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The importance of age-related decline in forest NPP for modeling regional carbon balances

机译：与森林NPP年龄相关的下降对于模拟区域碳平衡的重要性

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摘要

We show the implications of the commonly observed age-related decline in aboveground productivity of forests, and hence forest age structure, on the carbon dynamics of European forests in response to historical changes in environmental conditions. Size-dependent carbon allocation in trees to counteract increasing hydraulic resistance with, tree height has been hypothesized to be responsible for this decline. Incorporated into a global terrestrial biosphere model (the Lund-Potsdam-Jena model, LPJ), this hypothesis improves the simulated increase in biomass with stand age. Application of the advanced model including a generic representation of forest management in even-aged stands, for 77 European provinces shows that model-based estimates of biomass development with age compare favorably with inventory-based estimates for different tree species. Model estimates of biomass densities-on province and country levels, and trends in growth increment along an annual mean temperature gradient are in broad agreement with inventory data. However, the level of agreement between modeled and inventory-based estimates varies markedly between countries and provinces. The model is able to reproduce the present-day age structure of forests and the ratio of biomass removals to increment on a European scale based on observed changes in climate, atmospheric CO2 concentration, forest area, and wood demand between 1948 and 2000. Vegetation in European forests is modeled to sequester carbon at a rate of 100 Tg C/yr, which corresponds well to forest inventory-based estimates.
机译：我们显示了通常观察到的与年龄相关的森林地上生产力的下降，以及由此而来的森林年龄结构，对欧洲森林响应环境条件的历史变化的碳动态的影响。树木中依赖于大小的碳分配以抵消水力阻力的增加，据推测树木高度是造成这种下降的原因。纳入全球陆地生物圈模型（Lund-Potsdam-Jena模型，LPJ）后，该假说改善了模拟生物量随树龄的增加。在欧洲77个省份中，该先进模型的应用包括对普通林分中森林管理的一般表示，结果表明，基于模型的生物量随年龄增长的估算值与基于清单的不同树种估算值相比具有优势。关于省和国家/地区水平的生物量密度的模型估计以及沿年平均温度梯度的增长增量趋势与库存数据大致一致。但是，模型估算和基于清单的估算之间的一致性水平在国家和省之间差异很大。该模型能够根据1948年至2000年间观测到的气候，大气CO2浓度，森林面积和木材需求的变化，再现当今森林的年龄结构以及生物量清除的比例在欧洲范围内增加。以欧洲森林为模型，其固碳速度为每年100 Tg C，这与基于森林清单的估算非常吻合。

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