Nitrous oxide emissions from green tea fields in Japan : contribution of emissions from soil between rows and soil under the canopy of tea plants(Environment)
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概要
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This study was conducted to assess the contributions of nitrous oxide (N_2O) emissions from soil between rows and soil under the canopy of tea plants (Camellia sinensis (L.) Kuntze) to the entire N_2O emissions from tea fields and to determine the factors responsible for changes in N_2O emissions. The study was performed in an experimental tea field in which fertilizer application rate was 510kg nitrogen (N) ha^<-1> yr^<-1>. N_2O flux and soil properties including temperature, water filled pore space (WFPS), ammonium-nitrogen (NH^+_4-N) and nitrate-nitrogen (NO^-_3-N) concentrations, and soil pH were measured over a period of two years. Total N_2O emissions from the entire tea field were 10.6 and 14.8kg ha^<-1> yr^<-1> in 2008 and 2009, respectively. Total N_2O emissions from soil under the canopy of tea plants were approximately 35% of the total N_2O emissions from the entire tea field, suggesting that the contribution of N_2O emission from soil under the canopy of tea plants to overall N_2O emission was not negligible. A high N_2O flux from soil under the canopy was observed when there was heavy rainfall. The key factors for high N_2O fluxes observed in soil under the canopy were considered to be increases in soil temperature and WFPS. On the other hand, high N_2O fluxes from the soil between rows was observed after fertilizer application in spring and autumn, and there was a significant positive correlation between N_2O flux and NH^+_4-N concentration in the soil between rows.
- 2012-06-00
著者
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HIRONO Yuhei
NARO Institute of Vegetable and Tea Science
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NONAKA Kunihiko
NARO Institute of Vegetable and Tea Science