Gallet Sebastien, Lemauviel Servane, Roze Françoise
Université de Rennes, 1 UMR 6553, Dynamiques des Communautés, Campus de Beaulieu, 35042, Rennes cedex, France.
Environ Manage. 2004 Jun;33(6):821-9. doi: 10.1007/s00267-004-0017-x.
In the last few decades, trampling has become a cause of major disturbance to natural areas. Trampling can occur regularly either seasonally or throughout the year, or as a single impact depending on a recreational activity or an event. This study, carried out on a coastal heathland in north Brittany (France), was based on the hypothesis that the vegetation response can differ depending on whether the trampling is repeated or due to a single event. The aim was to compare the resistance and the short-term recovery capacity of selected species in coastal heathland communities subjected to a trampling experiment, applied once or five times (with equal total number of passes from 0 to 800). The temporal distribution of the trampling did not affect the response of Erica ciliaris, whereas for Erica cinerea and Ulex gallii, trampling was slightly less damaging when applied once rather than five times. These differences could be linked to the lower resistance and the higher recovery capacity of E. ciliaris, compared with the two other species. This study also emphasized the influence of site location by comparing observations with previous studies. Plant resistance calculated here appeared to be lower than that calculated for a less stressful site. The relationship between plant traits and response to trampling was also investigated. The effects of the different times between disturbance application and observations of the short-term response of woody vegetation to experimental trampling is also discussed.
在过去几十年里，践踏已成为自然区域受到严重干扰的一个原因。践踏可能会根据季节性或全年定期发生，或者取决于一项娱乐活动或一个事件而产生单次影响。本研究在法国布列塔尼北部的一片沿海石南荒原上开展，其基于这样一个假设：根据践踏是反复发生还是由单次事件导致，植被的反应可能会有所不同。目的是比较在进行了一次或五次践踏实验（总通行次数从0到800次相等）的沿海石南荒原群落中，选定物种的抗性和短期恢复能力。践踏的时间分布并未影响睫毛石南的反应，而对于灰毛石南和刺叶金雀花来说，单次践踏造成的损害略小于五次践踏。与其他两个物种相比，这些差异可能与睫毛石南较低的抗性和较高的恢复能力有关。本研究还通过将观察结果与先前研究进行比较，强调了地点的影响。此处计算得出的植物抗性似乎低于在压力较小的地点计算得出的抗性。还研究了植物特征与对践踏反应之间的关系。此外，还讨论了在干扰施加与观察木本植被对实验性践踏的短期反应之间的不同时间间隔的影响。
