| 1 | Temporal variations of CO_2 concentration near land surface and its response to meteorological variables in Heihe River Basin, northwest China显示文摘Atmospheric CO2 concentration (CC) near land surface and meteorologica l variables have been measured at four sites, named Yeniugou (alpine meadow and permafrost), Xishui (mountainous forest), Linze (oasis edge) and Ejina (lower de sert), respectively, in Heihe River Basin, northwest China. The results showed t hat, the half hourly CC at night was larger than in daytime, and the daily avera ged CC was the largest in winter. The averaged CC of 932 d at the Linze was abou t 418 ppm, was about 366 ppm in the 762 d at the Ejina. In the same period from September 23 to November 9, 2004, the averaged CC was about 625, 334, 436 and 35 3 ppm, at Yeniugou, Xishui, Linze and Ejina, respectively. The linear relationsh ip between daily averaged CC and air temperature T was negative, between CC and relative humidity (RH) was positive. The linear CC-atmospheric pressure (AP) rel ationship was negative at the Linze and Yeniugou, was positive at the Ejina. The relationship between CC and global radiation R was exponent, and soil temperatu re Ts was negative linear, and soil water content was complex. The correlation b etween CC and wind speed was not existent. Using meteorological variables togeth er to simulate CC, could give good results. | CHEN Ren-sheng KANG Er-si JI Xi-bin YANG Jian-ping ZHANG Zhi-hui YANG Yong | 2006 | Journal of Environmental Sciences2006，18，4： | 0 |
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