放牧对暗栗钙土磷的贮量和形态的影响  

Effects of grazing on phosphorus stock and forms in chestnut soil

作　　者：李香真[1] 

机构地区：[1]中国科学院植物研究所,北京100093

出　　处：《草业学报》2001年第2期28-32,共5页Acta Prataculturae Sinica

基　　金：中国科学院内蒙古草原生态系统定位站开放基金资助

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。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.

关 键 词：羊草草原 放牧 磷 形态 贮量 暗栗钙土 

分 类 号：S812.2[农业科学—草业科学]