栓皮栎播种苗年生长动态  

Annual Growth Dynamics of One-Year-Old Quercus variabilis Seedlings

作　　者：杨自立[1] 马履一[1] 贾忠奎[1] 王梓[1] 公宁宁[1] 

机构地区：[1]省部共建森林培育与保护教育部重点实验室(北京林业大学),北京100083

出　　处：《东北林业大学学报》2012年第5期9-12,共4页Journal of Northeast Forestry University

基　　金：国家"十一五"科技支撑计划项目(2006BAD24B0;北京市教育委员会学科建设与研究生培养项目"北京城市生态环境建设产学研联合培养研究生基地";中央高校基本科研业务费专项资金(BLJD200904)

摘　　要：为给栓皮栎(Quercus variabilis L.)苗木培育合理施肥提供理论依据,研究了其当年生播种苗高径生长、生物量积累和分配及苗体N、P、K质量分数的年变化规律。结果表明:①栓皮栎播种苗当年高径生长有2次高峰,其间生长量分别占全年总量的94.3%和95.6%;②8月为苗木生物量积累高峰期,该月生物量净增量(3.664 g.株-1.月-1)占全年总量的47.5%。而初期(5—7月)苗木以地上生物量积累为主(生物量占整株比例从63.7%升至70.1%),中后期(7月底后)根系生长加速(生物量占整株比例从29.9%升至59.5%);③器官N、P、K质量分数,初期(5月)较高,中期(6—9月)较低。后期(10月),根的N、P、K质量分数有所回升,茎相对稳定,叶持续下降。从1-0苗体N、P、K质量看,栓皮栎播种苗当年生长3元素积累量分别为:107、9、31 mg.株-1。An experiment was conducted to study the annual growth dynamics in height, diameter at ground level, accumulation and allocation of biomass, and contents of N, P, K in Quercus variabilis seedlings in order to provide a theoretical founda- tion for fertilizer application. Results indicated that there were two peaks in height and diameter at ground level of Q. vari- abilis seedlings in the first growing season, and the increments for the two periods accounted for 94.3% and 95.6% of the total biomass in the whole growing season, respectively. An obvious increase in biomass accumulation was observed in Au- gust, and the biomass increment was 3. 664 g per seedling per month, accounting for 47.5% of the total biomass for the whole year. Q. variabilis seedlings allocated more biomass to the aboveground parts during the early growing period （May to July）, and the biomass ratio of aboveground parts to the whole plant increased from 63.7% to 70.1%. However, the seedlings allocated relatively more biomass to roots after the end of July, and the biomass ratio of roots to the whole plant raised from 29.9% to 59.5%. Contents of N, P, and K in different organs were the highest at the end of May, and then decreased from June to September. However, the contents of N, P, and K in roots rose again to some extent at the late growing season （October）, while those in stems kept at a relatively stable level, and those in leaves descended to the low- est degree. Furthermore, the average contents of N, P, and K in one-year-old Q. variabilis seedlings were 107, 9, and 31 mg per seedling, respectively.

关 键 词：栓皮栎 播种苗 育苗 施肥管理 

分 类 号：S723.3[农业科学—林木遗传育种]