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在温室内以中美山杨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、16mmol/L)处理对中美山杨幼苗生物量分配以及根、茎、叶氮浓度的影响。结果表明:(1)氮素供给浓度显著影响幼苗生物量,7月份和9月份在N16水平下达最大,8月份在N8水平下达最大,从7月份到9月份,叶片中的生物量比例逐渐降低,根系的生物量比例逐渐增加。(2)随着供氮水平的提高,苗木体内根、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1.16、1.38、1.03倍。(3)本试验可为中美山杨幼苗培育提供理论依据和技术参考。
Sand culture experiments were conducted in the greenhouse with Populus simonii seedlings. Four different nitrogen concentrations (1,4,8 and 16 mmol / L) were used to study the biomass allocation of Populus davidiana as well as root, stem and leaf nitrogen Effect of concentration. The results showed that: (1) The nitrogen supply concentration significantly affected seedling biomass, reached the maximum at N16 in July and September, and reached the maximum at N8 in August. From July to September, the proportion of biomass in leaves gradually decreased , The root biomass gradually increased. (2) With the increase of nitrogen supply, the nitrogen concentration in roots, stems and leaves of nursery stock increased obviously. At the end of growing stage, the average nitrogen concentration in roots, stems and leaves reached 1.16,1.38 and 1.03 times of the initial growth stage. (3) This experiment can provide theoretical basis and technical reference for poplar seedling cultivation in the United States.