摘要
利用非色散红外气体分析方法，在不受人为污染直接影响的瓦里关山进行了大气ＣＯ２的连续测量，给出了我国内陆高原大气ＣＯ２本底浓度的变化特征，观测表明内陆大气ＣＯ２随陆地植被的生长而有明显的日变化及季节的周期变化，其季节变化规律与全球大气ＣＯ２本底值的地理分布相一致．瓦里关山大气ＣＯ２的年增长率在１９９３年明显偏低，１９９４年又有较快的“回升”．地表ＣＯ２排放的观测研究还给出了冬季高原草甸土壤的排放特征，测量表明在冬季陆地植被光合作用基本停滞的情况下，土壤ＣＯ２的排放率相对增强。
By using non dispersive infrared (NDIR) method, continuous measurements of atmospheric CO 2 were carried out at Mt.Waliguan where the environment is unaffected directly by local anthropogenic pollution. The characteristics of the atmospheric background CO 2 concentration variation for the inland Plateau of China were presented in this paper. The results show that it has clearly diurnal and seasonal variations related to the grown cycle of the land vegetations, and that the pattern of seasonal variation corresponds with the global geographical distribution of atmospheric CO 2. It is found that the increase of CO 2 concentration was at a lower rate in 1993, but at a great rate in 1994. Furthermore, the emission rates of CO 2 from the Plateau grassland soil were also measured. The results show that the CO 2 emission rate from the soil surface increases relatively in winter with the largest value of above 170 mg/m 2·h when the photosynthesis of vegetation is essentially stagnant.
出处
《应用气象学报》
CSCD
北大核心
1997年第2期129-136,共8页
Journal of Applied Meteorological Science
基金
中国气象局重点科研项目
关键词
地表排放
空气污染
大气
浓度变化
二氧化碳
Atmospheric CO 2 Background concentration Variation Emission of grassland soil surface
