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

作　　者：李海霞 许传玲 郭树平 郭成博 白卉 

机构地区：[1]黑龙江省林业科学研究所,黑龙江哈尔滨150081 [2]敦化市林业局,吉林敦化133700

出　　处：《南京林业大学学报（自然科学版）》2014年第5期79-84,共6页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：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(2012-01)

摘　　要：在温室内以长白落叶松幼苗为材料进行砂培试验,探讨了4种不同氮素浓度(1、4、8、16 mmol/L代号分别为N1、N4、N8、N16)处理对长白落叶松幼苗生物量以及根、茎、叶氮磷分配的影响。结果表明:1氮素供给浓度显著影响幼苗生物量,7、8、9月份均在N8水平下达最大,从7月份到9月份,叶片生物量占全株比例逐渐降低,而根系生物量所占比例逐渐增加。2随着供氮水平的提高,苗木根、茎、叶中氮浓度明显增加。生长末期根、茎、叶中氮浓度平均达到生长初期的1.46、1.48、1.17倍。不同氮处理下幼苗根、茎和叶全磷浓度呈现波动性变化。3幼苗体内氮贮量随着落叶松的生长呈明显上升趋势。9月份全株氮贮量比7月份平均增加了2.86倍。氮贮量分配在不同部位有很大不同,分配到叶片中的比例在7月份最高,平均为60%,而分配到幼苗根系中氮贮量的比例随苗木的生长而逐渐增加,在9月份相对值最高,达到41%。不同氮处理之间氮贮量分配比例相差不大。4长白落叶松幼苗根、茎、叶磷贮量变化规律与氮贮量一致,只是变化幅度低于氮。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 greenhouse. 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 along 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 September 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 highest 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 

分 类 号：S714.5[农业科学—林学] Q945.12[生物学—植物学]