Journal of Ecology and Rural Environment ›› 2020, Vol. 36 ›› Issue (4): 413-424.doi: 10.19741/j.issn.1673-4831.2019.0709

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Nitrous Oxide Eemission Mechanism and Emission Mitigation Measures of Tea Plantation: A Review

ZHANG Ke-bin1,2,3, WANG Yi1,2, LIU Xin-liang1,2, KANG Man4, SHEN Jian-lin1,2, LI Yong1,2   

  1. 1. Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
    2. Changsha Research Station for Agricultural&Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. College of Resources and Environmental Science, Hunan Agricultural University, Changsha 410128, China
  • Received:2019-09-05 Online:2020-04-25 Published:2020-04-27

Abstract: Tea plantation has become an important source of agricultural nitrous oxide (N2O) emission in China due to high N2O emission factor, high application of nitrogen fertilizer and increasing planting area year by year. In 2013, the total N2O emission of tea plantations in China was estimated to be 40.90 Gg. Therefore, it is urgent to study the N2O emission mechanism and effective emission reduction measures of tea plantations. With the deepening of research on N2O emission process and influencing factors in tea plantations, many summarized emission reduction strategies are regarded as effective measures to mitigate N2O emission in tea plantations. Through the review, we found that:(1) the N2O emissionfrom tea plantations is mainly caused by soil nitrification and denitrification, and the later contricutes more;(2) the main factors affecting N2O emission in tea plantations are meteorological factors (temperature, rainfall) and soil conditions (pH, moisture content, texture, temperature, substrate concentration); (3) effective N2O emission mitigation measures in tea plantations mainly include the application of ammonium nitrogen fertilizer, controlled release nitrogen fertilizer, lime nitrogen fertilizer and deeply placing of nitrogen fertilizer; (4) there are still different opinions in the N2O emission reduction effects among applying organic fertilizer,applying biological nitrification inhibitors, adding alkaline materials, adding biomass charcoal, interplanting leguminous and applying biological fertilizers, which need to be further studied. At present, there are many researches on the influence of different agronomic measures on N2O emission characteristics in tea plantation, but there is no agreement on the effect of N2O emission reduction.This paper comprehensively analyzes the effect and mechanism of different agronomic measures on N2O emissionin tea plantation, hoping to provide theoretical and practical references for further research on N2O emissions mitigation in tea plantation.

Key words: tea plantations, N2O, nitrogen fertilizer, nitrification inhibitor, alkaline material, biomass charcoal

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