摘要
利用IRGA法和GC法,同步观测了3种天气(晴天、多云、阴天)条件下福州市江滨公园马尼拉草坪生态系统CO2净交换量(NEE)的白昼动态变化,比较IRGA法和GC法透明通量箱对观测样点环境的影响程度,并探讨其对NEE观测结果的影响.结果表明:在单次观测结束时,IRGA法通量箱对样点环境的扰动小于GC法,晴天白天二者箱内的平均升温分别为1.79℃和2.33℃,箱内平均光合有效辐射(PAR)降低幅度分别为11.00%和21.00%.3种天气情况下,IRGA法与GC法观测的NEE白天变化趋势较一致,但3种天气相同时段内GC法测定的NEE平均值比IRGA法高3.17μmol·m-2·s-1,二者的差异在中午最大,在清晨和傍晚较小.IRGA法比GC法可以更为准确地测量草坪NEE.
Based on the measurement of CO2 net ecosystem exchange by the methods of chamber/infrared gas analyze （IRGA method） and static chamber/gas chromatogram （GC method）, a comparison was made between the two methods in the evaluation of COE net ecosystem exchange （NEE） over turfgrass （Zoysia matrella） in Riverbank Park of Fuzhou city during daytime under different kinds of weather, and the chambers＇ influence on natural conditions of two methods was measured. The results showed that the IRGA chamber had less influence on natural conditions than the GC chamber. The daily mean value of temperature difference which between the inside and the outside of the chamber of IRGA method and GC method were 1.79 ℃ and 2.33 ℃ respectively after the chamber was closed in different periods of time in clearness day. And the mean value of photosynthetically active radiation in IRGA chamber and GC chamber were 11.00% and 21.00% respectively lower than the outside. Under three different kinds of weather, the hour mean value of NEE was lower in IRGA method than in GC method, but the daytime pattern was similar. The hour mean value of three days was 3.17 μmol.m^-2 . s^-1 higher in GC method than in IRGA method. The variance between the hours mean values of NEE obtained from two methods was higher in midday than in morning and dusk. The study concluded that IRGA method is more accurate than GC method in measuring NEE of lawn ecosystem.
出处
《亚热带资源与环境学报》
2008年第4期16-22,共7页
Journal of Subtropical Resources and Environment
基金
福建省自然科学基金资助项目(2007J0346)
福建省教育厅科学基金资助项目(JB07069)
福建师范大学地理科学院研究生科研创新基金
关键词
CO2
净生态系统交换量
IRGA法
GC法
草坪
CO2 net ecosystem exchange
chamber/infrared gas analyze
static chamber/gas chro-matogram
turfgrass
