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本试验在不放牧利用的条件下,对豆禾草地和禾草草地土壤中的铵和硝酸盐的积累的季节性分配进行了评价。两年期间,对土壤表层20cm内氮积累的两种形式进行了观察。试验结果表明,上述草地的植物生长活动使土壤中硝酸盐的积累量很少,在夏季使其积累量增大则靠调节牧草种类和豆科牧草的比例。夏天土壤中铵的积累也有所增加,但其积累量的多少不受牧草种类或豆科牧草比例的影响。
This experiment evaluated the seasonal distribution of ammonium and nitrate accumulation in soils of gramineous and grassy soils without grazing. During the two years, two forms of nitrogen accumulation within 20 cm of the soil surface were observed. The results showed that the above-mentioned plant growth activities in the grassland caused little accumulation of nitrate in the soil and increased the accumulation in the summer by adjusting the proportion of forage species and leguminous pasture. The accumulation of ammonium in the soil in summer also increased, but the amount of accumulation was not affected by the proportion of forage or legumes.