘要	Nitrate accumulation has been reported in the top 1 m and subsurface soil (> 1 m) across arid to semi-humid regions, but not in humid regions. Nitrate inventories through the whole regolith, referred to collectively as soil and saprolite, in humid regions have received little attention to date, likely due to previously assumed low nitrification rates and large nitrogen (N) losses by severe surface runoff and erosion. In order to understand if and how reactive N exists in the below ground (soil and saprolite) in humid environment, the amount of NO3--N, NH4+-N and dissolved organic N (DON) present in the regolith to a depth of 9 m in a typical red soil Critical Zone was investigated under different land uses (upland, woodland and paddy field). The Red Soil Critical Zone Observatory is located in the subtropical Jiangxi Province, China, with a mean annual precipitation of 1795 mm and mean annual potential evapotranspiration of 1229 mm. The examined regoliths were acidic, highly weathered, and mainly clay loam to clay in texture. Results showed that on average 92% (827 +/- 97 kg N ha(-1)) of NO3--N and 82% (521 +/- 153 kg N ha(-1)) of DON were stored at depth (from a depth of 1 m to the bedrock surface) in the upland regolith, while 92% (283 kg N ha(-1)) of NO3--N and 78% (820 kg N ha(-1)) of DON were stored at depth in the woodland regolith. Nitrate N significantly accumulated with depth in the upland regolith from the 1- to 4-m depth interval (p < 0.01), while the inventory (632 +/- 75 kg N ha(-1)) in the top 3-m zone accounted for on average 71% of the total. Dissolved organic N significantly accumulated with depth in the upland regolith from the 0- to 3-m depth interval (p < 0.01), while the inventory (408 +/- 75 kg N ha(-1)) in the top 3-m zone accounted for on average 64% of the total. There was no significant accumulation for NH4+-N throughout the upland regolith (p = 0.35). No substantial accumulation of dissolved N was measured at depth in paddy field regoliths with different cultivation ages. The finding that large reservoirs of reactive N can exist in deep regolith rather than in the routinely investigated solum of subtropical regions shows a missing part of the terrestrial N budget and raises concerns about potential groundwater nitrate pollution.
英文关键词	Nitrate accumulation Dissolved organic nitrogen Porosity Red soil Critical Zone Observatory
类型	Article
语种	英语
国家	Peoples R China ; Scotland ; England
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000456761500116
WOS关键词	DRINKING-WATER NITRATE ; REACTIVE NITROGEN ; CENTRAL-VALLEY ; CHINA ; GROUNDWATER ; NITRIFICATION ; RISK ; CONTAMINATION ; DEPOSITION ; TRENDS
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215913
作者单位	1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Jiangsu, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 3.Univ Aberdeen, Sch Biol Sci, Aberdeen AB24 3UU, Scotland; 4.Univ York, Environm Dept, York YO10 5NG, N Yorkshire, England
推荐引用方式 GB/T 7714	Wu, Huayong,Song, Xiaodong,Zhao, Xiaorui,et al. Accumulation of nitrate and dissolved organic nitrogen at depth in a red soil Critical Zone[J],2019,337:1175-1185.
APA	Wu, Huayong.,Song, Xiaodong.,Zhao, Xiaorui.,Peng, Xinhua.,Zhou, Hu.,...&Zhang, Gan-Lin.(2019).Accumulation of nitrate and dissolved organic nitrogen at depth in a red soil Critical Zone.GEODERMA,337,1175-1185.
MLA	Wu, Huayong,et al."Accumulation of nitrate and dissolved organic nitrogen at depth in a red soil Critical Zone".GEODERMA 337(2019):1175-1185.