对吉林省西部10种典型水田防护林配置的林带结构因子进行调查,分析了不同林带的疏透度差异性并确定了各因子与有叶期疏透度(β有叶期)和无叶期疏透度(β无叶期)的相关性,建立了疏透度与主要林带主要影响因子的回归方程.结果表明:吉林省西部水田防护林林带分为3类:Ⅰ(1、5、7、10)、Ⅱ(2、9)、Ⅲ(3、4、6、8),其β有叶期和β无叶期值范围分别在0.2 ～0.28和0.5 ～0.6、0.4～0.5和0.8 ～0.85、0.3 ～0.4和0.6～0.8之间;胸径、树高、冠幅、枝下高、株行距和行数等因子与β有叶期和β无叶期存在相关性;并且其相应的最适范围分别为22.8～27.7 cm、15.6～17.9 m、4.5 m×3.5 m～5.4m×4.2m、6.6 ～7.1 m、1.8～4.3 m和3～4行.

To study the reasons for dormancy of Acer triflorum, seed germination and seedlings growth ofBrassica campestris in different concentrations of the methanol extract from Acer triflorum seed coats, pericarpand embryo were studied in order to investigate the relationship between the restraining substraces in seedcoat,pericarp and embryo in dormancy of Acer triflorum. The results showed that with the extractconcentration increased, the inhibitory effects of Brassica campestris seed germination rate, seedling shootelongation, stem length and simplified vigor index were gradually increased except the 30% pericarp methanolextract. In the same concentrations, the inhibitory effect of the embryo was relatively strong, the pericarp andthe seed coat were relatively weak. It was concluded that the inhibitors were distributed in all fractions of theseeds, and the existence of inhibitors in components of Acer triflorum seeds was the main cause of dormancy ofAcer triflorum seeds.