Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow
文献类型：期刊论文
| 作者 | Gu, S. ; Tang, Y. ; Du, M. ; Cui, X. ; Kato, T. ; Li, Y. ; Zhao, X. |
| 刊名 | PHYTON-ANNALES REI BOTANICAE
 ; Gu S, Tang Y, Du M , Cui X , Kato T , Li Y, Zhao X.Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow.PHYTON-ANNALES REI BOTANICAE,2005,45(4):361-370
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| 出版日期 | 2005 |
| 英文摘要 | The alpine meadow ecosystem on the Qinghai-Tibetan Plateau is characterized by low temperatures because of its high elevation. The low-temperature environment may limit both ecosystem photosynthetic CO2 uptake and ecosystem respiration, and thus affect the net ecosystem CO2 exchange (NEE). We clarified the low-temperature constraint on photosynthesis and respiration in an alpine meadow ecosystem on the northern edge of the plateau using flux measurements obtained by the eddy covariance technique in two growing seasons. When we compared NEE during the two periods, during which the leaf area index and other environmental parameters were similar but the mean temperature differed, we found that NEE from 9 August to 10 September 2001, when the average temperature was low, was greater than that during the same period in 2002, when the average temperature was high, but the ecosystem gross primary production was similar during the two periods. Further analysis showed that ecosystem respiration was significantly higher in 2002 than in 2001 during the study period, as estimated from the relationship between temperature and nighttime ecosystem respiration. The results suggest that low temperature controlled the NEE mainly through its influence on ecosystem respiration. The annual NEE, estimated from 15 January 2002 to 14 January 2003, was about 290 g CO2 m(-2) year(-1). The optimum temperature for ecosystem NEE under light-saturated conditions was estimated to be around 15 degrees C.; The alpine meadow ecosystem on the Qinghai-Tibetan Plateau is characterized by low temperatures because of its high elevation. The low-temperature environment may limit both ecosystem photosynthetic CO2 uptake and ecosystem respiration, and thus affect the net ecosystem CO2 exchange (NEE). We clarified the low-temperature constraint on photosynthesis and respiration in an alpine meadow ecosystem on the northern edge of the plateau using flux measurements obtained by the eddy covariance technique in two growing seasons. When we compared NEE during the two periods, during which the leaf area index and other environmental parameters were similar but the mean temperature differed, we found that NEE from 9 August to 10 September 2001, when the average temperature was low, was greater than that during the same period in 2002, when the average temperature was high, but the ecosystem gross primary production was similar during the two periods. Further analysis showed that ecosystem respiration was significantly higher in 2002 than in 2001 during the study period, as estimated from the relationship between temperature and nighttime ecosystem respiration. The results suggest that low temperature controlled the NEE mainly through its influence on ecosystem respiration. The annual NEE, estimated from 15 January 2002 to 14 January 2003, was about 290 g CO2 m(-2) year(-1). The optimum temperature for ecosystem NEE under light-saturated conditions was estimated to be around 15 degrees C. |
| 源URL | [http://ir.nwipb.ac.cn/handle/363003/1308]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 推荐引用方式 GB/T 7714 | Gu, S.,Tang, Y.,Du, M.,et al. Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow[J]. PHYTON-ANNALES REI BOTANICAE, Gu S, Tang Y, Du M , Cui X , Kato T , Li Y, Zhao X.Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow.PHYTON-ANNALES REI BOTANICAE,2005,45(4):361-370,2005. |
| APA | Gu, S..,Tang, Y..,Du, M..,Cui, X..,Kato, T..,...&Zhao, X..(2005).Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow.PHYTON-ANNALES REI BOTANICAE. |
| MLA | Gu, S.,et al."Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow".PHYTON-ANNALES REI BOTANICAE (2005). |
入库方式： OAI收割
来源：西北高原生物研究所
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