【摘要】 对二年生三倍体毛白杨进行了施肥试验,分析了不同施肥水平、不同生长月份以及不同无性系对胸径、树高生长量和叶片N、P、K含量的影响,及其在生长季的变化规律,蒸腾作用和气孔阻力的不同生长月份和日变化情况。结果表明,不同施肥水平和生长月份对生长量和叶片N、P的含量有极显著影响;不同的无性系对K的含量有极显著的影响;在生长季毛白杨生长量与叶片N、P、K含量的变化规律相吻合;不同生长月份以及一天内不同时间,蒸腾速率和气孔阻力均存在极显著差异;蒸腾速率和气孔阻力日进程呈单峰曲线,高峰出现在中午。更多还原

【Abstract】 Fertilization experiments in two-year old triploid clones of Populus tomentosa were conducted.It was focused on the growth,the contents of N,P,K and their changes growth seasons.Meanwhile,the transpiration rate and stomatal resistance were also studied.The results showed that there were significant effects of fertilization and month on the growth and the content of N,P,but not on that of K.There was significant effect of clones on K.The variety rule of the growth and the contents of N,P,K were simultaneous in the course of growth season.There were significant monthly and daily differences in either transpiration rate or stomatal resistance.The courses of transpiration rate and stomatal resistance showed to be one peak curve in a day,and the peak appeared at midday.更多还原