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一、大青杨人工林发展概况黑龙江省将大青杨作为更新树种进行栽植始于五十年代末期。目前,成林面积约10万余亩。主要分布在伊春林区和松花江林区,仅苇河一地就有近3万亩,并继续以每年更新4—6千亩的速度递增。由于天然林的不断开发,可采资源明显减少。杨树具有易繁殖、产量高、工艺成熟龄早的特点,适当发展杨树已成迅速增加森林资源的有效途径。作为我省东部山区的乡土树种大青杨,理应有一个较大的发展。但实际情况却是重视不足。主要原因不外乎:
First, the development of Daqingyang plantation Heilongjiang Province Poplar cultivation as a replacement tree species began in the late fifties. At present, Chenglin area of about 10 acres. Mainly distributed in the Yichun forest area and the Songhua River forest area, only the Wei River there are nearly 30000 acres, and continue to update the annual increase of 4-6 acres. Due to the continuous development of natural forests, recoverable resources have obviously decreased. Poplar has the characteristics of easy reproduction, high yield and mature maturity of technology. Proper development of poplar has become an effective way to rapidly increase forest resources. As a native tree in the eastern mountainous province of Poplar, there should be a greater development. However, the actual situation is inadequate attention. The main reason is nothing more than: