Please wait a minute...
J Integr Plant Biol, 1997, 39 (7): -, Research Article
Changes of Atmospheric CO2, Photosynthesis of the Grass Layer and Soil CO2 Evolution in a Typical Temperate Deciduous Forest Stand in the Mountainous Areas of Beijing
Jiang Gao-ming, Han Xing-guo and Zhou Guang-sheng
Middle-sized chambers (40 cmx 40 cmx20 cm) and an infrared gas analyzer (IRGA)were used for the measurement of net photosynthesis of the grass layer and soil CO2 evolution, in Quercus liaotungensis Koidz. forest, which is a typical temperate forest ecosystem in the mountainous areas of Beijing. Changes of CO2 concentrations in both the atmosphere (2 m above canopy) and the forest canopy (2 m below the top of the canopy) together with those of net photosynthesis and soil CO2 evolution were also examined, in order to find the characteristics of CO2 exchange between the different components of the temperate forest ecosystem and the atmosphere. Atmospheric CO2 averaged (323 ±10) and (330± 1) μmol'mo1-1 respectively in summer and autumn. During the 24-hour measurements, large differences as much as – 46 and – 61 μmol ·mol- 1 respectively in the atmosphere and forest were found. Net photosynthesis of the grass layer in summer was (2.59 ± 1.05) μmol CO2·m-2·s-1, two times of that in autumn, (1.31±0.39) μmol CO2·m-2·'s-1. In summer, there was much more CO2 evolved from soil than in autumn, averaging (5.18 ± 0.75) μmol CO2·m- 2·s- 1 and ( 1.96 ± 0.57) tanol CO2· m- 2· s- 1, respectively. A significant correlation was found between soil CO2 evolution and ground temperature, with Y = –0.864 2 + 0.310 1X, r =0.7164, P < 0.001 (n = 117). Both the minimal atmospheric CO2 level and the maximum net photosynthesis occurred around 14:00; and an increase in atmospheric CO2 and of soil CO2 evolution during night times were also found to be remarkable.
   Online on:
This Article
   Full Text  
   Full Text (PDF) 
   Supporting information
   E-mail Link to this Article
   Export Citation for this Article
Citing Articles
   Cited By
Google Scholar
   Articles by Jiang Gao-ming
   Articles by Han Xing-guo
   Articles by Zhou Guang-sheng
   Articles by Jiang Gao-ming
   Articles by Han Xing-guo
   Articles by Zhou Guang-sheng
Editorial Office, Journal of Integrative Plant Biology, Institute of Botany, CAS
No. 20 Nanxincun, Xiangshan, Beijing 100093, China
Tel: +86 10 6283 6133 Fax: +86 10 8259 2636 E-mail:
Copyright © 2020 by the Institute of Botany, the Chinese Academy of Sciences
Online ISSN: 1744-7909 Print ISSN: 1672-9072 CN: 11-5067/Q