南极菲尔德斯半岛植被微区CO_2浓度的监测

Measurement of CO_2 Concentration in the Areas with Vegetation Cover on the Fildes Peninsula, Antarctica

在南极苔藓植被的微环境区内 ,CO2 的浓度在 4 73 5mg·m- 3以上 ,大大高于全球CO2 的平均浓度 (3 56mg·m- 3) ,可见苔藓等植被区可能是大气CO2 的源之一 .这与特殊的南极条件下植被的生理生态特性有关 .在苔藓分布区 ,CO2 浓度日变化的主要影响因素是光照和温度 .菲尔德斯半岛变化无常的天气状况使得CO2 浓度昼夜变化规律出现局部波动 ,不同的天气状况也使CO2 浓度发生变化 .研究表明 :光照条件是CO2 浓度变化的主导影响因素 ,从CO2 浓度的季节变化中可以看出 ,CO2 浓度变化与大气温度呈负相关 ;与降水量和空气相对湿度呈正相关 .本文首次给出了极地环境下植被微区的CO2 浓度变化及其影响因素 。

The average CO 2 concentration was above 473 5mg·m -3 in the areas covered by moss or lichen, greatly higher than the global average CO 2 concentration, implying that these areas may be one of the atmospheric CO 2 sources. Abnormally high CO 2 concentration was relative with vegetal physiological and ecological characters.In the areas covered by moss, the daily variation of the CO 2 concentrations was affected by sunshine and temperature and it was also different under the conditions of the different weathers. Sunshine was the main factors influencing the CO 2 concentration. The seasonal variation of the CO 2 concentration was negatively correlated with atmospheric temperature and positively with rainfall and air relative humidity. This article first presents the variations of CO 2 concentration and its influential factors under the Antarctic environmental conditions, which also presents new information for the further study to the Antarctic greenhouse gases .