Nitrous oxide emissions from green tea fields in Japan: contribution of emissions from soil between rows and soil under the canopy of tea plants

摘要

This study was conducted to assess the contributions of nitrous oxide (N₂O) emissions from soil between rows and soil under the canopy of tea plants (Camellia sinensis (L.) Kuntze) to the entire N₂O emissions from tea fields and to determine the factors responsible for changes in N₂O emissions. The study was performed in an experimental tea field in which fertilizer application rate was 510a??kg nitrogen (N) haa??1a??yra??1. N₂O flux and soil properties including temperature, water filled pore space (WFPS), ammonium-nitrogen (-N) and nitrate-nitrogen (-N) concentrations, and soil pH were measured over a period of two years. Total N₂O emissions from the entire tea field were 10.6 and 14.8a??kg haa??1a??yra??1 in 2008 and 2009, respectively. Total N₂O emissions from soil under the canopy of tea plants were approximately 35% of the total N₂O emissions from the entire tea field, suggesting that the contribution of N₂O emission from soil under the canopy of tea plants to overall N₂O emission was not negligible. A high N₂O flux from soil under the canopy was observed when there was heavy rainfall. The key factors for high N₂O fluxes observed in soil under the canopy were considered to be increases in soil temperature and WFPS. On the other hand, high N₂O fluxes from the soil between rows was observed after fertilizer application in spring and autumn, and there was a significant positive correlation between N₂O flux and -N concentration in the soil between rows.View full textDownload full textKeywordsacid soil, fallen leaves, nitrogen cycle, nitrous oxide, tea.Related var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00380768.2012.686434