Seasonal variation in carbon exchange and its ecological analysis over Leymus chinensis steppe in Inner Mongolia
文献类型：SCI/SSCI论文
| 作者 | Hao Y. B. ; Wang Y. F. ; Sun X. M. ; Huang X. Z. ; Cui X. Y. ; Niu H. S. ; Zhang Y. H. ; Yu G. R. |
| 发表日期 | 2006 |
| 关键词 | Leymus chinensis CO2 flux photosynthetic active radiation light saturation phenomena eddy covariance technique native tallgrass prairie net ecosystem exchange dioxide exchange water-vapor temperate grassland fluxes evapotranspiration variability atmosphere northern |
| 英文摘要 | Eddy covariance technique was used to measure carbon flux during two growing seasons in 2003 and 2004 over typical steppe in the Inner Mongolia Plateau, China. The results showed that there were two different CO2 flux diurnal patterns at the grassland ecosystem. One had a dual peak in diurnal course of CO2 fluxes with a depression of CO2 flux after noon, and the other had a single peak. In 2003, the maximum diurnal uptake and emitting value of CO2 were -7.4 and 5.4 g(.)m(-2.)d(-1) respectively and both occurred in July. While in 2004, the maximum diurnal uptake and release of CO2 were -12.8 and 5.8 g(.)m(-2.)d(-1) and occurred both in August. The grassland fixed 294.66 and 467.46 g CO(2)(.)m(-2) in 2003 and 2004, and released 333.14 and 437.17 g CO(2)(.)m(-2) in 2003 and 2004, respectively from May to September. Water availability and photosynthetic active radiation (PAR) are two important factors of controlling CO2 flux. Consecutive precipitation can cause reduction in the ability of ecosystem carbon exchange. Under favorable soil water conditions, daytime CO2 flux is dependent on PAR. CO2 flux, under soil water stress conditions, is obviously less than those under favorable soil water conditions, and there is a light saturation phenomena at PAR=1200 mu mol(.)m(-2.)s(-1). Soil respiration was temperature dependent when there was no soil water stress; otherwise, this response became accumulatively decoupled from soil temperature. |
| 出处 | Science in China Series D-Earth Sciences |
| 卷 | 49 |
| 页 | 186-195 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1006-9313 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23891]  |
| 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 | Hao Y. B.,Wang Y. F.,Sun X. M.,et al. Seasonal variation in carbon exchange and its ecological analysis over Leymus chinensis steppe in Inner Mongolia. 2006. |
入库方式： OAI收割
来源：地理科学与资源研究所
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