| 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
0.02~0.29 g·(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。 |
| 关键词: CO2 通量 变化特征 天然草地 青海湖东北岸 |
| DOI：10.7515/JEE201003008 |
| CSTR： |
| 分类号:Q948 |
基金项目:国家科技支撑计划项目“青海湖流域生态和环境治理技术集成与试验示范”(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)
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| Natural grassland in Qinghai Lake in the northeastern coast of CO2 fluxes |
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WEI Yong-lin1,FU Yang2,LI Yue-gao1
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1. Weather Haibei Livestock Experiment Station, Haibei 810200, China;
2. Qinghai Meteorological Bureau, Xi′ning 810000, China
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| 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 07:00
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-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 fl uxes appeared in March, and was 0.29 g·(m2·h)-1. Except December and January,
the CO2 fl ux 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 signifi cant CO2 sink. |
| Key words: CO2fl ux variation characteristics natural grassland the northeastern coast of Qinghai Lake |
