Seasonal variations and mechanism for environmental control of NEE of CO2 concerning the Potentilla fruticosa in alpine shrub meadow of Qinghai-Tibet Plateau
文献类型：SCI/SSCI论文
| 作者 | Li Y. N. ; Sun X. M. ; Zhao X. Q. ; Zhao L. ; Xu S. X. ; Gu S. ; Zhang F. W. ; Yu G. R. |
| 发表日期 | 2006 |
| 关键词 | Potentilla fruticosa shrub meadow yearly meteorological conditions CO2 exchange variations meteorological factors aboveground and belowground biomass LAI carbon-dioxide exchange flux measurements forest ecosystems atmosphere northern rates |
| 英文摘要 | The study by the eddy covariance technique in the alpine shrub meadow of the Qinghai-Tibet Plateau in 2003 and 2004 showed that the net ecosystem carbon dioxide exchange (NEE) exhibited noticeable diurnal and annual variations, with more distinct daily changes during the warmer seasons. The CO2 emission of the shrub ecosystem culminated in April and September while the CO2 absorption capacity reached a maximum in July and August. The absorbed carbon dioxide during the two consecutive years was 231.4 and 274.8 g CO(2)(.)m(-2) respectively, yielding an average of 253.1 gCO(2)(.)m(-2) per year: that accounts for a large proportion of absorbed CO2 in the region. Obviously, the diurnal carbon flux was negatively related to temperature, radiation and other atmospheric factors. Still, minute discrepancies in kurtosis and duration of carbon emission/absorption were detected between 2003 and 2004. It was found that the CO2 flux in the daytime was similarly affected by photosynthetic photon flux density in both years. Temperature appears to be the most important determinant of CO2 flux: specifically, the high temperature during the plant growing season inhibits the carbon absorption capacity. One potential explanation is that soil respiration is enhanced under such condition. Analysis of biomass revealed that the annual net carbon fixed capacity of aboveground and belowground biomass was 544.0 in 2003 and 559.4 g C(.)m(-2) in 2004, which coincided with the NEE absorption capacity (63.1 g C(.)m(-2) in 2003 and 74.9 g C(.)m(-2) in 2004) in the corresponding plant growing season. |
| 出处 | Science in China Series D-Earth Sciences |
| 卷 | 49 |
| 页 | 174-185 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1006-9313 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23583]  |
| 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 | Li Y. N.,Sun X. M.,Zhao X. Q.,et al. Seasonal variations and mechanism for environmental control of NEE of CO2 concerning the Potentilla fruticosa in alpine shrub meadow of Qinghai-Tibet Plateau. 2006. |
入库方式： OAI收割
来源：地理科学与资源研究所
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