不同种源砂生槐种子及幼苗生长变异研究

Variations of the Seed and Seedling Growth of Sophora moorcroftiana from Different Provenances

对砂生槐4个种源的种子、幼苗性状进行系统分析。结果表明,种源间种子性状差异显著。种子性状千粒重以拉萨种源的最重,达37.64g,朗县种源种子最长,达0.50cm,拉萨、日喀则产种子形态为卵圆形,米林、朗县产种子形态为长卵圆形。砂生槐苗高生长进程符合Logistic曲线方程,苗高生长期131～134d,速生期46～57d,速生期生长量占总生长量比率为61.0%～62.3%。种源间苗木生长性状差异显著或极显著,拉萨种源的生长量最大,一年内积累的干生物量最多,朗县种源的根系发达。

The characteristics of the seeds and seedlings of Sophora moorcroftiana from 4 provenances were systematically examined. The results showed that differences were significant among the seeds from 4 provenance. The heaviest weight of 1 000 seeds was 37.64 g from Lhasa. The longest length of seeds was 0.50 cm from Lang County. The seeds of Lhasa and Xigaze were oval, while the seeds of Milin and Lang County were long ovoid. Seedling height growth of S. moorcroftiana was in accordance with Logistic curve equation. Seedling height stages were 131 to 134 d. The fast growing periods were 46 to 57 d. The proportion of the growth during fast-growing period accounted for 61.0% to 62.3% of the total growth. Differences in seedlings growth among the provenances were significant at the level of 0.05 or 0.01. The most growth increment and the highest accumulation of dry biomass were observed in those from Lhasa. Seedlings with developed root system were from Lang County.