Burning the forest just once can leave behind enough black carbon to keep the soil fertile for thousands of years.

森林仅仅燃烧一次就能留下足够的黑碳，来保持数千年土壤肥沃。

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Land use change is still a major source of carbon dynamics emission due to burning and cultivation, which caused to decline soil organic carbon contents in soils and degrade soil quality.

因烧垦而引起的土地利用变化仍然是碳素释放的主要来源，从而导致了土壤有机碳含量下降和土壤质量退化。

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The results show that the great differences between the soil fertility of control burning and that of non-burning are resulted by the different ground clearances.

结果表明：采伐迹地的不同清理方式导致了林地肥力的较大差异。

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Fertilized soil and the burning of crop waste also release harmful gases into the air.

VOA: special.2010.01.05

The problem is that while clear-cutting sections of rain forest and burning out all the underbrush makes great soil for pastureland, it only does so for about three years.

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