南京林业大学学报（自然科学版）Issue(5)：79-84,6.DOI:10.3969/j.issn.1000-2006.2014.05.016
供氮水平对长白落叶松幼苗生物量、氮磷浓度及其季节变化的影响
Effects of different nitrogen supply on biomass, N and P concentration and their seasonal variation of Larix olgensis seedlings
摘要
Abstract
The effects of different concentration of nitrogen treatments on the biomass, nitrogen and phosphorus partition in roots, stems and leaves of one-year-old Larix olgensis seedlings were studied by a sand culture experiment in green-house. The results suggested that N supply could significantly increase the seedling biomass. The biomass of roots, stems and leaves were the highest when 8 mmol/L nitrogen was applied in July, August and September. The biomass of leaves decreased gradually, while that of roots increased from July to September. The N concentrations increased significantly a-long with the N supply levels increasing. The mean N concentrations in roots, stems and leaves in the latter growth stage were 1.46, 1.48 and 1.17 times respectively more than that in the initial stage. The P concentrations fluctuated with the N levels change. The N stocks of whole plant increased markedly as the growth of plant, and it was 2.86 times more in Sep-tember than in July. The N allocation also varied in leaf, stem, and root. The proportion of N allocation in leaf was the highest in July (60% in average). The proportion of N allocation in root increased with plant growth, which was the high-est in September (41% in average). There was no obvious difference in N stocks among different N levels. The P stocks of the roots, stems and leaves were basically consistent with the N, but the variation scope was smaller than that of N.关键词
长白落叶松/施氮处理/氮磷贮量/生物量分配Key words
Larix olgensis/nitrogen treatment/stocks of nitrogen and phosphorus/biomass allocation分类
农业科技引用本文复制引用
李海霞,许传玲,郭树平,郭成博,白卉..供氮水平对长白落叶松幼苗生物量、氮磷浓度及其季节变化的影响[J].南京林业大学学报（自然科学版）,2014,(5):79-84,6.基金项目
黑龙江省科技攻关重大项目（GA09B202-02）；黑龙江省财政厅科研计划项目 （）
