The herbicide might damage populations of certain rare plant species that the lake contains.

除草剂可能会破坏湖泊中某些稀有植物的种群。

Many areas were richer in animal and plant species than they are now, making them highly favorable for human occupation.

许多地区的动植物种类曾比现在丰富，使得它们非常适合人类居住。

A real and pressing issue is that many plant species have not yet been cataloged, and so their place in the ecosystem is unknown.

一个现实而紧迫的问题是，许多植物物种还没有被编目，因此它们在生态系统中的位置是未知的。

Certain plant species won't flower if they sense too much light and some plants will only flower if they sense a specific amount of light.

某些植物种类如果感觉到了太多光就不开花，而有些只有感觉到了一定程度的光才会开花。

Many savanna and dry-forest plant species are called pyrophytes, meaning they are adapted in various ways to withstand occasional burning.

许多热带稀树草原和干森林植物物种被称为火生植物，这意味着它们以各种方式形成适应性，以抵御偶尔的燃烧。

Plant species dependent solely on seeds for survival or dispersal are obviously more vulnerable to any decrease in plant fecundity that occurs.

显然，仅依靠种子生存或传播的植物物种更容易受到植物繁殖力下降的影响。

When burning occurs, it prevents competition among plant species from progressing to the point where some species exclude others, reducing the overall diversity of the ecosystem.

当发生燃烧时，它阻止了植物物种之间的竞争发展到某些物种排斥其他物种的程度，减少了生态系统的整体多样性。

As a result of these diverse methods by which plants supply resources, unique soil communities form under different plant species and under plant communities that differ in composition.

由于植物提供资源的方法不同，在不同的植物种类和组成不同的植物群落下形成了独特的土壤群落。

The question of whether the decrease in plant fecundity caused by the spraying of pesticides actually causes a decline in the overall population of flowering plant species still remains unanswered.

喷洒杀虫剂导致的植物繁殖力下降是否真的会导致开花植物物种总数的下降，这个问题仍然没有答案。

If a nonnative plant species invades an above-ground community of flora and fauna, it can alter links between the native above-ground community and the below-ground soil community.

如果一种外来植物入侵了地上的动植物群落，就会改变地上群落和地下土壤群落之间的联系。

Perhaps we should give special attention to the conservation of such plant species since they lack key factors in their defenses against the environmental disruption caused by pesticide use.

也许我们应该特别注意保护这类植物，因为它们缺乏关键的因素来抵御由使用杀虫剂而造成的环境破坏。

Nearly a quarter of plant species are threatened with extinction.

近四分之一的植物物种有灭绝的危险。

The plants are one of over 300 plant species endemic to the island.

这种植物就是岛上300多种特有物种中的一种。

Althoughsome plant species disappeared, many more new species arose.

尽管有些物种消失，但是又有许多新物种产生。

Some plant species, such as the Lima bean, secrete a nectar that ants find delicious.

一些植物种类，如利马豆，分泌一种蚂蚁感到美味的花蜜。

"Both plant species and the watershed are threatened by deforestation," Espaldon warns.

“植物种类和分水岭都受到森林砍伐的威胁，”Espaldon警告说。

Those plant species are also themost likely to develop broader defenses against predators.

而这些植物种类也是最有可能进化为最具抵抗能力的物种。

Before agriculture, humans were living on diets that included more than 150 plant species.

在农业出现以前，人类赖以为生的食物包括150多种植物。

The mass extinction event killed off the dinosaurs and many other animal and plant species.

中找到了元素铱岩层，而这通常会被发现于小行星中。 这次灭绝事件杀光了恐龙以及许多其他动植物物种。

We know that probably at least 10 per cent of plant species were formed by some kind of hybridisation.

我们知道，大体上至少有10%的植物品种是通过杂交而形成的。

And humans are not the only ones at risk: all manner of other animal and plant species could be affected.

并且人类并不是唯一受到威胁的动物，其它各种动物和植物都会受到影响。

Soil salinity is a serious.Therefore, Salt Tolerance Plant species selection and select local native plant species.

因为土壤盐碱很严重，因此，植物选择耐盐碱品种及选择乡土树种。

For example, around 1,200 of its 10,000 plant species are endemic to the country, and are found only in Turkey.

例如，在该国10,000种植物物种中，当地物种大约为1,200，并且只出现在土耳其。

More than 2, 500 invasive plant species have colonised Australia and New Zealand, competing for sunlight and nutrients.

超过2,500个外来植物物种已经植根于澳大利亚和新西兰，争夺阳光和养分。

The colourful wildlife found in tropical humid forests makes up more than half of the animal and plant species on Earth.

湿热的热带丛林里丰富多彩的野生生物构成了整个地球动植物种类的一半还要多。

The vertical garden at the Athenaeum, which is eight stories tall, has 260 plant species and more than 12,000 plants.

雅典娜宾馆的立体花园，八层楼高，种了260个类属的12,000种植物。