Daily variation characteristics of CO2 emission fluxes and contributions of environmental factors in semiarid grassland of Inner Mongolia, China
文献类型：SCI/SSCI论文
| 作者 | Qi Y. C. ; Dong Y. S. ; Liu J. Y. ; Geng Y. B. ; Li M. F. ; Yang X. H. ; Liu L. X. |
| 发表日期 | 2005 |
| 关键词 | Inner Mongolia Aneurolepidium chinense steppe CO2 emission flux daily variation environmental factors carbon-dioxide fluxes xilin river-basin soil respiration tallgrass prairie northern biomass plains forest |
| 英文摘要 | Fixed field experimental studies are carried out on daily variations of the undisturbed community and soil respiration fluxes in different phenological phases of 2001-2002 in semiarid Aneurolepidium chinense steppe of Inner Mongolia, China using static black chamber method. Corresponding statistical analysis of the contributions of the water-heat factors (air temperature, ground temperature, surface soil water content) and ecological factors (above-ground biomass, underground biomass, litter biomass) to daily variation law of the undisturbed community and soil respiration fluxes as well as differences in daily respiration are also conducted. The results indicate that undisturbed community and soil respiration have apparent daily variation laws, daily variation patterns of respiration fluxes during different phenological phases are basically the same, and the variations of environmental factors only exert effect on CO2 emission intensities, while the effect on daily variation pattern of grassland CO2 emission fluxes is relatively small. The daily total respiration of the undisturbed community in different phenological phases ranges from 1.34-10.13 g(.)m(-2); soil daily total respiration ranges from 0.98-5.17 g(.)m(-2); both daily variations of undisturbed community and soil respiration fluxes are significantly correlated (p < 0.05) or extremely significantly correlated (p < 0.01) with air temperatures and ground surface temperatures, but the correlativity with the soil temperature at 5 and 10 cm depths is relatively weak; multiple regression analysis indicates that about 80% of the difference in daily respiration of the undisturbed community among different phenological phases is induced by the variation of the aboveground biomass, while the variations of the remaining factors can jointly explain around 20% of the daily respiration variations of the whole grassland ecosystem; about 83% of the soil daily respiration variation of the different phenological phases is caused by 0-20 cm underground biomass. Besides, surface soil water content is also an important environmental factor affecting soil daily respiration variations of the Aneurolepidium chinense steppe, but its partial correlation coefficient with soil daily respiration amount does not reach the significance level of 0.05. |
| 出处 | Science in China Series D-Earth Sciences |
| 卷 | 48 |
| 期 | 7 |
| 页 | 1052-1064 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1006-9313 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23188]  |
| 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 | Qi Y. C.,Dong Y. S.,Liu J. Y.,et al. Daily variation characteristics of CO2 emission fluxes and contributions of environmental factors in semiarid grassland of Inner Mongolia, China. 2005. |
入库方式： OAI收割
来源：地理科学与资源研究所
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