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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 cm
The change of ten-day-old growth of poplar seedling height planted in the current year indicated that three growth peaks occurred in the Horqin sandy land from mid-July to late August, with the highest growth peak in mid-August. There were two growth peaks between mid July and the middle of August. The peak of growth occurred in late July and ahead of the high growth. Regression analysis showed that the height growth and growth time of cuttings (d) Who showed L ogistic curve: Y = K / 1 + EXP (BO + B1 * X). This research is of great significance to the establishment of seedling management measures and early prediction of seedling biomass. The analysis of different seedling ages, differences in height between different varieties, and the indexes of height-diameter ratio and average height diameter indicated that the reasonable spacing of one-year-old seedlings in Horqin sandy land was 20cm × 70cm ~ 40cm × 70cm