论文部分内容阅读
以1年生平邑甜茶(Malus hupehensis Rehd.)盆栽幼苗为试材,研究盆栽土壤中沸石施用量对幼苗生长及15N–尿素利用、损失的影响。结果表明,植株的株高、总鲜样质量及对15N–尿素的利用率在生长前期均以低用量沸石处理(沸石0.6和1.2 g·kg-1)最高,但随着生长期的推移,随沸石用量的增加而逐渐提高,到生长后期植株的株高、总鲜样质量和15N利用率均以最高用量处理(沸石2.4 g·kg-1)最高,分别为29.78 cm、29.64 g和17.91%,显著高于对照(23.28 cm、22.52 g和8.81%),但4个沸石处理间无显著差异。整个生长过程中,植株地上部从肥料中吸收分配到的15N量对该部分全氮量的贡献率(Ndff)高于地下部。在生长前期地上部和地下部的Ndff同样以低用量沸石处理(沸石0.6和1.2 g·kg-1)最高,而到生长后期二者均以沸石2.4 g·kg-1处理最高,分别为19.04%和8.34%,显著高于对照(16.27%和5.83%)。施用沸石可以减少土壤氮素的损失,并且沸石用量越高效果越显著。施用沸石后显著促进了植株的生长及对15N的吸收利用,降低了土壤氮素的损失,以沸石2.4 g·kg-1处理效果最佳。
A pot experiment was conducted with one-year-old potted seedlings of Malus hupehensis Rehd. To study the effects of the amount of zeolite in potted soil on seedling growth and 15N-urea utilization and loss. The results showed that plant height, total fresh weight and utilization of 15N-urea were the highest in the early stage of growth with low dosage of zeolite (zeolite 0.6 and 1.2 g · kg-1), but with the growth period, With the increase of zeolite dosage, the plant height, total fresh weight and 15N utilization rate of the late growth stage were the highest (2.4 g · kg-1 zeolite), which were 29.78 cm, 29.64 g and 17.91 %, Significantly higher than the control (23.28 cm, 22.52 g and 8.81%), but no significant difference between the four zeolite treatment. Throughout the growth process, the contribution of the 15N uptake of fertilizer from the plant shoot to the total nitrogen content in the shoot (Ndff) was higher than in the subsurface. In the early growth stage, Ndff also had the highest contents of zeolite (0.6 and 1.2 g · kg-1) and the highest concentration of zeolite (2.4 g · kg-1), respectively, 19.04 % And 8.34%, significantly higher than the control (16.27% and 5.83%). Application of zeolite can reduce the loss of soil nitrogen, and the higher the amount of zeolite effect is more significant. The application of zeolite significantly promoted plant growth and 15N uptake and utilization, reducing soil nitrogen losses, with zeolite 2.4 g · kg-1 treatment best.