...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global and planetary change >Pre-industrial-potential and Last Glacial Maximum global vegetation simulated with a coupled climate-biosphere model: Diagnosis of bioclimatic relationships
【24h】

Pre-industrial-potential and Last Glacial Maximum global vegetation simulated with a coupled climate-biosphere model: Diagnosis of bioclimatic relationships

机译：工业前潜势和最后冰川期用耦合的气候-生物圈模型模拟的全球最大植被：生物气候关系的诊断

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The global climate-vegetation model HadSM3_TRIFFID has been used to estimate the equilibrium states of climate and vegetation with pre-industrial and last glacial boundary conditions. The present study focuses on the evaluation of the terrestrial biosphere component (TRIFFID) and its response to changes in climate and CO_2 concentration. We also show how, by means of a diagnosis of the distribution of plant functional types according to climate parameters (soil temperature, winter temperature, growing-degree days, precipitation), it is possible to get better insights into the strengths and weaknesses of the biosphere model by reference to field knowledge of ecosystems. The model exhibits profound changes between the vegetation distribution at the Last Glacial Maximum and today that are generally consistent with palaeoclimate data, such as the disappearance of the Siberian boreal forest (taiga), an increase in shrub cover in Europe and an increase of the subtropical desert area. The effective equatorial and sub-tropical tree area is reduced by 18%. There is also an increase in cover of wooded species in North-Western Africa and in Mexico. The analysis of bioclimatic relationships turns out to be an efficient method to infer the contributions of different climatic factors to vegetation changes, both at high latitudes, where the position of the boreal treeline appears in this model to be more directly constrained by the water stress than by summer temperature, and in semi-humid areas where the contributions of temperature and precipitation changes may partly compensate each other. Our study also confirms the major contribution of the decrease in CO_2 to environmental changes and carbon storage through its selective impact on gross primary productivity of C3 and C4 plants and a reduction by 25% of water-use efficiency. Specifically, the reduction in CO_2 concentration increases the amount of precipitation necessary to sustain at least 20% of grass fraction by 50 mm/year; the corresponding threshold for trees is increased by about 150 mm/year. As a consequence, a reduction in CO_2 concentration considerably widens the climatic range where grasses and shrubs dominate.
机译：全球气候-植被模型HadSM3_TRIFFID已被用来估算工业化前和最后冰川边界条件下的气候和植被平衡状态。本研究的重点是评估陆地生物圈成分（TRIFFID）及其对气候和CO_2浓度变化的响应。我们还展示了如何通过根据气候参数（土壤温度，冬季温度，生长度天数，降水量）诊断植物功能类型的分布，从而有可能更好地了解植物的优势和劣势。生物圈模型参考生态系统的实地知识。该模型显示出末次冰期最大值和今天植被分布之间的深刻变化，通常与古气候数据一致，例如西伯利亚寒带森林的消失（taiga），欧洲的灌木覆盖增加和亚热带的增加沙漠地区。有效的赤道和亚热带树木面积减少了18％。西北非洲和墨西哥的树木种类也有所增加。生物气候关系分析被证明是一种推断高海拔地区不同气候因素对植被变化的贡献的有效方法，在该模型中，北方树线的位置在该模型中似乎比水分胁迫更直接地受到约束。受夏季温度影响，以及在半湿润地区，温度和降水变化的影响可能会部分相互抵消。我们的研究还证实了CO_2的减少对环境变化和碳储存的主要贡献，这是通过选择性影响C3和C4植物的总初级生产力以及减少25％的用水效率而实现的。具体而言，CO_2浓度的降低使维持至少20％的草分所必需的降水量增加了50 mm /年；树木的相应阈值每年增加约150毫米。结果，CO 2浓度的降低大大拓宽了以草和灌木为主的气候范围。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号