【摘要】 通过生物量和营养元素含量的测定 ,研究了福建三明莘口教学林场 34年生木荚红豆人工林N ,P ,K元素现存量 .结果表明 :木荚红豆人工林乔木层地上各组分的N ,P ,K浓度均以叶最高 ;根系的N ,P ,K浓度基本上随径级的减小而增大 .木荚红豆人工林N ,P ,K的现存量分别为 818.0 35 ,330 .2 2 7和 85 6 .831kg hm2 .乔木层地上部分N ,P ,K元素现存量的 5 9.0 % ,4 7.6 %和 6 4 .2 %分布在枝和叶中 ,采伐木荚红豆树树干对立地的养分损失较小更多还原

【Abstract】 Based on the determination of biomass and nutrient content, standing crop of N, P and K elements were measured in a 34 year old Ormosia xylocarpa plantation located in Xinkuo Teaching Tree Farm of Sanming, Fujian Province. It shows that the concentrations of N, P and K elements in the aboveground fractions of tree story in Ormosia xylocarpa plants are highest in leaves. The concentrations of N, P and K in roots almost increase with the decreasing of diameter sizes. Standing crop of N, P and K elements were 818.035?kg/hm 2 , 330.227?kg/hm 2 and 856.831?kg/hm 2 respectively in the plantation. 59.0% N, 47.6% P and 64.2% K were distributed in branches and leaves. It suggestes that trunk harvest will cause nutrient loss slightly in the site.更多还原