【摘要】 本文通过播种育苗,研究长序榆苗期(一年生)在生长过程中,生物量的变化规律。经过定期测定,回归分析,模拟了苗木不同器官之间生物量异速生长的回归方程。结果表明密度对生物量有着明显的相关关系,一年生苗木,以每公顷45～60万株对其地下部份与地上部份的生物量比例为最适宜。更多还原

【Abstract】 In order to find out the regularity of biomass change of Ulmus elongata in the course of annual growth, experiments with seed propagation of Ulmus elongata has been done.Through regular investigation and regression analysis, regression equations to simulate the" different-speed-growth of biomass of,the seedlings’different organs have been obtained . The results of researches show that density has an apparent connection with the biomass and that 4.5×l05-6.0×105s·hm-2are suitable density,in which both quality and quantity are in good condition.更多还原