鼎湖山主要森林生态系统地表CH4通量

利用静态箱-气相色谱法对鼎湖山3种处于演替不同阶段的森林类型-季风常绿阔叶林、针阔叶混交林和马尾松林-的地表CH4通量进行了为期一年的原位观测和研究,结果表明:3种林型地表吸收CH4通量按从大到小的顺序为:季风林>混交林>松林,不同林型间的CH4通量差异与森林土壤的性质有密切关系,即土壤容重越小、有机质含量与土壤温度和湿度都没有明显的相关性,但在旱季土壤温度成为控制地表CH4通量的主要因子。

The CH4 uptake flux by soils of main forest ecosystems in Dinghushan

The CH4 uptake flux by soils of three types of forest in Dinghushan reserve--monsoon evergreen broad-leaved forest,coniferous and broad-leaved mixed forest and pine forest,which are in different stages of vegetation succession--were measured for one year by using static chamber-gas chromatograph technique.Highest CH4 uptake flux was found for monsoon forest,then followed by mixed forest and pine forest.The difference of CH4 flux among the different forests closely relates to their soil properties.That is,the lower soil bulk density is and the more soil organic matter is,the higher CH4 uptake flux by soil is.Litter on the soil surface had little effect on the CH4 flux for the three forests.CH4 uptake fluxes did not show any significant dependency on soil temperature and soil moisture through the whole year,but soil temperature had positive effect on CH4 uptake flux during dry season.