摘要
本文建立了一个区域尺度稻田生态系统ＣＨ４排放的初步模式，该模式能从理论上反映稻田ＣＨ４产生、传输与排放的机理，并提供了一种估计不同区域气候和土壤条件下稻田生态系统ＣＨ４排放总量的有效方法。模式主要包括三个部分：水稻的生长、土壤有机物的分解和ＣＨ４的产生、传输及排放过程。模式分别模拟了早稻和晚稻ＣＨ４的排放，模拟结果与实测比较接近，ＣＨ４的季平均排放量，模拟值与实测值的偏差在１０％左右。模式的敏感性实验表明，温度是稻田ＣＨ４排放规律的主要控制因子。
A preliminary numerical model is built to describe the production and subsequent transport of methane in rice fields. The model embodies the effect of weather condition and acme field managements on the methane emission rate. The model includes three major segments which are highly interactive in nature; growth of rice, decomposition of soil organic matter and production, transportation and emission of methane. Explicit equations for modeling each segment mentioned above are given. The main results are:1) The seasonal variation of methane emission obtained from t.he model quite agrees with that from field experiments. The difference of seasonal average methane emission rate between modeling value and experiment data is about 10%. 2) During the whole rice growing period, the seasonal variation of transport abilitity of rice plant in model calculation is similiar to the experiment data. It increases with time and reaches maximum during the stage in the middle of heading. 3) The content of soil organic matter is one of the major factors which determines methane average emission rate, and temperature controls the trend of methane emission from rice fields.
出处
《大气科学》
CSCD
北大核心
1995年第6期733-740,共8页
Chinese Journal of Atmospheric Sciences
基金
国家攀登计划
