摘要
对当年栽植的杨树插条苗高径的旬生长量变化分析指出 ,在科尔沁沙地高生长在 7月中旬～ 8月下旬出现 3次生长高峰 ,生长最高峰出现在 8月中旬 ,而径生长在 7月中旬～ 8月中旬出现两次生长高峰 ,生长最高峰出现在 7月下旬 ,比高生长出现时间超前 ,对插条苗高径生长量与生长时间 ( d)回归分析指出 ,二者呈 L ogistic曲线 :Y=K/1+EXP( BO+B1*X)。该项研究对于苗期抚育管理措施制定和苗木生物量早期预测具有重要的意义。对不同苗龄、不同品种间高径差异及高径比和平均高径等壮苗指标的分析指出 ,在科尔沁沙地培育一年生苗合理株行距为 2 0 cm× 70 cm～ 40 cm× 70
The analysis of the ten-days growth of one-year saplings showed that three growth peaks appear from mid July to late August, and the highest peak is in mid August. The two diameter growth peaks appear from mid July to mid August, and the highest peak is in late July before the time of heigh growth.The regression analysis indicated that height and diameter increment correlate with the growth time and this relationship can be expressed by Logistic curve: Y=K/EXP(BO+BI*X). These results are importan to formulate policies of tendency and managenent and to calculate the increment of young saplings. The analysis of the index of growth variation, height-diameter ratio and average height, diameter for different clones and ages showed that the plant spacing is 20cm-40cm and the row spacing is 70cm for one-year sapling.
出处
《内蒙古农业大学学报（自然科学版）》
CAS
2000年第2期63-68,共6页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
三北 0 0 9项目
