Nitrous oxide (N2O) is the third largest greenhouse gas in the atmosphere after carbon dioxide and methane, mainly from agriculture. Reducing N2O emissions from the agricultural sector is crucial to achieving the 1.5 ℃ temperature control target set in the Paris Agreement. Accurately estimating and managing soil N2O emissions is the premise of designing and implementing emission reduction strategies. Acidic soil is the hot spot of atmospheric N2O emission. The problem of soil acidification in tea plantations caused by tea plants themselves and external factors has become increasingly prominent. Moreover, in order to pursue high yield, the phenomenon of excessive application of chemical fertilizers is common in the process of tea planting. However, it is not clear about the total N2O emissions caused by fertilization and its emission reduction potential in the global tea plantation.
Recently, Professor zoujianwen’s team from the school of resources and Environmental Sciences published a report on resources, Co., an authoritative journal in the field of environmental sciencenservation & Recycling published a research paper online entitled”direct N2O emissions from global tea plantations and mitigation potential by climate smart practices”, revealing the total and distribution characteristics of direct N2O emissions caused by global tea planting and fertilization, and evaluating the emission reduction potential based on climate smart measures. The results provide a basis for accurately identifying N2O emission hotspots in the agricultural sector, and provide a reference for designing agricultural non-CO2 emission reduction strategies.
This study constructed a global soil N2O emission database based on 3705 in-situ observation data from 435 articles, revealing that soil pH is a key factor in regulating the response of N2O emission to nitrogen input, and is mainly affected by climate factors. Based on this, the index model of N2O emission and nitrogen input is established by using the observed data of acid soil in tropical and subtropical climate regions. Combined with the national or county-level nitrogen application database, the direct N2O emission caused by the application of fertilizer in the global tea garden in the 1990s is estimated to be 46500 tons n/year, of which China, India and Japan are the largest emitters. For China, Sri Lanka, Kenya and Japan, N2O emissions from tea plantations account for a relatively large share of total emissions from the agricultural sector. The greenhouse gas emission intensity of tea plantation is significantly higher than that of cereal crops corn and wheat. The implementation of existing climate smart management measures can reduce about 1/3 of the N2O emissions caused by global tea plantation fertilization. The research results emphasize that accurate identification of N2O emission hot spots and implementation of targeted emission reduction measures are essential to achieve the global temperature control goal.
Associate Professor Wang Jinyang of the Academy of environmental resources and environmental protection is the first and corresponding author of the paper, and Professor Zou Jianwen is the co corresponding author. Professor Pete Smith of the University of Aberdeen in the United Kingdom and Dr. Kristel hergoualc’h, a senior researcher at the Indonesian headquarters of the International Forestry Research Center, participated in the study. The research was supported by the National Natural Science Foundation of China, the basic scientific research business fee of Central Universities and the start-up fund for the introduction of high-level talents of Nanjing Agricultural University.
Full text link:https://doi.org/10.1016/j.resconrec.2022.106501