氮素营养对长白落叶松移植苗生长及养分状况的影响  

Effects of Nitrogen Fertilization on the Growth and Nutrient Status in Larix olgensis Seedlings

作　　者：祝燕[1] 刘勇[1] 李国雷[1] 林平[1] 康瑶瑶[1] 孙宇[1] 

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

出　　处：《林业科学》2011年第9期168-172,共5页Scientia Silvae Sinicae

基　　金：中央高校基本科研业务费专项资金资助(JD2011-3;BLJD200905);国家"十一五"科技支撑计划课题(2006BAD24B01)

摘　　要：尽管少数研究认为造林效果与苗木体内氮含量无关甚至负相关（Gleason et al.,1990;Boinvin et al.,2004）,更多的研究表明初始氮含量与造林效果呈正相关,如蓝桉（Eucalyptus globulus）高、The aim of this study was to assess effects of supplemental nitrogen（N） on Olga Bay larch（Larix olgensis） seedlings at late stage of growing season in a nursery.From July to September 2009,the seedlings was fertilized with nitrogen during a period of 2 weeks as follows：control（no fertilization）,60 kg N·hm-2,（two applications of urea with each 30 kg N·hm-2）,120 kg N·hm-2（four applications）,and 180 kg N·hm-2（six applications）.By the end of growing season,the seedlings fertilized during fast-growing and hardening period had greater shoot biomass,but no significant differences in height,root collar diameter,shoot to root mass ratio,and root biomass in comparison with the control seedlings.Compared to control seedlings,the seedlings fertilized in August and September increased root and shoot N concentrations by 11.5%-15.9% and 6.0%-8.2%,respectively,and the P concentrations by 5.4%-22.9% and 16.7%-22.7%,respectively.In the mid of October,the N concentration increased sharply,while the P concentration declined substantially.This study suggested that P fertilization would be recommended at the late growth period in L.olgensis seedling cultivation to release the decline of the P concentration.

关 键 词：长白落叶松 氮肥 苗木质量 养分含量 

分 类 号：S723.7[农业科学—林木遗传育种]