【摘要】 采用盆栽试验,装风干土2.5kg·盆-1,研究了不同施磷水平对1年生杨桐Cleyera japonica苗木各项生长、生理指标及叶片含磷量的影响。结果表明:①施磷(P2O5)量在0～0.500g·盆-1范围内,杨桐各项生长、生理指标均随施磷量的增加而增加。当施磷量超过0.500g·盆-1后,各项生长、生理指标均表现下降趋势。②杨桐苗木叶片全磷含量,在适量的供磷范围内随施磷量的增加而增加,含磷量最高出现在0.500g·盆-1,超过此值后,随施磷量的增加而逐渐下降。③杨桐苗木各项生长指标与施磷量之间存在二次函数关系。综合本试验条件下各处理杨桐苗木施肥生长及生理效应可知,杨桐苗期最佳施磷量为0.441～0.603g·盆-1。更多还原

【Abstract】 Based on a pot experiment,the effects of phosphorus fertilization on growth and physiological indexes and phosphorus content in leaves of one-year-old Cleyera japonica seedlings were studied. Seven P(P2O5) levels were set,0(ck) ,0.125,0.250,0.375,0.500,0.625 and 0.750 g·pot-1. Results showed that(1) with increasing levels of P from 0 to 0.500 g·pot-1,growth and physiological indexes in C. japonica seedlings increased,whereas with P increases over 0.500 g·pot-1,all indexes decreased. Also,(2) P in leaves increased with increasing levels of P from 0 to 0.500 g·pot-1 but decreased gradually with further P. Finally,(3) quadric relationships between growth indexes and P were noted. Based on growth and physio-logical indexes for one-year-old C. japonica seedlings,proper application of P was from 0.441 to 0.603 g· pot-1.更多还原