论文部分内容阅读
采用涡度相关法对青藏高原高寒灌丛CO2通量的观测表明,青藏高原高寒灌丛生长季和非生长季节CO2通量变化特征差异极为显著.生长季节(5~9月)08:00~19:00为CO2净吸收,19:00~08:00为CO2净排放,CO2通量峰值一般出现在12:00左右,6~9月CO2净吸收峰值分别为0.71,1.19,1.46,0.67gCO2·m?2·h?1;相对于温度,生长季CO2通量振幅更受光合有效辐射变化的影响;就月变化模式而言,8月是生长季CO2净吸收最高月份,月净吸收量达到247gCO2·m?2,整个生长季CO2净吸收的总量达583gCO2·m?2.非生长季节(1~4月及10~12月)CO2通量变化振幅极小,最大CO2净排放通量为0.30gCO2·m?2·h?1(4月),除11:00~18:00左右少量的CO2净排放以外,其余时段CO2通量均接近于零;非生长季CO2通量日变化规律,尤其是白昼CO2通量与土壤温度变化呈显著的正相关关联;4月是全年CO2净排放的最高月份,全月净排放量为105gCO2·m?2,整个非生长季CO2净排放为356gCO2·m?2.
The CO2 fluxes of the alpine shrubs in the Qinghai-Tibet Plateau using the eddy covariance method show that there are significant differences in the characteristics of CO2 fluxes during the growth and non-growth seasons of the alpine shrubs in the Qinghai-Tibet Plateau during the growing season (May-September) 19:00 for the net absorption of CO2, 19:00 ~ 08:00 for the net CO2 emissions, CO2 flux peak generally occurs at 12:00 around 6 ~ September CO2 net absorption peak were 0.71,1.19,1.46,0.67gCO2 · M · 2 · h · 1. Compared with temperature, the amplitude of CO2 flux during the growing season was more affected by photosynthetically available radiation. In terms of the monthly variation pattern, August was the highest month of net CO2 absorption in the growing season, and the net monthly absorption Reaching 247gCO2 · m · 2, the total amount of net CO2 absorption reached 583gCO2 · m · 2 during the whole growing season.The fluctuation of CO2 flux in the non-growing season (January to April and from October to December) was extremely small and the maximum CO2 net discharge The amount of CO2 flux was 0.30gCO2 · m-2 · h-1 (April). Except for a small amount of net CO2 emission around 11: 00-18: 00, the CO2 flux of other periods was close to zero; The change law, especially the daytime CO2 flux and soil temperature showed a significant positive correlation; April was the highest monthly net CO2 emission in the whole month, and the net monthly discharge was 105gCO2 · m -2. The net non-growth season CO2 net Emission is 356g CO2 · m? 2.