主題:第一銀行102年新進行員甄選試題-理財組


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森林火災可能是有益的樹木,土壤和動物。首先,樹木是主要的受益者。許多自然發生的森林火災,往往由雷擊引起的,表面火災,燃燒不損壞樹木林冠林下 - 從森林 - 灌木和草本植物。火以這種方式,消除了競爭的小的樹允許較大的樹木蓬勃發展。一旦林下已燒掉,森林是不太可能從高溫火災燃燒 - 合併冠,表面上看,和地面火災,高大的樹木,可以做到真正的損害。伯恩斯也有自然形成的樹病蟲害控制。 此外,森林火災,可以把“垃圾” - 在森林地面上的枯葉,樹枝和樹枝 - 營養豐富的土壤,改善土壤質量。通常情況下,枯枝落葉分解非常緩慢。然而,火災釋放的營養物質立即在墊料。這將創建一個增加量的磷,鉀,其中的關鍵要素,促進樹增長。由此產生的的肥沃土壤鼓勵種子生長。 此外,森林火災能出“森林”薄所以較大的動物可以生活在森林裡。動物,如鹿和駝鹿,這就需要一些開放的生存空間,有利於從林下變薄。由於豐富的土壤,讓新的草本和灌木生長,這些動物是新的食物。   ************************************************************************** Forest fires can be beneficial for trees, soil, and animals. First, trees are the major beneficiaries. Many naturally occurring forest fires, often caused by lightning strikes, are surface fires that burn the understory – the shrubs and herbs from the forest – without damaging the trees in the overstory. In this way, the fire eliminates competition from the smaller trees, allowing the larger trees to flourish. Once the understory has been burned away, the forest is less likely to burn from high-temperature fires – the combined crown, surface, and ground fires that can do real damage to the tall trees. Burns are also a natural form of control for tree disease and insect pests. Furthermore, forest fires can improve soil quality by converting the “litter” – dead leaves, twigs, and branches on the forest floor – to nutrient-rich soil. Normally, litter decomposes very slowly. However, fire releases the nutrients in the litter immediately. This creates an increase in the amount of phosphorus and potassium which are key elements that promote tree growth. The resulting rich soil encourages seed growth. Additionally, forest fires can ‘thin out’ the forest so larger animals can live in the forest. Animals like deer and moose, which need some open space to live, benefit from the thinning of the understory. As the enriched soil allows new herbs and shrubs to grow, there is new food for these animals as well.

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