This means topsoil contains few of the ingredients needed for long-term successful farming.
这意味着表层土壤几只含有少量长期成功耕作所必需的成分。
Because of this increased concentration, regrowth of plants is minimal, leading to increased erosion, which leads to a decrease in the fertile topsoil, leading to even less regrowth.
由于浓度的增加，植物的再生长很少，导致侵蚀增加，使得肥沃的表层土壤减少，再生长更少。
As it crashed down the steep mountainside like a gigantic snowplough, it swept up trees, boulders and tons of topsoil, and completely crushed and destroyed the six villages that lay in its path.
它像一台巨大的扫雪机一样冲下陡峭的山坡，卷走了树木、巨石和成吨的表土，将沿途的六个村庄彻底摧毁。
Calm and peaceful for most of the year, the Nile used to flood annually, thereby creating, irrigating and carrying new topsoil to the nearby farmland on which ancient Egypt depended for livelihood.
尼罗河虽然在一年的大部分时间里平静而祥和，但是过去每年都会泛滥，从而生成、灌溉并把新的表层土搬运到附近的古埃及人赖以为生的农田。
Calm and peaceful for most of the year, the Nile used to flood annually, thereby creating, irrigating and carrying new topsoil to the nearby farmland, on which ancient Egypt depended for livelihood.
尼罗河在一年的大部分时间里平静而祥和，过去每年都会泛滥，从而创造，灌溉并把新的表土运到附近的农田，古埃及赖以生存。
When it rains hard, landslides sweep topsoil down to the sea.
下大雨的时候，山崩会把表层泥土席卷到海里。
Villagers may be persuaded to build terraces to stop topsoil running off.
村民会被劝说建造更多的梯田好让表层土不被冲刷掉。
And because it washes away rich topsoil, erosion can threaten crop yields.
并且由于丰富的表层土被冲刷掉，土地侵蚀威胁到农作物产量。
Topsoil is a precious resource, and we don't have enough topsoil to replace it.
表层土是非常珍贵的资源，我们不可能找来足够的表层土去覆盖那些受过铅污染的区域。
Topsoil is a precious resource, and we don’t have enough topsoil to replace it.
表层土是非常珍贵的资源，我们不可能找来足够的表层土去覆盖那些受过铅污染的区域。
Without trees, Haiti lost its topsoil through erosion, crippling agriculture.
没有了树木，海地土壤流失，重创了当地农业。
Mud slides and floods are likely, with streams and rivers carrying off the topsoil.
泥石流和洪水很有可能会发生，河流将冲走表层泥土。
Irregular rainfall and loss of topsoil means that the land produces less than before.
无常的降水和表层土壤的流失都使土地逐渐减产。
Under flood conditions, great amounts of topsoil are washed to receiving streams.
在洪水泛滥时，大量表层土壤被冲刷到承受的水流中。
A week later, no smell could be detected as the workers tamped down a final layer of topsoil.
一周以后，当工人将最上层的表层土夯实以后，臭味就消失了。
When the black topsoil was all washed away, farmers moved westward and started new plantations.
当表层黑土全部被冲走之后，农民们就向西部转移，建立新的种植园。
With the tree cover gone, every rainy season sees more of the precious topsoil washed away into the lake.
随着植被覆盖面的消失，每次雨季都将更多的宝贵的表土层冲到湖里去。
The deep, brown topsoil of the North China Plain is planted with wheat, corn, millet, sorghum and cotton.
华北平原大多是褐色土壤，土层深厚，农作物有小麦、玉米、谷子、棉花等。
With crops that rely on phosphorus, he's breeding shallow roots, since phosphorus is typically found in topsoil.
农作物对磷具有依赖性，由于磷一般均分布在土壤的表层，因而使农作物的根扎得浅。
Topsoil is being lost to erosion, and arable land is being lost to desert, to salinization, and to urbanization.
表层土因为侵蚀而正在失去，可耕种的土地正在变成沙漠，被盐化，被城市化。
They built small DAMS made of stones to stem rain run-off and to prevent precious topsoil from being washed away.
他们用石头建起堤坝，以免雨水流失，并防止珍贵的表层土壤被雨水冲走。
Angkor may have suffered problems common to modern times, including deforestation, overpopulation, topsoil degradation and erosion.
吴哥可能已经遭受过和现代相同的问题，包括滥伐森林，人口过剩，表土退化和侵蚀。
Professor Bushberg says removing the topsoil might make the land safe for use. But it depends on the depth of the radioactive material.
布希柏格教授说，移除表层土壤可以保证土地的使用安全，但这取决于放射性物质渗入的深度。
These floods have been very useful because they irrigate the Nile Delta and deposit a rich layer of topsoil used for growing crops.
这些洪水一直非常有用，因为它们灌溉着尼罗河三角洲，沉积下厚厚的一层表土，可以用来种庄稼。
With hoes and axes, they crafted flat, wide terraces and a simple water-management system that would keep valuable topsoil in place.
手拿锄头和斧子，他们精心的建造出自己的平地，梯田，和简单的水处理系统，这样可以保持住最肥沃的表层土不要流失。
In Mingyong, surging meltwater has carried away topsoil; elsewhere, excess runoff has been blamed for more frequent flooding and landslides.
在明永，泛滥的河水冲走了土地的表层土壤，而且还直接导致了山洪和泥石流的频发。
In Mingyong, surging meltwater has carried away topsoil; elsewhere, excess runoff has been blamed for more frequent flooding and landslides.
在明永，泛滥的河水冲走了土地的表层土壤，而且还直接导致了山洪和泥石流的频发。
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