摘要
对磷在高山禾草─嵩草型草地土壤─植物─绵羊系统（７～１０月）中的循环进行了研究。结果表明，０～６０ｍ深度土壤全磷贮量４４７５．３～４７９９．８ｋｇ／ｈｍ２（ＣＶ＝３．０９％），速效磷贮量８６．５～１２３．９ｋｇ／ｈｍ２（ＣＶ＝１３．９６％）。磷在土壤─植物转化阶转化率最大值仅０．１２３５％，磷在植物─绵羊各转化阶的转化率均以１０月为分界点，１０月以后锐减。７～９月土壤库磷处于消耗状态，绵羊库磷处于积累状态。从１０月开始，土壤库磷处于积累状态，绵羊库磷处于消耗状态。磷在土壤库、植物库和绵羊库之间的分布极不平衡，土壤库占９９．８６％～９９．９３％，植物库占０．０６４２２％～０．１２８２％，而绵羊库仅占０．００７２２５％～０．０１３６３％。
In this paper,P in the soil-plant-sheep system of grass-kobrsia Alpine Grassland were studied.Theresults showed that the totaI P content in 0─60cm soil varied from 4475.3kg/hm2 to 4799. 8kg/hm2(CV=3.09%)and the available P varied from 86.5kg/hm2 to 123.9kg/hm2(CV = 13.96%).The conversionrate(CR)of P from soil to plant was rather low with the maximum of 0.1235%. The turning point CR ofP from plant to animal at different transforming stages occured in October,thereafter it decreasedsignificantly. From J uly to September the soil pool was decreasing,the animal pool was increasing.AfterOctober the soil pool was increasing and the animal pool was decreasing.The distribution of P in the threepoois of soil,plant and animal were greatly different,soil pool took about 99.86%～99.93%, plant pooltook 0.06422%～0.1282%,whereas animal pool only took 0.007225%～0.01363%.
出处
《草业学报》
CSCD
1995年第2期75-80,F003,36,共8页
Acta Prataculturae Sinica
基金
国家自然科学基金
关键词
高山草地
磷
磷转化率
磷循环
高山禾草
alpine grasstand,phoshphor us,conversion rate of P,P cycling
