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对天然林进行择伐作业,是西北、西南高山林区森林经营的方向。处于长江、黄河上游森林水平和垂直分布边缘地带的森林,用皆伐方式进行森林采伐,对保持水土、涵养水源、国土保安和恢复森林植被,都是不适宜的。甘肃省洮河林区是一个开发了70多年的老林区,现在仍能青山常在,主要经验就是把择伐作为森林采伐的主要方式。因此,研究择伐作业时天然林的林价,对这一地区确定合理的木材价格和进行森林永续经
Selective cutting operations on natural forests is the direction of forest management in northwest and southwest high mountain forest areas. Forests on the fringe of the Yangtze River and the upper reaches of the Yellow River and their vertical distribution are not suitable for maintaining the soil and water, conserving the water source, restoring the security of the land and restoring the forest vegetation. The Gansu Bahe Forest Area is a developed old forest area that has been in existence for more than 70 years. Nowadays, there is still a long history of green hills. The main experience is that selective cutting is the main mode of forest harvesting. Therefore, to study the forest prices of natural forests at the time of selective operations, to determine the reasonable timber prices in this region and to carry out sustainable forest management