【摘要】 比较研究了羊草草原连续自由放牧 19年和围栏禁牧对暗栗钙士磷的贮量和形态的影响。结果表明 ,与未放牧草地相比 ,放牧草地土壤 0～ 6 0cm碳、磷贮量分别损失了 2 4 .l%和 2 4 .9% ;0～ 10 0cm碳、磷贮量损失了 2 3%和 2 1%。磷的损失主要是有机磷。放牧使土壤中铁磷占全磷的比例明显下降 ;钙磷占全磷的比例稍有提高 ,但各土层的数值比较 ,围栏内外均未达到显著差异。更多还原

【Abstract】 Effects of 19 year grazing on phosphorous stock and forms in chestnut soil of Leymus chinensis steppe were investigated. The results indicated that soil carbon and phosphorus stocks in 0～60 cm at grazing sites lost 24.1% and 24.9% respetively compared with ungrazing sites. In 0～100 cm soil depth, carbon and phosphorus stocks lost 23% and 21%, respectively. The main composition of the loss of P is organic form. The proportion of Fe P form decreased significantly in grazing sites. The proportion of Ca P had the decreasing trend.更多还原