栓皮栎人工林养分循环的研究

Studies on Nutrient Cycle in Quercus variabilis Plantation in the Beijing Xishan National Forest Park

该文对13种元素在36年生的栓皮栎人工林中的积累分布和生物循环进行了研究.结果表明:林分对大量元素的年吸收量为96.32kg/hm^2·a,存留量为23.24kg/hm^2·a,归还量为73.08kg/hm^2·a,生物循环速率为0.76;林分对微量元素的年吸收量为1 831.96g/hm^2·a,存留量为429.46g/hm^2·a,归还量为1 402.50g/hm^2·a,生物循环速率亦为0.76.每生产1t干物质需要大量元素和微量元素分别为20.82kg和385.96g.这些数据可为培育栓皮栎林提供参考.

The accumulation,distribution and biological cycling of 13 nutrient elements in a 36-year-old Quercus variabilis plantation have been studied.Results show that the absorption of nutrient elements is 96.32kg/hm~·a,the retained ammount 23.24kg/hm^2·a,the restitution 73.08kg/hm^2·a and the biological cycling velocity 0.76;that the absorption of microelements is 1 831.96g/hm^2·a,the retained 429.46g/hm^2·a,the restitution 1 402.50g/hm^2·a and the biolog- ical cycling velocity 0.76.One ton dry-matter accumulation needs 20.82kg nutrient elements and 385.96g microelements.Those data will be given as a reference to cultivation of Quercus vari- abilis forests.