Behind the scene of arctic-alpine greening – implementing a multi-parameter approach to disentangle the controls of spatio-temporal variation in dwarf-shrub growth

北极高山绿化的幕后——实施多参数方法来理清矮灌木生长时空变化的控制

• 批准号: 426704576
• 负责人: Professor Dr. Jörg Löffler, since 1/2020
• 金额: --
• 依托单位: Geographisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/426704576?language=en
• 关键词: Behind; scene; arctic; alpine; greening

The observed, mainly dwarf-shrub induced, greening of arctic-alpine regions is likely to cause impacts at local to global scales. Facing this importance, it is inevitable to get knowledge about the underlying drivers of the current patterns of both primary production and phytomass. Consequently, recent studies focus at the mechanisms behind the increase of phytomass and the expansion of dwarf shrubs. They are, however, often based on remote-sensing studies of entire biomes or regions at comparably coarse scales. Obviously, such studies can neither account for the fine-scaled heterogeneity of especially alpine regions, nor for the actual growth response of dwarf shrubs that is triggered by ecophysiology. As such, approaches that account for the fine-scaled heterogeneity of arctic-alpine regions while studying the growth response of dwarf shrubs are lacking. Thus, the presented research project aims at a spatio-temporally fine-scaled ecological interpretation of the growth dynamics of the woody vegetation, which will be conducted along micro-topographical and altitudinal gradients in the alpine region of central Norway. We will follow a multi-parameter approach to disentangle the driving forces of shrub growth that, for the first time, also includes a systematic recording of the growth dynamics of characteristic dwarf-shrub species at a high temporal resolution based on dendrometers. This offers the opportunity to bridge the gap within the causal chain of cell division and cell enlargement, both of which are ecophysiologically triggered by short-term events, and the annual ring width that integrates over the entire growing season.

观察到的主要是矮灌木引起的北极高山地区的绿化可能会在局部到全球范围内造成影响。面对这一重要性，了解当前初级生产和植物量模式的潜在驱动因素是不可避免的。因此，最近的研究集中在植物生物量增加和矮生灌木扩张背后的机制。然而，它们往往是基于对整个生物群落或区域进行的相对粗略的遥感研究。显然，这样的研究既不能解释特别是高山地区的细微尺度的异质性，也不能解释由生态生理触发的矮小灌木的实际生长反应。因此，在研究矮灌木的生长反应时，缺乏解释北极高山地区细微尺度的异质性的方法。因此，本研究项目旨在对木本植被的生长动态进行时空精细的生态学解释，该解释将沿着挪威中部高山地区的微地形和海拔梯度进行。我们将采用多参数方法来解开灌木生长的驱动力，其中还首次包括基于树状图以高时间分辨率系统地记录特征矮灌木物种的生长动态。这提供了在细胞分裂和细胞扩大的因果链条中弥合差距的机会，这两者都是由短期事件在生态生理上触发的，以及在整个生长季节整合的年度年轮宽度。