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Copyright of Advances in New & Renewable Energy is the property of Editorial Office of Advances in New & Renewable Energy and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China Normal University (Natural Science Edition) / Huanan Shifan Daxue Xuebao (Ziran Kexue Ban) is the property of Journal of South China Normal University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Farmer and soil surveys were conducted to explore the nitrogen balance and greenhouse gas emission reduction potential in typical Oolong tea gardens. Based on the Boundary line approach，survey data from 355 farmers and 207 soil tests in tea gardens of Anxi Coun⁃ ty and Wuyishan City in Fujian Province from 2015 to 2017 were collected to analyze the characteristics of nitrogen fertilizer application， nitrogen balance，and greenhouse gas emission reduction potential. The results showed that the average amount of nitrogen fertilizer input in Anxi County tea gardens was 509.4 kg·hm-2，mainly from compound fertilizer and urea，and the annual nitrogen surplus was 479.1 kg· hm-2. The average amount of nitrogen fertilizer input in tea gardens in Wuyishan City was 218.1 kg·hm-2，mostly from compound fertilizer， and the annual nitrogen surplus was 189.8 kg·hm-2. There was a significant positive correlation between nitrogen input and nitrogen nutri⁃ ent surplus. With the increase of nitrogen surplus，soil total nitrogen content also increased，and the total nitrogen content of tea gardens in Anxi County was higher than that in Wuyishan City. Based on the Boundary line method，the optimal nitrogen fertilizer application rate in tea gardens of Anxi County and Wuyishan City was 411.3 kg·hm-2 and 157.7 kg·hm-2，respectively. The greenhouse gas emission could be reduced by 62.0% and 68.0% respectively by optimizing the input and management level of nitrogen fertilizer. This study demonstrated that excessive application of nitrogen fertilizer leaded to high surplus of nitrogen in the Oolong tea gardens of Anxi County and Wuyishan City in Fujian Province. The amount of nitrogen fertilizer should be optimized to reduce excessive surplus of nitrogen and reduce greenhouse gas emissions from tea garden. [ABSTRACT FROM AUTHOR]