稻田生态系统甲烷排放的机理研究  

Advances in Mechanisms Research of Methane Emission from the Rice Ecosystem

作　　者：李晶[1] 王明星[1] 郑循华[1] 沈壬兴[1] 

机构地区：[1]中国科学院大气物理研究所

出　　处：《中国基础科学》2000年第7期19-23,共5页China Basic Science

摘　　要：本文介绍了获得中科院自然科学一等奖的“稻田生态系统甲烷产生、转化及传输机理研究”的主要内容和取得的主要进展。通过对中国主要水稻产区稻田甲烷排放的多年观测实验,描述了稻田甲烷排放的时空变化规律及特征并分析研究了其形成机理。土壤中的甲烷通过3个路径向大气排放,不同时期3个路径在甲烷传输中的相对重要性不同。利用数值模式估算出中国的稻田甲烷排放9.67—12.66Tg/a,全球稻田甲烷的总排放量约为35—56Tg/a。Main advances in the program 'Production, transformation and transport mechanism of methane in the rice ecosystem' which won the first prize of CAS Natural Science Award are introduced in this paper. CH4 emission rates from Chinese rice fields have been measured in major rice culture regions in China. Characteristics of diurnal and seasonal variation of CH4 emission rates have been found and the mechanisms are analyzed. CH4 transport through rice plant, gas bubble and diffusion in flooded water. Relative importance of each route is different in different stages during rice growing. China' s rice fields contribute about 9.67-12.66TgCH4/a to the atomosphere. The total methane emission from global rice fields can be estimated as 35-56 TgCH4/a.

关 键 词：大气 甲烷 稻田生态系统 甲烷排放 排放机理 

分 类 号：P401[天文地球—大气物理学与大气环境]