作　　者： ; ; ; ; ;

机构地区： 中国科学院华南植物园

出　　处： 《中国环境科学》 2004年第6期688-691,共4页

摘　　要： 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N2O 通量进行了 1 年的原位观测和研究.结果表明,3 种林型地表 N2O 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 N2O 通量差异与森林土壤的性质有密切关系,C/N 比值较低的季风林凋落叶对土壤中产生N2O 的微生物过程有较为明显的促进作用;从全年来看,松林地表N2O 通量的季节变化不明显,而季风林和混交林的地表 N2O 通量在雨季存在明显的降雨驱动效应,统计分析显示在该地区影响森林地表N2O 通量的主要因子是土壤湿度. The N2O fluxes from soils of three types of forest with different stages of succession in Dinghushan (monsoon evergreen broad-leaved forest, coniferous and broad-leaved mixed forest and pine forest) were observed in situ for one year using static chamber-gas chromatograph technique. In order of N2O amount, these three types of forest was monsoon forest >mixed forest >pine forest. The difference of N2O flux among the different forests had close correlation with their soil properties; litter in the monsoon forest of lower C/N ratio had more obvious promotion action on the microbe process of N2O production in soil. On the whole year, the seasonal change of N2O flux from soil of pine forest was not obvious, but the N2O fluxes from soils of mixed forest and pine forest had dominant driving effect of precipitation in rain season. The statistic analysis showed that the key factor affecting the N2O flux from soil in this area is soil moisture.

关 键 词： 鼎湖山 通量 凋落物 季节动态

领　　域： [环境科学与工程]