农业资源与环境学报2016，Vol.35Issue(6)：1210-1217,8.DOI:10.11654/jaes.2016.06.026
中亚热带丘陵区茶园和林地土壤春季2排放及其影响因素
Nitrous oxide emission and its impact factors in tea garden and woodland soils in subtropical hilly region of China during spring season
摘要
Abstract
In the central subtropical region of China, more rain events and higher fertilization rates make tea field soil become a larger source of N2O emissions in the spring season. Therefore, it is necessary to investigate soil N2O fluxes and related influencing factors under tea field in spring. This study measured the N2O emission characteristics and environmental factors of soils from tea fields with two plantation ages in a hilly region, using static chamber and gas chromatography technique. At the same time, N2O emissions in woodland were also measured. Results showed that the highest cumulative N2O emission(2.07 kg N2O-N·hm-2)was observed in the tea field of 50 years of plantation dur-ing the experimental period(spring), followed by the tea field(1.39 kg N2O-N·hm-2)of 20 years of plantation. The lowest cumulative N2O e-mission(0.22 kg N2O-N·hm-2)was found in the woodland. Soil N2O flux had a significant positive correlation with soil NO-3-N concentration under tea field of two plantation ages(P<0.05), whereas soil N2O flux was significantly correlated with soil NH+4-N concentration in wood-land(P<0.01). The cumulative precipitation during the previous five days was found to be significantly correlated with soil N2O fluxes under both tea field and woodland(P<0.05). Stepwise regression analysis showed that 48%~49%of the variability in the N2O flux from tea field soil could be explained by NO-3-N concentration and soil temperature, while 55%of the variability in the N2O flux from woodland soil could be explained by the concentration of NH+4-N and soil temperature. These results indicate that fertilizer induced N2O fluxes from tea field soils is related with rain events during the spring period.关键词
茶园/氧化亚氮排放/矿质态氮/温度/降雨量Key words
tea garden/N2O emission/mineral nitrogen/temperature/rainfall分类
环境科学引用本文复制引用
何志龙,周维,田亚男,Muhammad Shaaban,林杉..中亚热带丘陵区茶园和林地土壤春季2排放及其影响因素[J].农业资源与环境学报,2016,35(6):1210-1217,8.基金项目
国家自然科学基金项目（41201255，41171212）；教育部创新团队课题（IRT1247）；河南省农业科学院自主创新专项基金 （）
