【摘要】 采用涡度相关法对青海湖东北岸地区草甸化草原生态系统的CO₂通量进行了观测,结果表明:在生长季节（5—9月）,就日变化,08:00—19:00为CO₂净吸收,20:00—07:00为CO₂净排放,CO₂通量净吸收峰值一般出现在12:00时,7月份12:00时CO₂净吸收峰值为1.41 g·（m²·h）^-1;就月变化,7月是生长季CO₂净吸收最高月份,月CO₂净吸收量达到162.70 g·m^-2,整个生长季CO₂净吸收的总量达468.07 g·m^-2。非生长季节（1—4月及10—12月）,CO₂通量日变化振幅极小,最大CO₂净排放通量出现在3月,为0.29 g·（m2·h）^-1,除12月和1月各时段CO₂通量接近于零,其余月份各时段CO₂净排放在0.02⁰.29g·（m²·h）^-1;3月是全年CO₂净排放的最高月份,全月CO₂净排放量为72.33 g·m^-2,整个非生长季CO₂净排放为319.78 g·m^-2。结果表明,无放牧条件下青海湖东北岸地区草甸化草原,全年CO₂净吸收量达148.30 g·m^-2,是显著的CO₂汇。更多还原

【Abstract】 With the eddy covariance method,CO₂ flux on the northeastern coast of the Qinghai Lake area meadow steppe ecosystem was observed.The results showed that the growing season（May to September）to diurnal variation,08:00 to 19:00 was a net absorption period of CO₂,from 20:00 to 07:00for the net emissions period of CO₂,net absorption peak of CO₂ flux usually occured at 12:00,at 12:00on July the net uptake peak of CO₂ was 1.41 g·（m²·h）^-1;to month variation,July was the highest month of net uptake of CO₂ during the growing season,the monthly net absorption reached 162.70 g·m^-2,net absorption of CO₂ throughout the growing season reached a total of 468.07 g·m^-2.Non-growing season（January to April and October to December）,with the minimum amplitude of flux CO₂,the maximum net emissions of CO₂ fluxes appeared in March,and was 0.29 g·（m²·h）^-1.Except December and January,the CO₂ flux of other months was close to zero,and the net CO₂ emissions of remaining months were0.02⁰.29 g·（m²·h）^-1;March was the highest annual net emissions of CO₂,net emissions of full month was 72.33 g·m^-2.Net CO₂ emissions during the non-growing season was 319.78 g·m^-2.The results showed that under the conditions of non-grazing area of Qinghai Lake meadow grasslands in the northeastern coast,the annual net CO₂ absorption capacity of 148.30 g·m^-2,is a significant CO₂ sink.更多还原