这个湖几乎填满了泥沙和植被。
许多山坡都是植被稀疏的岩石地。
我们在茂密的植被中开出一条通路。
自从引进山羊之后，这个岛上的植被模式改变了。
Vegetation patterns changed when goats were introduced to the island.
他们只是在做为防止植被遭大规模破坏而必须做的事情。
They are only doing what is necessary to prevent wholesale destruction of vegetation.
苔原是平坦的土地，植被稀少。
这些动物吃掉了大量的植被。
气温升高会导致植被生长速度加快，对吗？
Warmer temperatures should lead to increased vegetation growth, right?
我们看不到那么多种类的植被、树木和草等等。
We don't see as many types of vegetation, trees, grasses and so forth.
随着北美、欧洲和亚洲植被的急剧变化，沙漠遍布世界各地。
Deserts spread throughout the world as vegetation shifted drastically in North America, Europe and Asia.
这些动物食用了大量的植被，因此减少了这个公园的植物多样性。
These animals consumed large amounts of vegetation, which reduced plant diversity in the park.
在一个地区过度放牧的后果是植被覆盖的减少和对土壤的践踏和粉碎。
The consequences of an excessive number of livestock grazing in an area are the reduction of the vegetation cover and the trampling and pulverization of the soil.
森林里的日光质量随着植被密度、太阳照射角度和天空云层数量变化而变化。
The daytime quality of light in forests varies with the density of the vegetation, the angle of the Sun, and the amount of cloud in the sky.
一个特定地区的植被类型是通过识别和计算那里发现的各种花粉粒来确定的。
The type of vegetation in a specific region is determined by identifying and counting the various pollen grains found there.
其实，澳大利亚已经干燥一百多年了，巨型金枪鱼所面临的大陆植被开始消失。
Indeed, Australia has been drying out for over a million years, and the megatauna were faced with a continent where vegetation began to disappear.
更少的植被意味着土壤也无法保持水分；下雨时土壤就失去了保持水分的能力。
Less vegetation means the soil can't hold water as well; the soil loses its ability to retain water when it does rain.
如今，除了受到高栅栏保护的公园和灌木丛之外，这个小镇上已经没有一点植被。
The town has been browsed bare of vegetation, except where gardens and shrubs are protected by high fences.
作为一个强有力的竞争者，蕨类植物排挤了其他植被，从而降低了放牧地的价值。
A tough competitor, bracken reduces the value of grazing land by crowding out other vegetation.
在农村，材料的热容量要低得多，因为植被可以防止热量轻易地从地面流入或流出。
In the countryside materials have a significantly lower heat capacity because a vegetative blanket prevents heat from easily flowing into and out of the ground.
即使在保留土壤覆盖的地区，植被的减少通常也会导致土壤丧失吸收大量水分的能力。
Even in the areas that retain a soil cover, the reduction of vegetation typically results in the loss of the soil's ability to absorb substantial quantities of water.
在半干旱地区，草地通常是最主要的天然植被，而该地区主要的经济活动是家畜饲养。
The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.
然后这个循环继续下去，雨水减少，土壤变干，植被减少，云层减少，雨水再减少等等。
Then the cycle continues, less rain, drier soil, less vegetation, fewer clouds, less rain etc.
刀耕火种的耕作方式对土壤是有好处的，只要它不完全烧掉所有的植被，只留下烧焦的木头。
Slash-and-burn farming can be good for soils provided it doesn't completely burn all the vegetation, and leaves behind charred wood.
亚洲西南部的气候变化更为微妙，因为它们涉及到山地雪线、降雨模式和植被覆盖率的变化。
The climatic changes in southwestern Asia were more subtle, in that they involved shifts in mountain snow lines, rainfall patterns, and vegetation cover.
起到稳定作用的自然植被不断减少，随后土壤受风雨的侵蚀加速，就成为了沙漠化的主要成因。
Desertification is accomplished primarily through the loss of stabilizing natural vegetation and the subsequent accelerated erosion of the soil by wind and water.
这种有袋类动物生活在澳大利亚中部的沙漠中，那里的降雨和植被的突然生长是极其不可预测的。
This marsupial inhabits the deserts of central Australia where the onset of rains and the resulting sudden growth of vegetation are extremely unpredictable.
后来的物种都依赖于早期物种的准备工作，因为斑马的行动改变了植被，以适应角马、黄羊和瞪羚的胃。
The later species all depend on the preparations of the earlier one, for the actions of the zebra alter the vegetation to suit the stomachs of the wildebeest, topi, and gazelle.
例如，圣地亚哥的市政法规要求业主保持景观和植被的标准，否则将面临相当于雇佣私人承包商的罚款。
San Diego's municipal code, for instance, requires property owners to maintain landscape and vegetation standards—or face a penalty equivalent to the cost of hiring a private contractor to do so.
土壤吸收水分的能力减弱使土壤逐渐变得干燥，导致植被进一步减少，从而建立了一个渐进的地表退化循环。
The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation, so that a cycle of progressive surface deterioration is established.
一旦腐殖质层消失，养分就无法从土壤中回收和过滤，致使土壤由肥沃变为贫瘠，只适于热带草原植被的生长。
Once the humus layer disappears, nutrients cannot be recycled and leach from the soil, converting soil from fertile to infertile and making it suitable only for savanna vegetation.
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