白银地区优良林草品种选择与林草复合经营技术试验

SELECTION OF GOOD TREE AND HERB VARIETIES AND EXPERIMENT OF COMPOSITE MANAGEMENG TECHNOLOGY OF TREES AND HERBS IN BAIYIN DISTRICT

对优良林草品种的选择和林草复合经营技术试验结果表明 :引进的速生杨、速生柳各无性系间的扦插繁育和植苗造林成活率均不存在显著性差异 ;速生杨、柳苗期生长量与对照 (新疆杨、旱柳 )相比差异显著 ,90 %以上可当年育成一级壮苗 ,造林后速生杨、柳幼树初期生长量显著快于对照 ;引进的美国紫花苜蓿品种在林草复合经营中的品质和产量与对照相比有明显优势 ;林草间作的经济效益远远高于普通农作物种植 ,林草复合系统中草的收益完全可以保证林木成材前幼林的抚育费用 ,并可实现盈利 90 0～ 15 0 0元 /hm2 。

Experimental results indicated that for the introduced fast-growing poplar and willow the cutting cultivating and the seedling planting of all clones had no significant difference in survival rate. Compared to the contrast (Xinjiang poplar and hankow willow), the fast-growing poplar and willow showed a significant difference in increment during seedling stage, and 90% of seedlings could develop to first-grade, strong seedlings in the same year. After planting, the fast-growing poplar and willow seedlings are remarkably faster than that of contrast. The introduced varieties of Medicago sativa had marked dominance in quality and yield for composite forest and herb management in contrast to the control.The economic benefit of inter-cropping of trees and herbs is much higher than that of general cropping of crops. The income of herb in the composite system of trees and herbs can fully compensate the tending expenses of young stand and realize the profit of 900-1500 yuan per hectare.