Establishment of apparent quantum yield and maximum ecosystem assimilation on Tibetan Plateau alpine meadow ecosystem
文献类型：SCI/SSCI论文
| 作者 | Xu L. L. ; Zhang X. Z. ; Shi P. L. ; Yu G. R. |
| 发表日期 | 2005 |
| 关键词 | Tibetan Plateau alpine meadow ecosystem eddy covariance apparent quantum yield maximum ecosystem assimilation carbon-dioxide exchange atmosphere radiation grassland |
| 英文摘要 | The alpine meadow is widely distributed on the Tibetan Plateau with an area of about 1.2X 10(6) km(2). Damxung County, located in the hinterland of the Tibetan Plateau, is the place covered with this typical vegetation. An open-path eddy covariance system was set up in Damxung rangeland station to measure the carbon flux of alpine meadow from July to October, 2003. The continuous carbon flux data were used to analyze the relationship between net ecosystem carbon dioxide exchange (NEE) and photosynthetically active radiation (PAR), as well as the seasonal patterns of apparent quantum yield (a) and maximum ecosystem assimilation (P-max). Results showed that the daytime NEE fitted fairly well with the PAR in a rectangular hyperbola function, with a declining in the order of peak growth period (0.0244 mu molCO(2) . mu mol(-1) PAR) > early growth period > seed maturing period > withering period (0.0098 mu molCO(2) . mu mol(-1) PAR). The Pmx did not change greatly during the first three periods, with an average of 0.433 MgCO2 . m(-2) . s(-1), i.e. 9.829 mu molCO(2) . m(-2) . s(-1). However, during the withering period, Fmax was only 0.35 MgCO2 . m(-2) . s(-1), i.e. 7.945 mu molCO(2) . m(-2) . s(-1). Compared with other grassland ecosystems, the a of the Tibetan Plateau alpine meadow ecosystem was much lower. |
| 出处 | Science in China Series D-Earth Sciences |
| 卷 | 48 |
| 页 | 141-147 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1006-9313 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22666]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Xu L. L.,Zhang X. Z.,Shi P. L.,et al. Establishment of apparent quantum yield and maximum ecosystem assimilation on Tibetan Plateau alpine meadow ecosystem. 2005. |
入库方式： OAI收割
来源：地理科学与资源研究所
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