The effect of Melilotus officinalia on improving degraded soil is studied according to the change in nutrient content of soil after planting.

通过对人工种植黄花草木樨样地的监测，根据土壤养分含量的变化研究了改良退化土壤的效果。

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The research content included the slope-directive variation of soil bio-accumulations properties and related nutrient status, base cation leaching, the quantity of microorganism etc.

研究内容主要包括土壤生物积累及相关养分状况、盐基淋溶作用和微生物数量等方面的坡向性分异，并探讨其对山地土壤资源开发利用和生态环境建设的意义。

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The content of quick effective nutrient of soil is formed by applying fertilizer for years.

土壤速效养分含量是多年培肥土壤形成的，不属当年施肥。

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Dr Bowden and his colleagues also hope to understand the impact of thermokarst activity on the structure of the soil, and its nutrient content.

ECONOMIST: Global warming and the permafrost