Simultaneous Measurements of Dissolved Organic Carbon and Soil Respiration Reveal Reduced Soil Carbon Loss Under Nitrogen Addition in a Montane Forest
Wang, Tao LU ; Ao, Jing ; Liu, Xinyu ; Peng, Yuanrui ; Op de Beeck, Michiel LU
and Chang, Ruiying
(2022)
In Journal of Geophysical Research: Biogeosciences
127(7).
- Abstract
A major uncertainty in the estimation of soils acting as net carbon (C) sinks or sources stem from the effects of anthropogenic nitrogen (N) input on the balance between plant C input and soil C loss. In contrast to the generally observed increasing pattern of plant C input, the response of soil C loss to increased N deposition remains elusive, largely due to its large temporal variation. Here simultaneous measurements of two major soil C loss pathways, including dissolved organic carbon (DOC) leaching and soil respiration, were conducted for 5 and 3 yr, respectively, to assess the effects of N addition on soil C loss in an N-limited montane forest. The effects were seasonal, depth and N level dependent and the two pathways responded... (More)
A major uncertainty in the estimation of soils acting as net carbon (C) sinks or sources stem from the effects of anthropogenic nitrogen (N) input on the balance between plant C input and soil C loss. In contrast to the generally observed increasing pattern of plant C input, the response of soil C loss to increased N deposition remains elusive, largely due to its large temporal variation. Here simultaneous measurements of two major soil C loss pathways, including dissolved organic carbon (DOC) leaching and soil respiration, were conducted for 5 and 3 yr, respectively, to assess the effects of N addition on soil C loss in an N-limited montane forest. The effects were seasonal, depth and N level dependent and the two pathways responded asynchronously to N addition. Significant decreases in DOC concentrations and fluxes in leachates from the organic layer were observed during autumn/winter under a high N addition rate (40 kg N/ha/yr). No significant impact of N addition on DOC concentrations or fluxes was observed for leachates from the mineral soil horizon. Biodegradability was low for DOC from both soil layers and was not consistently influenced by N addition. Soil respiration was significantly decreased under high N addition. Annual soil C loss (estimated by summing DOC leaching from the mineral horizon and soil respiration) showed that N addition reduced soil C loss consistently over years, implying that the forest soil is likely a C sink under excess N deposition, which should be confirmed with longer term monitoring.
(Less)
- author
- Wang, Tao
LU
; Ao, Jing
; Liu, Xinyu
; Peng, Yuanrui
; Op de Beeck, Michiel
LU
and Chang, Ruiying
- organization
- publishing date
- 2022
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- aromaticity of DOC, biodegradability, CO, dissolved organic carbon leaching, nitrogen deposition, soil carbon
- in
- Journal of Geophysical Research: Biogeosciences
- volume
- 127
- issue
- 7
- article number
- e2022JG006829
- publisher
- Wiley
- external identifiers
-
- scopus:85135004324
- ISSN
- 2169-8953
- DOI
- 10.1029/2022JG006829
- language
- English
- LU publication?
- yes
- id
- ba8eca8f-d1d7-4369-9b34-6b3ca4a885ce
- date added to LUP
- 2022-09-23 15:00:53
- date last changed
- 2022-09-23 15:00:53
@article{ba8eca8f-d1d7-4369-9b34-6b3ca4a885ce,
abstract = {{<p>A major uncertainty in the estimation of soils acting as net carbon (C) sinks or sources stem from the effects of anthropogenic nitrogen (N) input on the balance between plant C input and soil C loss. In contrast to the generally observed increasing pattern of plant C input, the response of soil C loss to increased N deposition remains elusive, largely due to its large temporal variation. Here simultaneous measurements of two major soil C loss pathways, including dissolved organic carbon (DOC) leaching and soil respiration, were conducted for 5 and 3 yr, respectively, to assess the effects of N addition on soil C loss in an N-limited montane forest. The effects were seasonal, depth and N level dependent and the two pathways responded asynchronously to N addition. Significant decreases in DOC concentrations and fluxes in leachates from the organic layer were observed during autumn/winter under a high N addition rate (40 kg N/ha/yr). No significant impact of N addition on DOC concentrations or fluxes was observed for leachates from the mineral soil horizon. Biodegradability was low for DOC from both soil layers and was not consistently influenced by N addition. Soil respiration was significantly decreased under high N addition. Annual soil C loss (estimated by summing DOC leaching from the mineral horizon and soil respiration) showed that N addition reduced soil C loss consistently over years, implying that the forest soil is likely a C sink under excess N deposition, which should be confirmed with longer term monitoring.</p>}},
author = {{Wang, Tao and Ao, Jing and Liu, Xinyu and Peng, Yuanrui and Op de Beeck, Michiel and Chang, Ruiying}},
issn = {{2169-8953}},
keywords = {{aromaticity of DOC; biodegradability; CO; dissolved organic carbon leaching; nitrogen deposition; soil carbon}},
language = {{eng}},
number = {{7}},
publisher = {{Wiley}},
series = {{Journal of Geophysical Research: Biogeosciences}},
title = {{Simultaneous Measurements of Dissolved Organic Carbon and Soil Respiration Reveal Reduced Soil Carbon Loss Under Nitrogen Addition in a Montane Forest}},
url = {{http://dx.doi.org/10.1029/2022JG006829}},
doi = {{10.1029/2022JG006829}},
volume = {{127}},
year = {{2022}},
}