事实上这两个系统都不该拥有这么多物种，它们的土壤中极度缺氮和缺磷，这是植物生长所需的营养盐。

In fact, both ecosystems owe their enormous diversity, in part. to the fact that their soils have critically low supplies of nitrogen and especially phosphorus, nutrients plants need in order to grow.

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运用垂直平均值的浮游生物模型研究了在一个固定站和扩展湾流体系中，浮游植物、浮游动物和营养盐的季节变化。

The seasonal variation of phytoplankton zooplankton and nutrients at a fixed station and in the extended Gulf Stream system are studied by using a vertically averaged plankton model respectively.

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另一方面，贫瘠的土壤无法为快速生长的植物提供足够的营养盐 因为它们无法建立巨大的地下根系夺取资源。

On the other hand, poor soils don't provide enough nutrient capital for fast growing plants to build their massive infrastructures and take all the resources.

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