| 来源类型 | Article |
| 规范类型 | 其他 |
| DOI | 10.5194/esd-6-485-2015 |
| Modelling short-term variability in carbon and water exchange in a temperate Scots pine forest. | |
| Vermeulen MH; Kruijt BJ; Hickler T; Kabat P | |
| 发表日期 | 2015 |
| 出处 | Earth System Dynamics 6: 485-503 |
| 出版年 | 2015 |
| 语种 | 英语 |
| 摘要 | The vegetation-atmosphere carbon and water exchange at one particular site can strongly vary from year to year, and understanding this interannual variability in carbon and water exchange (IAVcw) is a critical factor in projecting future ecosystem changes. However, the mechanisms driving this IAVcw are not well understood. We used data on carbon ad water fluxes from a multi-year eddy covariance study (1997.2009) in a Dutch Scots pine forest and forced a process-based cosystem model (Lund- Potsdam-Jena General Ecosystem Simulator; LPJ-GUESS) with local data to, firstly, test whether the moel can explain IAVcw and seasonal carbon and water exchange from direct environmental factors only. Initial model runs showed how correlations with estimated annual gross primary productivity (GPP) and annual actual evapotranspiration (AET), while monthly and daily fluxes showed high correlations. The model underestimated GPP and AET during winter and drought events. Secondly, we adapted the temperature inhibition function of photosynthesis to account for the observation that at this particular site, trees continue to assimilate at very low atmospheric temperatures (up to daily averages of -10 degrees C), resulting in a net carbon sink in winter. While we were able to improve daily and monthly simulations during winter by lowering the modelled minimum temperature threshold for photsynthesis, this did not increase explained IAVcw at the site. Thirdly, we implemented three alternative hypotheses concerning water uptake by plants in order revealed a strong sensitivity of the modelled fluxes during dry and warm conditions, but no single forulation was consistently superior in reproducing the data for all timescales and the overall model-data match for IAVcw could not be improved. Most probably access to deep soil water leads to higher AET and GPP simulated during the heatwave of 2003. We conclude that potosynthesis at lower temperatures than assumed in most models can be important for winter carbon and water fluxes in pine forests. Furthermore, details of the model representations of water uptake, which are often overlooked, need further attention, and deep water access should be treated explicitly. |
| 主题 | Water (WAT) |
| URL | http://pure.iiasa.ac.at/id/eprint/11406/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 引用统计 | |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/130190 |
| 推荐引用方式 GB/T 7714 | Vermeulen MH,Kruijt BJ,Hickler T,et al. Modelling short-term variability in carbon and water exchange in a temperate Scots pine forest.. 2015. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| esd-6-485-2015.pdf（1264KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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