• 关键词：甲烷  茶园  降雨量  硝态氮

• 基金项目：国家自然科学基金（No.41201255， 41561068）；中央高校基本科研基金（No.2662016PY098）；国家重点研发计划（No.2016YFD0300809）；河南省科技攻关项目（No.162102110010）

• 孙贇
• 华中农业大学资源与环境学院/农业部长江中下游耕地保育重点实验室, 武汉 430070

• 林杉
• 华中农业大学资源与环境学院/农业部长江中下游耕地保育重点实验室, 武汉 430070

• Muhammad Shaaban
• 华中农业大学资源与环境学院/农业部长江中下游耕地保育重点实验室, 武汉 430070

• 何志龙
• 华中农业大学资源与环境学院/农业部长江中下游耕地保育重点实验室, 武汉 430070

• 张水清
• 1. 华中农业大学资源与环境学院/农业部长江中下游耕地保育重点实验室, 武汉 430070;2. 河南省农业科学院植物营养与资源环境研究所, 郑州 450002

• 摘要：于2014年3月-2015年12月，采用静态箱-气相色谱法测定了鄂南棕红壤丘陵区茶园和樟树林地土壤CH₄通量，研究了不同植茶年限茶园及临近林地土壤CH₄通量特征.结果表明，不同植茶年限对茶园土壤CH₄通量有显著影响，中、低龄茶园土壤CH₄以排放为主，植茶20 a和植茶8 a茶园土壤CH₄累积排放量分别为0.26和0.27 kg·hm^-2，高龄茶园和对照林地土壤CH₄以吸收为主，植茶50 a茶园和林地土壤CH₄累积吸收量分别为0.39和1.95 kg·hm^-2.降雨促进了鄂南棕红壤丘陵区茶园和林地土壤CH₄排放，除了植茶8 a茶园外，高、中龄茶园和樟树林地土壤CH₄通量均与7 d累积降雨量呈显著的正相关关系.施肥造成了茶园土壤CH₄排放量增加，同时土壤中矿质氮类型对该地区茶园和林地土壤CH₄通量有不同影响，CH₄排放通量与土壤硝态氮含量呈显著正相关关系，而与铵态氮含量相关关系不显著.研究表明，降雨量是影响鄂南红壤丘陵区茶园和林地土壤甲烷通量的主要因素；随着茶园种植年限的延长，土壤CH₄排放通量呈降低的趋势，高龄茶园土壤为大气CH₄汇.

• Abstract：The CH₄ fluxes were measured from tea field and woodland in a hilly region of southern Hubei using static box from March 2014 to December 2015 and analyzed by gas chromatography. The results showed that the CH₄ flux from tea field was significantly affected by age of tea plantation. The CH₄ cumulative fluxes in the middle and low ages tea field were 0.26 and 0.27 kg·hm^-2, respectively. The aged tea field and control woodland absorbed soil CH₄. The CH₄ cumulative fluxes from the tea field of 50 plantation ages and woodland were -0.39 and -1.95 kg·hm^-2, respectively. The cumulative precipitation of the previous seven days promoted the CH₄ emission in tea field and woodland, and there was a significant positive correlation between the CH₄ flux of high and middle age tea field and woodland, except the tea field of 8 plantation ages. Fertilization resulted in increase of soil CH₄ emission in the tea field, however, the mineral nitrogen in the soil had different effects on the CH₄ flux in the tea fields and woodland. The CH₄ emission flux was positively correlated with the soil NO₃^--N content, but was not significantly correlated with soil NH₄⁺-N content. The results showed that the precipitation was the main influencing factor of CH₄ flux in the tea field and woodland in the hilly area of southern Hubei. With the extension of the planting period of the tea field, the soil CH₄ flux decreased, and therefore the oldest tea field (50-year old) was the sink for CH₄.

• Key words：methane  tea field  precipitation  nitrate nitrogen

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