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Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone

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Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone. / Wu, Huayong; Song, Xiaodong; Zhao, Xiaorui; Peng, Xinhua; Zhou, Hu; Hallett, Paul; Hodson, Mark Edward; Zhang, Gan-Lin.

In: Geoderma, Vol. 337, 23.11.2018, p. 1175-1185.

Research output: Contribution to journalArticlepeer-review

Harvard

Wu, H, Song, X, Zhao, X, Peng, X, Zhou, H, Hallett, P, Hodson, ME & Zhang, G-L 2018, 'Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone', Geoderma, vol. 337, pp. 1175-1185. https://doi.org/10.1016/j.geoderma.2018.11.019

APA

Wu, H., Song, X., Zhao, X., Peng, X., Zhou, H., Hallett, P., Hodson, M. E., & Zhang, G-L. (2018). Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone. Geoderma, 337, 1175-1185. https://doi.org/10.1016/j.geoderma.2018.11.019

Vancouver

Wu H, Song X, Zhao X, Peng X, Zhou H, Hallett P et al. Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone. Geoderma. 2018 Nov 23;337:1175-1185. https://doi.org/10.1016/j.geoderma.2018.11.019

Author

Wu, Huayong ; Song, Xiaodong ; Zhao, Xiaorui ; Peng, Xinhua ; Zhou, Hu ; Hallett, Paul ; Hodson, Mark Edward ; Zhang, Gan-Lin. / Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone. In: Geoderma. 2018 ; Vol. 337. pp. 1175-1185.

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@article{6bfeb1ba7c374dcc8051bc98bcdc24ff,
title = "Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone",
abstract = "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 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 34 groundwater nitrate pollution.",
keywords = "nitrate accumulation, dissolved organic nitrogen, porosity, red soil, critical zone observatory",
author = "Huayong Wu and Xiaodong Song and Xiaorui Zhao and Xinhua Peng and Hu Zhou and Paul Hallett and Hodson, {Mark Edward} and Gan-Lin Zhang",
note = "{\textcopyright} 2018 Elsevier B.V. This is an author-produced version of the published paper. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. Further copying may not be permitted; contact the publisher for details. ",
year = "2018",
month = nov,
day = "23",
doi = "10.1016/j.geoderma.2018.11.019",
language = "English",
volume = "337",
pages = "1175--1185",
journal = "Geoderma",
issn = "0016-7061",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Accumulation of Nitrate and Dissolved Organic Nitrogen at Depth in a Red Soil Critical Zone

AU - Wu, Huayong

AU - Song, Xiaodong

AU - Zhao, Xiaorui

AU - Peng, Xinhua

AU - Zhou, Hu

AU - Hallett, Paul

AU - Hodson, Mark Edward

AU - Zhang, Gan-Lin

N1 - © 2018 Elsevier B.V. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

PY - 2018/11/23

Y1 - 2018/11/23

N2 - 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 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 34 groundwater nitrate pollution.

AB - 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 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 34 groundwater nitrate pollution.

KW - nitrate accumulation

KW - dissolved organic nitrogen

KW - porosity

KW - red soil

KW - critical zone observatory

U2 - 10.1016/j.geoderma.2018.11.019

DO - 10.1016/j.geoderma.2018.11.019

M3 - Article

VL - 337

SP - 1175

EP - 1185

JO - Geoderma

JF - Geoderma

SN - 0016-7061

ER -