Nitrogen deposition and responses of forest structure to nitrogen deposition in a cool-temperate deciduous forest

Ruoming Cao, Siyu Chen, Shimpei Yoshitake, Toshiyuki Ohtsuka

研究成果: Article

抄録

Few studies have reported the estimation of nitrogen (N) deposition, including dissolved organic N (DON) fluxes, through water flows and the contribution of snowfall in Asia. In this study, the concentrations and fluxes of DON and dissolved inorganic N (DIN) in bulk precipitation (BP), the throughfall (TF) of trees and understory dwarf bamboo, and stemflow (SF) were evaluated in a cool-temperate forest over three years to clarify N fluxes via precipitation and responses of trees and understory canopies to N deposition. The input of N to the study site in BP was 11.1 ± 1.71 kg N ha-1 year-1, with a significant contribution from DON (78%). Snowfall fluxes contributed up to 46% of the totalNinput, with variations related to the amount of snowfall (2.08-5.52 kgNha-1 year-1). The forest canopy enriched DON (2.11 ± 0.42 kg N ha-1 year-1) but consumed NO3 + NO2-N (-0.73 ± 0.19 kg N ha-1 year-1). In contrast, through the understory bamboo canopy, DON (-1.02 ± 0.55 kg N ha-1 year-1) decreased while DIN (0.35 ± 0.44 kg N ha-1 year-1) increased. This study indicates that DON and snowfall should not be neglected when evaluating total N deposition into forest ecosystems, especially in remote regions. The canopy processes related to the dissolved N in the presence of understory plants might have significant implications for the internal N cycle in forest ecosystems.

元の言語English
記事番号631
ジャーナルForests
10
発行部数8
DOI
出版物ステータスPublished - 2019 1 1

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dissolved organic nitrogen
temperate forests
temperate forest
deciduous forests
deciduous forest
understory
snow
nitrogen
canopy
bamboo
forest ecosystem
bamboos
stemflow
forest ecosystems
throughfall
forest canopy
water flow

ASJC Scopus subject areas

  • Forestry

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Nitrogen deposition and responses of forest structure to nitrogen deposition in a cool-temperate deciduous forest. / Cao, Ruoming; Chen, Siyu; Yoshitake, Shimpei; Ohtsuka, Toshiyuki.

:: Forests, 巻 10, 番号 8, 631, 01.01.2019.

研究成果: Article

Cao, Ruoming ; Chen, Siyu ; Yoshitake, Shimpei ; Ohtsuka, Toshiyuki. / Nitrogen deposition and responses of forest structure to nitrogen deposition in a cool-temperate deciduous forest. :: Forests. 2019 ; 巻 10, 番号 8.
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AB - Few studies have reported the estimation of nitrogen (N) deposition, including dissolved organic N (DON) fluxes, through water flows and the contribution of snowfall in Asia. In this study, the concentrations and fluxes of DON and dissolved inorganic N (DIN) in bulk precipitation (BP), the throughfall (TF) of trees and understory dwarf bamboo, and stemflow (SF) were evaluated in a cool-temperate forest over three years to clarify N fluxes via precipitation and responses of trees and understory canopies to N deposition. The input of N to the study site in BP was 11.1 ± 1.71 kg N ha-1 year-1, with a significant contribution from DON (78%). Snowfall fluxes contributed up to 46% of the totalNinput, with variations related to the amount of snowfall (2.08-5.52 kgNha-1 year-1). The forest canopy enriched DON (2.11 ± 0.42 kg N ha-1 year-1) but consumed NO3 + NO2-N (-0.73 ± 0.19 kg N ha-1 year-1). In contrast, through the understory bamboo canopy, DON (-1.02 ± 0.55 kg N ha-1 year-1) decreased while DIN (0.35 ± 0.44 kg N ha-1 year-1) increased. This study indicates that DON and snowfall should not be neglected when evaluating total N deposition into forest ecosystems, especially in remote regions. The canopy processes related to the dissolved N in the presence of understory plants might have significant implications for the internal N cycle in forest ecosystems.

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