| 间种高粱及施用大颗粒尿素对茶园N2O排放的影响 |
| 摘要点击 1493 全文点击 437 投稿时间：2019-11-11 修订日期：2019-12-05 |
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| 中文关键词 茶园 氧化亚氮(N2O) 生物硝化抑制剂 高粱 缓释氮肥 大颗粒尿素 |
| 英文关键词 tea plantation nitrous oxide (N2O) biological nitrification inhibitor sorghum controlled release of nitrogen fertilizer big urea pill |
| 作者 | 单位 | E-mail | | 张珂彬 | 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125
中国科学院长沙农业环境观测研究站, 长沙 410125
中国科学院大学, 北京 100049 | 1398549789@qq.com | | 刘新亮 | 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125
中国科学院长沙农业环境观测研究站, 长沙 410125 | xlliu@isa.ac.cn | | 康曼 | 湖南农业大学资源环境学院, 长沙 410128 | | | 王毅 | 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125
中国科学院长沙农业环境观测研究站, 长沙 410125 | | | 沈健林 | 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125
中国科学院长沙农业环境观测研究站, 长沙 410125 | | | 李勇 | 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125
中国科学院长沙农业环境观测研究站, 长沙 410125 | yli@isa.ac.cn |
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| 中文摘要 |
| 茶园施肥量大、氧化亚氮（N2O）排放系数高，且近年来我国茶园面积不断扩大，使茶园成为重要的农业N2O排放源，亟需有效的茶园N2O减排措施.本研究在我国中亚热带典型丘陵茶园，通过设置间种高粱、施用大颗粒尿素和常规施肥3种管理措施，观测不同管理措施下茶园土壤N2O及相关环境因子动态，旨在解析茶园土壤N2O排放的主控因子和明确提出的减排措施的有效性.2 a的田间试验结果表明：①茶园土壤N2O排放通量与土壤化学性质、温度及降雨有显著的相关性，土壤物理性质和土壤化学性质的交互作用对N2O排放影响最大，土壤化学性质中的NO3--N含量是决定N2O排放量大小的最主要因素，茶园土壤N2O减排研究的工作重点在于如何减小土壤中的NO3--N含量；②间种高粱在未影响茶叶产量的前提下减少了51.2%的N2O排放，从缓解全球气候变暖角度看，间种高粱是本研究中最佳的茶园管理措施；③施用大颗粒尿素在提高29.5%的茶叶产量同时减少了34.7%的N2O排放，从兼顾经济效益及缓解全球气候变暖的角度看，茶园中施用大颗粒尿素则是本研究中最佳的施肥措施. |
| 英文摘要 |
| A large amount of fertilizers are applied to the tea plantations resulting in high nitrous oxide (N2O) emissions. The area of Chinese tea plantations has been expanding in recent years, making them an important source of agricultural N2O emissions. There is an urgent need for effective mitigation measures for N2O emissions from tea plantations. In this study, the N2O emission flux and related environmental factors are measured in Chinese mid-subtropical typical hilly tea plantation under three kinds of management measures, namely intercropping sorghum, applying big urea pills, and under conventional fertilization conditions. The aim of this experiment is to determine the main factors controlling N2O emissions from the soils of the tea plantation and confirm the true effectiveness of the proposed N2O emission mitigation measures. The results of a 2-year field experiment show that:① N2O emissions were significantly correlated with soil chemical properties, temperature and rainfall, interaction between soil physical and chemical properties; soil chemical properties have the greatest impact on soil N2O emissions. The concentration of soil NO3--N is the most important factor determining the size of N2O flux in the tea plantation. The most important task of N2O emission mitigation research in the tea plantation is to reduce the concentration of soil NO3--N; ② sorghum intercropping reduces N2O emissions by 51.2% while not affecting the tea yield. From the perspective of mitigating global warming, sorghum intercropping is the best tea plantation management measure per the results of this study; ③ applying big urea pills effectively increases tea yield while simultaneously reducing the N2O emissions by 34.7%. From the perspective of balancing economic benefits as well as mitigating global warming, application of big urea pills is undoubtedly the best tea plantation management measure as indicated by this study. |
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