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以福建省建瓯市万木林自然保护区米槠天然林为对象,定位观测了土壤甲烷吸收速率(VCH4)的季节变化.结果表明:米槠天然林土壤VCH4的季节变化表现出夏秋季高于冬春季的趋势,最大值(95.13μg·m-2·h-1)出现在初秋(9月),最小值(9.13μg·m-2·h-1)出现在初春(3月).土壤全年均为甲烷汇.随土壤温度和含水量的增加,VCH4分别呈增加和降低趋势,但VCH4与土壤温度和土壤含水量的相关性均不显著.米槠天然林土壤甲烷年通量为3.93kg·hm-2·a-1,高于全球天然林土壤甲烷年通量的平均水平(2.4kg·hm-2·a-1)和亚洲地区热带天然林土壤甲烷年通量(2.07kg·hm-2·a-1),低于亚洲地区温带天然林的土壤甲烷年通量(8.12kg·hm-2·a-1).
The seasonal changes of soil methane uptake rate (VCH4) were observed and located in the natural forest of Megalobium mongolica in Wanmulin Nature Reserve in Jian’ou City, Fujian Province.The results showed that the seasonal variation of soil VCH4 in the natural forest of Meijiu showed a trend of higher in summer and autumn In winter and spring, the maximum (95.13μg · m-2 · h-1) appeared in early autumn (September) and the lowest (9.13μg · m-2 · h-1) Methane sinks all year round.With the increase of soil temperature and water content, VCH4 increased and decreased respectively, but the correlation between VCH4 and soil temperature and soil water content was insignificant.Marxes natural forest soil annual methane flux was 3.93 kg · hm-2 · a-1, which is higher than the average level of soil methane annual flux (2.4 kg · hm-2 · a-1) in the natural forest in the world and the soil annual methane flux in the tropical natural forest in Asia (2.07 kg · Hm-2 · a-1), which is lower than annual soil methane flux (8.12kg · hm-2 · a-1) in temperate natural forests in Asia.