In western North America, most have been replaced by monocultures of fast-growing conifers.
在北美西部，大多数农业活动已被速生针叶树的单一栽培所取代。
They frown on monocultures and chemical fertilisers.
他们不赞成种植单一作物和使用化肥。
But does pollinating monocultures threaten the insects' health?
但给单一作物传播花粉威胁这昆虫的健康吗？
Soy monocultures that focus on a single herbicide, glyphosate, set up the conditions for increased herbicide use.
大豆单一品种集中使用草甘膦一种除草剂，设定了增加除草剂使用的状况。
Local communities believe that monocultures can bring more income. To change this strong belief is the main challenge.
当地人认为单一的竹林会带来更多的收益，改变这种思维是面临的主要挑战。
It replaces the traditional polycultures, required for local self-sufficiency, with monocultures producing crops for export.
它将单一经营的出口农作物生产代替了传统的多元生农业，需要地方的自给自足。
Forest and wildlife ecologists probably can point out additional adverse impacts that such extensive poplar monocultures can generate.
森林和野生生态学家可指出这类大量的单一种植可造成的更多的负面影响。
Forest and wildlife ecologists probably can point out additional adverse impacts that such extensive poplar monocultures can generate.
森林和野生生态学家可指出这类大量的单一种植可造成的更多的负面影响。
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