摘要
采用沙培方法，在温室中研究了氮和磷对胡桃楸幼苗根系、叶和当年高生长的影响。结果表明，氮和磷均能影响细根的生长，尤其是磷对提高细根生物量具有明显的作用。对粗根，氮质量分数增加５０％，导致粗根生物量增加１４％；磷质量分数增加５０％，导致粗根生物量减少２３．４％；而氮和磷质量分数减少５０％，粗根生物量分别减少１５．３％和１０．３％。氮和磷质量分数增加５０％，叶生物量分别增加１７．４％和３．５％；氮和磷质量分数减少５０％，叶生物量分别减少４１．７％和１５．７％。增加氮含量，对地上部分总生物量和当年高生长量有明显影响，而磷则无明显影响。但是减少这两种养分含量，细根／叶生物量的比例明显提高。
Nitrogen and phosphorus are important nutrients for tree growth. In this
paper, the authors use sand pots, in green house, to study seedling root mass, leaf mass,
aboveground mass and height increments of Juglans mandshurica in different nitrogen and
phosphorus concentrations. Three nutrient solution levels, low concentration (N50% and P50%),
high concentration (N150% and P150%) and control(N100% and P100%)were designed in this
experiments. The results show that nitrogen and phosphorus with different nutrient solution
concentrations can increase fine root mass. Comparing with control experiments, fine root mass
increase about 12.5% and 25.5% while nitrogen and phosphorus are low concentrations, and
coarse root mass increase 14% while nitrogen concentrations is a high. Enhancing or
decreasing phosphorus concentrations, coarse root mass will reduce significantly. Leaf mass
will increase from 3.5% to 17.4% with high concentrations, and reduce 15.7% to 41.7% in low.
More nitrogen will produce higher total aboveground mass and height increments in this
experiments, phosphorus reduce total aboveground mass comparing with contrasts. Root
mass/shoot mass ratio in low or high concentrations have no significant difference, but fine root
mass/leaf mass ratio is higher in low nutrient concentrations.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1999年第1期1-4,共4页
Journal of Northeast Forestry University
基金
黑龙江省自然科学基金
关键词
氮
磷
胡桃楸
根系生长
Nitrogen
Phosphorus
Juglans mandshurica
Root systems
