That builds topsoil and prevents flooding.

这会形成表土，防止洪水。

Bacteria are key players in the formation of topsoil.

细菌是表层土壤的重要组成部。

Finally, add a layer of compost and a layer of topsoil in equal amounts.

最后，添加一层堆肥和一层等量的表层土。

When humans started draining the natural topsoil, and ploughing it up for planting, they exposed the buried carbon to oxygen.

当人类耗尽自然表层土并开始为了耕种而犁田时，他们就把土壤中掩藏的碳质暴露在了氧气中。

And finally, in 2016, a layer of rock and topsoil was laid down, finishing the restoration.

最后，在 2016 年，湖床铺上了一层岩石和表土，修复工作最终完成。

So, you're seeing at the topsoil, you have the water table, the different layers underneath the ground.

大家可以看到表土层，下水位，还有下不同的层。

We know we have only scratched the topsoil of this complex and important economic sector.

我们知道，我们只是触及了这个复杂而重要的经济部门的表层土壤。

Then it's important to aerate the topsoil and leave it loosely packed on the surface.

然后重要的是给表土充气并使其松散堆积在表面上。

So, the landfill changed its routine, keeping the topsoil in place until just before the trash is dumped, greatly reducing methane emissions.

那么，这个垃圾填埋场一改常规，垃圾倾倒之前，不进行表土剥离，这种做法大大减少了甲烷的排放。

The authors note widespread erosion of topsoil, forest felling, acidifying oceans, extreme weather, plastic in the seas, overfishing and more.

告指出的问题包括表层土壤的侵蚀、森林砍伐、海洋酸化、极端天气、海洋的塑料污染、过度捕鱼以及更多问题。

Landscapes were already degraded, rivers were silted with precious topsoil.

景观已经退化，河流被珍贵的表土淤积。

The new landowners are not planning to import new topsoil to make their African acquisitions more arable.

新的土所有者不打算进口新的表土来使他们在非洲收购的土壤更可耕种。

They eat close to the roots, preventing plants from regrowing; their sharp hooves damage topsoil.

它们靠近根部进食，阻止植物重新生长；它们锋利的蹄子会破坏表土。

While arid regions may get the same amount of rain, it now comes in torrents, washing away the topsoil.

虽然干旱区可能会有同样多的雨水，但现在雨水倾盆而下， 冲走了表土。

Below the A horizon are layers of basically all the extras from the topsoil.

A 层以下是表土层基本上 所有的附加物。

It ignores the depletion of resources like groundwater and topsoil and the web of living species.

它忽略了下水和表土以及生物物种网络等资源的枯竭。

You could almost see them drawing out carbon dioxide and pumping out oxygen, holding on to precious topsoil.

你几乎可以看到它们吸收二氧化碳并泵出氧气，保留着宝贵的表土。

As settlers cleared land to create the great farms of the American Midwest, more and more valuable topsoil eroded into the Mississippi.

随着定居者开垦土，建造美国中西部的大农场，越来越多宝贵的表土被侵蚀成密西西比河。

However, ploughing is blamed for causing severe damage to topsoil by removing the plants that protect soil from being blown or washed away.

但是，犁田被认为是造成表层土严重受损的罪魁祸首，因为它把保护土壤不被吹散或冲走的植物清除了。

However, ploughing is blamed for causing severe damage to topsoil by removing the plants that protect the soil from being blown or washed away.

然而，犁是使表层土遭受严重破坏的罪魁祸首。它铲除了免于土壤遭风吹或冲刷的植物。