摘要
采用311-A混合最优回归设计,以强酸性赤红壤为培养基质,开展柚木苗期Ca,B,N营养元素配比盆栽试验。结果表明:不同配比处理对柚木无性系幼苗高和地径生长,叶、茎、根生物量影响均达极显著水平。Ca是促进酸性赤红壤柚木苗木高、地径生长和叶、茎、根部器官生物量积累的营养因子,也是柚木苗木生长的限制因子。B对苗木生长影响不显著,Ca与B之间不存在交互作用。苗木对N反应敏感,在低Ca量和不施Ca的情况下,随追施N量的增加,苗高、地径生长和总生物量积累受到抑制。贫瘠强酸性赤红壤上培育柚木,应适当增加Ca(氧化钙)和减少N(尿素)的用量。柚木苗期最适Ca,B,N配比为:Ca∶B∶N=1.2g·kg-1∶0.4mg·kg-1∶0.3g·kg-1,相应最佳营养物质配比为:CaO∶H3BO3∶(NH2)2CO=1.68g·kg-1∶2.3mg·kg-1∶0.65g·kg-1。
A potting culture experiment with optimal hybrid regression design （311-A） was carried out to study the growth response of cloned teak （Tectona grandis） seedlings to calcium （0 - 1. 2 g·kg^-1 ）,boron （0 - 0. 8 mg·kg^-1 ） and nitrogen （0 - 1. 2 g·kg^-1 ） supply in acidic lateritic red soil. Extremely significant differences were found in growth of seedling height,root collar diameter,and oven-dry weights of leaves,stems and roots between 11 treatments. Ca,a major nutrient element,was identified to be a limiting factor for teak seedling growth in acidic lateritic red soil. B had no remarkable impact on seedling growth and no interaction with Ca,whereas,there was interaction between N and Ca. The seedling height,root collar diameter and total dry mass were evidently restrained by addition of N when no or little Ca was applied. To manage teak in strongly acidic lateritic red soil,it is necessary to apply enough Ca and less N. The optimal nutrient rate in pots was Ca 1. 2 g·kg^-1 ,B 0. 4 mg·kg^-1 and N 0. 3 g·kg^-1 ,equivalent to CaO of 1. 68 g·kg^-1 ,H3 BO3 of 2. 3 mg·kg^-1 ,and （NH2 ）2 CO of 0. 65 g·kg^-1 .
出处
《林业科学》
EI
CAS
CSCD
北大核心
2010年第5期102-108,共7页
Scientia Silvae Sinicae
基金
国家‘十一五’科技支撑专题"柚木珍贵用材林高效培育技术"(2006BAD24B0901)的部分研究内容
关键词
柚木
幼苗
酸性赤红壤
钙
硼
氮
Tectona grandis clone
acidic lateritic red soil
calcium
boron
nitrogen
seedling growth
