代写论文:灌木丛中发生的变化

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05/01/2018

代写论文:灌木丛中发生的变化

这项研究的主要目的是评估自过去30年以来在灌木丛中发生的变化。这是一个驯鹿大量增加和减少的地区,而年平均气温上升了3摄氏度。 1972年到2010年间,灌木丛的惰性与努纳维克中部地区的灌木覆盖率显着增加形成鲜明对比。研究中提供的数据不允许在扩张灌木的缺乏和跨越Riviere-aux-Feuilles牧群的浏览压力之间存在直接联系(Plante等,2014)。然而,从1975年到2001年,人口密度高的驯鹿密度可能解释了研究地点灌木物种对气候变化的惰性。这是对过去的研究发现,在驯鹿繁重的浏览过程中,灌木覆盖度可能会减少,或者灌木和生物量的增长最终以明显的方式增加,其中排除了驯鹿。此外,由于灌木在草本北极苔原的景观层面上似乎很稀疏,所以浏览驯鹿的关键在于一些灌木丛的可用性。这提供了驯鹿能够控制稀疏植被景观内的灌木扩张物种(Plante等,2014)。事实上,不管从2001年到2011年的牧群数量下降,2011年70%的灌木仍然少于50%的浏览枝条。关键的观察结果是灌木在更接近树线的亚北极地区,温暖的空气温度以及不连续的永冻土地区内。

代写论文:灌木丛中发生的变化

The key purpose of the research was on evaluating changes taking place across shrub cover since the last 30 year. This is an area in which a large population of caribou increased and decreased, while there was an increase in the mean yearly temperature by 3 degrees Celsius. The inertia between 1972 and 2010 of shrub cover has been contrasting with the observable increment in shrub cover all across the central region of Nunavik. The data presented in the research does not permit a direct link between the lacks of expanded shrub and the pressure of browsing across the herd of Riviere-aux-Feuilles (Plante et al., 2014). However, high density of caribou in association with the demographically growing population from the year 1975 to the year 2001 may explain the inertia delivered by shrub species across change in climate at the research site. This is with respect to the past research discovering that there can be a reduction in shrub cover under heavy browsing of caribou, or the growth in shrub and biomass ended up increasing in a significant manner in which there is exclusion of caribou. In addition, as shrubs appear to be sparse at the level of landscape across the herbaceous arctic tundra, browsing of caribou has key concentration on the availability of some shrub patches. This provides that caribou is able of controlling the expanded species of shrub within landscapes of sparse vegetation (Plante et al., 2014). As a matter of fact, irrespective of the declining herd from the year 2001 to the year 2011, 70 per cent of the shrubs still have less than 50 per cent of the browsed shoots in the year 2011. There has been a key observation of shrub expansion in subarctic regions within closer proximity to tree line, with warm temperatures of air and within the discontinuous permafrost region.

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