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鄂南棕红壤区不同植茶年限茶园CH4通量特征
引用本文:孙贇,林杉,Muhammad Shaaban,何志龙,张水清. 鄂南棕红壤区不同植茶年限茶园CH4通量特征[J]. 环境科学学报, 2017, 37(10): 3995-4003
作者姓名:孙贇  林杉  Muhammad Shaaban  何志龙  张水清
作者单位: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,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,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,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 430070,1. 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
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)
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CH_4通量,研究了不同植茶年限茶园及临近林地土壤CH_4通量特征.结果表明,不同植茶年限对茶园土壤CH_4通量有显著影响,中、低龄茶园土壤CH_4以排放为主,植茶20 a和植茶8 a茶园土壤CH_4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CH_4以吸收为主,植茶50 a茶园和林地土壤CH_4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CH_4排放,除了植茶8 a茶园外,高、中龄茶园和樟树林地土壤CH_4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CH_4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CH_4通量有不同影响,CH_4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CH_4排放通量呈降低的趋势,高龄茶园土壤为大气CH_4汇.

关 键 词:甲烷  茶园  降雨量  硝态氮
收稿时间:2017-03-01
修稿时间:2017-04-18

Characteristics of CH4 fluxes in tea field with different planting years in the brown-red soil of southern Hubei
SUN Yun,LIN Shan,Muhammad Shaaban,HE Zhilong and ZHNAG Shuiqing. Characteristics of CH4 fluxes in tea field with different planting years in the brown-red soil of southern Hubei[J]. Acta Scientiae Circumstantiae, 2017, 37(10): 3995-4003
Authors:SUN Yun  LIN Shan  Muhammad Shaaban  HE Zhilong  ZHNAG Shuiqing
Affiliation:College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070,College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070,College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070,College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070 and 1. College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070;2. Institute of Plant Nutrition and Environmental Resources Science, Henan Academy of Agricultural Sciences, Zhengzhou 450002
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.
Keywords:methane  tea field  precipitation  nitrate nitrogen
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