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CO_2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CO_2净吸收,20:00—07:00为CO_2净排放,CO_2通量净吸收峰值一般出现在12:00时,7月份12:00时CO_2净吸收峰值为1.41 g·(m^2·h)^(-1);就月变化,7月是生长季CO_2净吸收最高月份,月CO_2净吸收量达到162.70 g·m^(-2),整个生长季CO_2净吸收的总量达468.07 g·m^(-2)。非生长季节(1—4月及10—12月),CO_2通量日变化振幅极小,最大CO_2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CO_2通量接近于零,其余月份各时段CO_2净排放在0.02~0.29g·(m^2·h)^(-1);3月是全年CO_2净排放的最高月份,全月CO_2净排放量为72.33 g·m^(-2),整个非生长季CO_2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CO_2净吸收量达148.30 g·m^(-2),是显著的CO_2汇。
With the eddy covariance method, CO2 flux on the northeastem 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 07：00 for the net emissions period of CO2, net absorption peak of CO2 flux usually occured at 12：00, at 12：00 on 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：, 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 were 0.02-0.29 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.
出处
《地球环境学报》
2010年第3期208-212,共5页
Journal of Earth Environment
基金
国家科技支撑计划(2007BAC30B00)
成都高原气象开放实验室基金"环青海湖地区典型生态监测试验及评价方法研究"(LPM2009018)
关键词
CO2通量
变化特征
天然草地
青海湖东北岸
CO2 C flux
variation characteristics
natural grassland
the northeastern coast of Qinghai Lake
