论文部分内容阅读
本文报道了在我国中温带地区进行的杨树大面积丰产栽培模式产业化开发的研究 ( 1 993～ 1 998)。结果表明 ,在较寒冷干旱的辽宁 2 0 0 0hm2 林地上 ,采用良种良法 ,使造林成活率达到 97%以上 ,保存率达到95 7% ,幼林树高年平均生长 2 6～ 3 .0m ,胸径年平均生长 2 2～ 3 7cm ,创造了国内杨树大面积高产纪录 ;林粮间作经济效益良好。
This paper reports the industrialized development of large-scale high-yield cultivation of poplar in China’s temperate regions (1993 ~ 1998). The results showed that in the relatively cold and dry Liaoning 2000 hm 2 forest, the good seed method was adopted to make the afforestation survival rate reach over 97% and the preservation rate to reach 95.7%. The average growth height of young forest trees was 26 ~ 30.0m and the DBH The average annual growth of 22 ~ 37cm, creating a large area of domestic poplar record high yield; forest grain intercropping good economic benefits.