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一、低产林改造 玛纳斯平原林场,原有白榆次生林近五千亩,多为解放后萌发的,林木分布多为星丛状,断断续续,林窗较多,林相参差不齐,林地凸凹不平,灌溉非常困难。尤其是一九七○年以后,因干旱缺水,病虫危害严重,生长势衰弱,老树的根部大部份已经空心。投资管理这种林木确实没有经济价值。对此,林场作出了更新规划,从一九七六年开始,有计划地逐年逐块皆伐,挖根、修路、
First, the transformation of low-yield forest Manas plain farm, the original white elm secondary forest nearly five thousand acres, mostly after the germination of the liberation, forest mostly star cluster, intermittent, more gaps, forest uneven, uneven woodland Uneven irrigation is very difficult. In particular, since 1970, most of the roots of old trees have become hollow due to drought and water shortage, serious harm to pests and diseases and weak growth. Investing in such trees does not have economic value. In response, the forest farm has made an updated plan. Starting from 1976, it plans to cut down trees and cut roots and roads one by one year by year.