楸树育苗造林技术的研究

A Study on Seedling Culture and Afforestation Techniques of Catalpa bungei

育苗试验表明 ,楸树不同覆盖物育苗以塑料小棚最好 ,草袋与草帘次之 ;埋根育苗粗度以 1 .0～ 1 .5 cm、密度以 30 cm× 30 cm为佳 ;楸树的高生长在 7月前较慢 ,7～ 8月为高峰期 ,以后生长减缓 ,地径 6月前较慢 ,6～ 8月为高峰期 ,次后生长减缓 ;楸树的垂直根系在土壤中的分布平均 1 35 cm,塑料小棚苗木的生物量地上地下均大于草帘覆盖苗 ;不同径级苗生物量是大径级 >中径级 >小径级 ,其径干、叶片、根系分配比例为 2 7∶ 35∶ 38较合理。造林试验表明 ,楸树适宜海拔 1 0 0 0 m以下地方生长 ;楸树栽培以大穴 ( 80 cm× 80 cm× 80 cm)

This paper describes the techniques of seedling culture and afforestation of Catalpa bungei the results indicated that: the litter plastic cote used as covering over the seedbed is best, grass sack and grass shade are better than the others. If we culture seedlings through burying roots, optimal diameters of roots are between 1.0 cm and 1.5 cm , optimal planting density is 30 cm×30 cm. Before July the height growing process of Catalpa bungei is slow, and fast during July and August, subsequently the process slows down. The vertical distribution of Catalpa bungei root system is 135 cm under the ground. Not only overground but also underground biomass of Catalpa bungei seedling under litter plastic cote is more than that under grass sack and grass shade. Catalpa bungei occurs suitably at elevation below 1 000 m. Applying the big pit(80 cm×80 cm×80 cm) is optimal planting mode with Catalpa bungei.