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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.
From March 2014 to December 2015, CH_4 flux of tea plantation and camphor woodland soil in red-brown hilly area of Hubei province was determined by static box-gas chromatography. The characteristics of CH_4 flux in tea plantation and adjacent woodland in different planting years were studied The results showed that different years of tea plantation had a significant effect on the CH_4 flux in the tea plantation soils, and the emissions of CH_4 in the tea plantations of medium and young age were the major ones, while the emissions of CH_4 in the 20 years of tea plantation and the tea plantation of 8 a were 0.26 and 0.27 kg · Hm ~ (-2), CH_4 in the tea garden and the control forest were mainly absorbed, and the cumulative CH_4 uptake in the tea plantation and woodland for 50 years were 0.39 and 1.95 kg · hm -2, respectively In addition to the 8-year tea plantation, the CH 4 fluxes in high, middle-aged tea plantations and camphor woodland soil had a significant positive correlation with the accumulated rainfall at 7 days in the red soil hilly region of South Red soil CH_4 emission. While CH4 emission in soil increased. At the same time, mineral nitrogen types in soil had different effects on CH4 flux in tea plantation and woodland in this area. CH4 flux had a significant positive correlation with soil nitrate nitrogen content, but had a positive correlation with ammonium nitrogen content Not significant. Research shows that drop The amount of the main factors affecting E’nan Red Tea Garden hilly forest soil methane fluxes; With the extension of the life of tea garden soil CH_4 fluxes tended to decrease, tea garden soil elderly atmospheric CH_4 sink.