Simulating forest productivity along a neotropical elevational transect: temperature variation and carbon use efficiency
Simulating forest productivity along a neotropical elevational transect: temperature variation and carbon use efficiency
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DOI：
10.1111/j.1365-2486.2012.02728.x
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发表时间：
2012-04
影响因子：
11.6
通讯作者：
T. Marthews;Y. Malhi;C. Girardin;J. S. Silva Espejo;L. Aragão;D. Metcalfe;J. Rapp;L. Mercado;R. Fisher;David R. Galbraith;J. Fisher;Norma Salinas-Revilla;A. Friend;N. Restrepo-Coupe;Richard J. Williams
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作者：
T. Marthews;Y. Malhi;C. Girardin;J. S. Silva Espejo;L. Aragão;D. Metcalfe;J. Rapp;L. Mercado;R. Fisher;David R. Galbraith;J. Fisher;Norma Salinas-Revilla;A. Friend;N. Restrepo-Coupe;Richard J. Williams
更好地了解控制热带森林生态系统中碳成分的大小和符号的机制，对于可靠地估计全球碳循环的这一重要区域组成部分至关重要。我们使用的JULES植被模型模拟所有组件的碳平衡在六个站点沿着一个安第斯山脉-亚马逊横断面横跨秘鲁和巴西，并比较结果发表的实地测量。在上山区的模型预测缺乏森林植被，表明需要更好的参数化模型内的云雾森林植被的响应。在较低的山区和低地区模拟生态系统的生产力和呼吸预测合理的准确性，虽然并不总是在误差范围内的意见。令人惊讶的是，该样带的模型预测的碳利用效率并没有随着海拔的升高而增加，但仍然接近“温带”值0.5。预计上部山地森林将约50%的碳固定分配给生物量的维持和生长，尽管现有的测量表明它们仅分配约33%。这可能是由于森林冠层内生长和维持呼吸之间平衡的海拔变化，由温度和压力介导的过程控制，这在当前的植被模型中尚未得到很好的体现。
A better understanding of the mechanisms controlling the magnitude and sign of carbon components in tropical forest ecosystems is important for reliable estimation of this important regional component of the global carbon cycle. We used the JULES vegetation model to simulate all components of the carbon balance at six sites along an Andes‐Amazon transect across Peru and Brazil and compared the results to published field measurements. In the upper montane zone the model predicted a lack of forest vegetation, indicating a need for better parameterization of the responses of cloud forest vegetation within the model. In the lower montane and lowland zones simulated ecosystem productivity and respiration were predicted with reasonable accuracy, although not always within the error bounds of the observations. Model‐predicted carbon use efficiency in this transect surprisingly did not increase with elevation, but remained close to the ‘temperate’ value 0.5. Upper montane forests were predicted to allocate ~50% of carbon fixation to biomass maintenance and growth, despite available measurements showing that they only allocate ~33%. This may be explained by elevational changes in the balance between growth and maintenance respiration within the forest canopy, as controlled by both temperature‐ and pressure‐mediated processes, which is not yet well represented in current vegetation models.