杉树是我国主要速生用材树种,深受群众喜爱。有些地方由于不讲究适地适树,在日照时间过长、土壤瘠薄的红壤丘陵也栽植杉树,以致出现成林不成材的“小老树”。如何低成本改造“小老树”低产林?新干县云峰岭林场提供了好的经验。一、深垦改造云峰岭采育林场五鼓山杉木人工林地,是由页岩发育而成的红壤丘陵,虽然坡度平缓,但土壤贫瘠,粘性重,又是向阳山坡。1 973年冬季造的杉树林至 Cedar is the main species of fast-growing timber in China, loved by the masses. In some places, trees are not suitable for planting trees, and the cedar trees are also planted in the red soil hills where the soil is barren in the sunshine for a long time, resulting in the emergence of a “poor old tree.” How to transform low-cost “small old tree ” low-yielding forest? Xingfeng Mountains Forest Farm provides a good experience. First, the deep reclamation Yunfengling mining and breeding ground Wu Gushan Cunninghamia lanceolata plantation, is developed from the shale red soil hills, although the slope is gentle, but the soil is barren, heavy, but also sunny hillside. 1 973 winter made of fir forest to