Nitrogen Deposition and Responses of Forest Structure to Nitrogen Deposition in a Cool-Temperate Deciduous Forest
| Autor: | Shinpei Yoshitake, Ruoming Cao, Toshiyuki Ohtsuka, Siyu Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Canopy
Takayama forest Tree canopy Stemflow 010504 meteorology & atmospheric sciences Forestry lcsh:QK900-989 Understory 010501 environmental sciences Throughfall Temperate deciduous forest dissolved organic nitrogen 01 natural sciences net throughfall Agronomy understory stemflow dissolved inorganic nitrogen Forest ecology lcsh:Plant ecology Environmental science throughfall Deposition (chemistry) 0105 earth and related environmental sciences |
| Zdroj: | Forests Volume 10 Issue 8 Forests, Vol 10, Iss 8, p 631 (2019) |
| ISSN: | 1999-4907 |
| DOI: | 10.3390/f10080631 |
| Popis: | 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&minus 1 year&minus 1, with a significant contribution from DON (78%). Snowfall fluxes contributed up to 46% of the total N input, with variations related to the amount of snowfall (2.08&ndash 5.52 kg N ha&minus 1). The forest canopy enriched DON (2.11 ± 0.42 kg N ha&minus 1) but consumed NO3 + NO2&ndash N (&minus 0.73 ± 0.19 kg N ha&minus 1). In contrast, through the understory bamboo canopy, DON (&minus 1.02 ± 0.55 kg N ha&minus 1) decreased while DIN (0.35 ± 0.44 kg N ha&minus 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. |
| Databáze: | OpenAIRE |
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