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| Nitrous oxide emission and its impact factors in tea garden and woodland soils in subtropical hilly region of China during spring season |
| Received:December 22, 2015 |
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| KeyWord:tea garden;N2O emission;mineral nitrogen;temperature;rainfall |
| Author Name | Affiliation | E-mail | | HE Zhi-long | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | | | ZHOU Wei | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | | | TIAN Ya-nan | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | | | Muhammad Shaaban | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | | | LIN Shan | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | linshan@mail.hzau.edu.cn |
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| 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 during 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 emission(0.22 kg N2O-N·hm-2) was found in the woodland. Soil N2O flux had a significant positive correlation with soil NO3--N concentration under tea field of two plantation ages(P < 0.05), whereas soil N2O flux was significantly correlated with soil NH4+-N concentration in woodland(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 NO3--N concentration and soil temperature, while 55% of the variability in the N2O flux from woodland soil could be explained by the concentration of NH4+-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. |
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