瑞典能源柳引种苗期生长特性的研究

Growth Characteristics of Different Clones of Energy Willow after Introduction

本研究以乡土树种红柳为对照（CK），在西北农林科技大学教学实验苗圃，对引种的8个1a生瑞典能源柳无性系进行物候、高与地径的生长动态及生物量的研究。结果表明：（1）8个瑞典能源柳无性系均能在杨陵地区完成正常的生长周期，并且成活率均达到90％以上，与CK差异显著（P〈0．05）；（2）除瑞能D，瑞能1与红柳只有一次高生长高峰期外，其它无性系都有2个高生长高峰期，高的生长速生期集中在5月下旬-7月中旬，其净生长量占全年生长量的47．1％～59．6％。（3）9个柳树无性系均有3个地径生长高峰期，但是生长高峰期的时间不完全相同，地径生长速生期集中在5月下旬-7月上旬，其净生长量占全年的35．8％～51．6％。（4）8个瑞典能源柳无性系生物量总量都高于CK，并且除瑞能1外，都与CK差异显著，其中瑞能C，瑞能E，瑞能2三个无性系根系生物量也与CK差异显著，证明其根系发达，可能比乡土红皮柳更适宜西北地区生长。

Taking local willow species Salix purpurea as the control, the growth characteristics of 8 clones of annual energy willow introduced from Sweden to Yangling, China were investigated on phenology, growth rhythm of height and basal diameter, and the biomass. The results were as follows. （1） All of 8 clones of energy willows introduced could grow well in Yangling with the average survival rate of over 90%, significantly different from the control （p〈0.05）. （2）Except for S. schwerinii, S. virninalis and S. purpurea, other clones exhibited 2-peak height growth periods： late May and middle July, from which the net growth accounted for 47.1%-59.6% of the total growth of the whole year. （3） 9 willow clones had 3-peak basal diameter growth periods, and the time of growth peak was different, centralized at the last ten days of May to the first ten days of July, the net growth accounted for 25.8%-51.6% of the total growth. （4） The total dry biomass of Sweden energy willow were higher than that of the control. The differences were significant with CK except for S. viminalis, in which S. viminalis, S. virninalis and S. dasyclados also showed significant difference with the control in root biomass, indicating their well developed root system, and more suitable to grow in northwest China than the control.