覆盖在森林地表的一层薄土很容易被冲走。
The thin soil that covers the forest floor can be easily washed away.
酸雨对森林地表层的土壤来说，它改变了原来的pH值'。
When acid rain falls on forest floors, it changes the ingredients - the 'PH level' - of the soil.
当木蚁死亡时，寄生菌从其上破头而出，伸出孢子囊，孢子会在晚上播撒到森林地表。
Once an ant has died, the fungus sprouts from its head and produces a pod of spores, which are dropped at night on to the forest floor.
在这个自然生长的地方，不断伸展的树枝架在上面截断了阳光，阻碍了森林地表植物的生长。
In their natural state, the spreading branches overhead shut out sunlight and prevent the growth of plants on the forest floor.
该文通过对森林火蔓延模型的研究，建立了一种使用产生式原则的多模型森林地表火蔓延预测系统。
Through the study on the model of forecasting forest fire spreading, this research built a multi-model predicting system based on the production rule.
应用自行研制的“多坡段固相材料火蔓延实验台”，模拟森林地表火的蔓延过程，对变坡度情况下森林地表上坡火行为规律进行了实验研究。
In this paper, a solid phase material fire experimental bed, which has more slope segments, has been used to simulate upslope forest surface fire.
应用自行研制的“多坡段固相材料火蔓延实验台”，模拟森林地表火的蔓延过程，对变坡度情况下森林地表上坡火行为规律进行了实验研究。
In this paper, a solid phase material fire experimental bed, which has more slope segments, has been used to simulate upslope forest surface fire.
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