Knowledge Management System of Northwest Institute of Plateau Biology, CAS
| Seasonal and interannual variations of ecosystem photosynthetic features in an alpine dwarf shrubland on the Qinghai-Tibetan Plateau, China | |
| Li, H. Q.1,2; Zhang, F. W.1,2; L, Y. N., I1,2; Cao, G. M.1,2; Zhao, L.1,2; Zhao, X. Q.1,2 | |
| 2014-09-01 | |
| 发表期刊 | PHOTOSYNTHETICA
 |
| ISSN | 0300-3604 |
| 卷号 | 52期号:3页码:321-331 |
| 文章类型 | Article |
| 摘要 | Ecosystem photosynthetic characteristics are of utmost importance for the estimation of regional carbon budget, but such characteristics are not well understood in alpine regions. We collected CO2 flux data measured by eddy covariance technique over an alpine dwarf shrubland on the Qinghai-Tibetan Plateau during years 2003-2010; and we quantified the temporal patterns of ecosystem apparent quantum yield (a), saturated photosynthetic rate (P (max)), and ecosystem dark respiration (R (De)). Results showed that the strong seasonality of a and R (De) was driven mainly by air temperature (T (a)), whereas that of P (max) was much more determined by leaf area index rather than abiotic factors. Diurnal thermal fluctuation inhibited significantly the daytime photosynthetic capacity. Stepwise regression revealed that the seasonal deviations of a, P (max), and R (De) were significantly controlled by T (a). The annual a was regulated mainly by annual growing season T (a), which indicated that the response of ecosystem a was instant. The annual variations of P (max) correlated positively with soil temperature 5 cm below ground (T (s)) of the annual nongrowing season and those of R (De) related negatively with the annual nongrowing season precipitation. We suggested that a lagged response regulated the annual P (max) and the annual R (De). Annual deviations of a and R (De) were both significantly controlled by annual T (s), and those of P (max) were marginally determined by annual PPFD. Thus, the future warming scenario, especially significant for nongrowing seasonal warming in the Qinghai-Tibetan Plateau, would favor ecosystem photosynthetic capacity in the alpine dwarf shrubland.; Ecosystem photosynthetic characteristics are of utmost importance for the estimation of regional carbon budget, but such characteristics are not well understood in alpine regions. We collected CO2 flux data measured by eddy covariance technique over an alpine dwarf shrubland on the Qinghai-Tibetan Plateau during years 2003-2010; and we quantified the temporal patterns of ecosystem apparent quantum yield (a), saturated photosynthetic rate (P (max)), and ecosystem dark respiration (R (De)). Results showed that the strong seasonality of a and R (De) was driven mainly by air temperature (T (a)), whereas that of P (max) was much more determined by leaf area index rather than abiotic factors. Diurnal thermal fluctuation inhibited significantly the daytime photosynthetic capacity. Stepwise regression revealed that the seasonal deviations of a, P (max), and R (De) were significantly controlled by T (a). The annual a was regulated mainly by annual growing season T (a), which indicated that the response of ecosystem a was instant. The annual variations of P (max) correlated positively with soil temperature 5 cm below ground (T (s)) of the annual nongrowing season and those of R (De) related negatively with the annual nongrowing season precipitation. We suggested that a lagged response regulated the annual P (max) and the annual R (De). Annual deviations of a and R (De) were both significantly controlled by annual T (s), and those of P (max) were marginally determined by annual PPFD. Thus, the future warming scenario, especially significant for nongrowing seasonal warming in the Qinghai-Tibetan Plateau, would favor ecosystem photosynthetic capacity in the alpine dwarf shrubland. |
| 关键词 | Ecosystem Photosynthetic Parameters Eddy Covariance Technique Leaf Area Index Phenology Rectangular Hyperbolic Light Response |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 关键词[WOS] | CARBON-DIOXIDE EXCHANGE ; CO2 EXCHANGE ; ARCTIC TUNDRA ; GRASSLAND ECOSYSTEMS ; MEADOW ECOSYSTEM ; CLIMATE-CHANGE ; QUANTUM YIELD ; WATER-VAPOR ; NET CARBON ; TEMPERATURE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Plant Sciences |
| WOS类目 | Plant Sciences |
| WOS记录号 | WOS:000340623800001 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://210.75.249.4/handle/363003/4196 |
| 专题 | 中国科学院西北高原生物研究所 |
| 作者单位 | 1.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China 2.Chinese Acad Sci, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, H. Q.,Zhang, F. W.,L, Y. N., I,et al. Seasonal and interannual variations of ecosystem photosynthetic features in an alpine dwarf shrubland on the Qinghai-Tibetan Plateau, China[J]. PHOTOSYNTHETICA,2014,52(3):321-331. |
| APA | Li, H. Q.,Zhang, F. W.,L, Y. N., I,Cao, G. M.,Zhao, L.,&Zhao, X. Q..(2014).Seasonal and interannual variations of ecosystem photosynthetic features in an alpine dwarf shrubland on the Qinghai-Tibetan Plateau, China.PHOTOSYNTHETICA,52(3),321-331. |
| MLA | Li, H. Q.,et al."Seasonal and interannual variations of ecosystem photosynthetic features in an alpine dwarf shrubland on the Qinghai-Tibetan Plateau, China".PHOTOSYNTHETICA 52.3(2014):321-331. |
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