林业科学2016，Vol.52Issue(4)：21-29,9.DOI:10.11707/j.1001-7488.20160403
氮肥和容器深度对栓皮栎容器苗生长、根系结构及养分贮存的影响
Effects of Nitrogen Supply and Container Size on Seedling Growth, Root Characteristics,and Nutrient Status in Quercus variabilis Container Seedlings
摘要
Abstract
Objective]Nitrogen( N) supply and container type have each proved to effectively regulate seedling quality. In this study, we tested if the combination of the two approaches couldimprove seedling quality and produce a superposition effect on seedling growthin order to provide a theoretical basis in the containerized seedling cultivation.[Method]Quercus variabilis,with a dominant taproot,was reared in two different depth containers(25 cm,36 cm) with application of either deficient(25 mgN·seedling -1) or luxury(100 mgN·seedling -1) nitrogen supply,in a two factors completely randomize design. Seedling growth,root characteristics,and nutrient concentration were measured at the end of the growth season. [Result]N supply and container depth were significantly interacted on root N concentration,root volume,andsurface area for medium-class roots(2. 0 <D≤3. 0 mm),indicating that interactive effects of N supply and container depth were associated with underground rather than aboveground attributes. The combination of 25 mgN-36 cm container promoted root development with medium root classes while the combination of 100 mgN-36 cm container improved root N concentration. For the main effects,high N supply favored RCD,N and K concentration in roots. Container depth yielded more profound effects on root characteristics compared to N supply. Deep container facilitated root growth with root diameter between 3 and 4 mm whereas shallow one led to root spiraling. Additionally deep container increased seedling height,stem dry mass and N concentration. [Conclusion]Both the interactive and main effects of N supply and container depth indicated the necessity of combining the two approaches to improve seedling quality. The optimum combination of 100 mgN and 36 cm container was recommended for the container seedling production of this species with a dominant taproot.关键词
容器苗/氮肥/容器深度/根系结构/苗木生长/养分浓度Key words
container seedling/nitrogen supply/container depth/root architecture/seedling growth/nutrient concentration分类
农业科技引用本文复制引用
程中倩,李国雷..氮肥和容器深度对栓皮栎容器苗生长、根系结构及养分贮存的影响[J].林业科学,2016,52(4):21-29,9.基金项目
中央高校基本科研业务费专项(TD2011－08) （TD2011－08）
北京市共建项目专项 （）
“十二五”农村领域国家科技计划(2015BAD15B01)。 （2015BAD15B01）
