南极菲尔德斯半岛植被微区CO2浓度的监测

在南极苔藓植被的微环境区内,CO₂的浓度在473.5mg·m^-3以上,大大高于全球CO2的平均浓度(356 mg·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,为极地温室气体的研究提供了新的材料.

Measurement of CO2 Concentration in the Areas with Vegetation Cover on the Fildes Peninsula, Antarctica

The average CO₂ concentration was above 473 5mg·m^-3 in the areas covered by moss or lichen, greatly higher than the global average CO₂ concentration, implying that these areas may be one of the atmospheric CO₂ sources. Abnormally high CO₂ concentration was relative with vegetal physiological and ecological characters.In the areas covered by moss, the daily variation of the CO₂ 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 CO₂ concentration. The seasonal variation of the CO₂ concentration was negatively correlated with atmospheric temperature and positively with rainfall and air relative humidity. This article first presents the variations of CO₂ concentration and its influential factors under the Antarctic environmental conditions, which also presents new information for the further study to the Antarctic greenhouse gases .