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间伐是造林后的一项营林技术措施,也是农田防护林抚育管理的重要技术环节。它是在林木生长过程中,通过人工采伐,减小林木密度,改善林木生境条件,调整林木个体与群体的关系,充分利用林地空间,使林木正常生长发育,快速成材,以期最大限度地发挥林带的防护效益和经济效益。 营造农田防护林的主要目的,一是改善农业生产的环境条件,保护农作物免受或减轻自然灾害;另一个目的是生产优质木材,特别是在森林资源匮乏的新疆,农田防护林更应起到生态和经济两方面的作用,成为生态经济型的复合林种,即防护用材林。实践证明,在运用其它系列速生丰产技术措施外,再施以适时间伐,可使农田防护林达到防护用材林的要求。
Thinning is a silvicultural technical measure after afforestation, and also an important technical link in the management of farmland shelterbelts. It is in the process of forest growth, through artificial logging, reduce forest density, improve forest habitat conditions, adjust the relationship between individual forest and groups, make full use of forest space, so that the normal growth and development of trees, quickly become useful, with a view to maximize the development of forest belt Protection and economic benefits. The main purpose of creating farmland shelterbelt is to improve the environmental conditions of agricultural production and protect crops from natural disasters. Another purpose is to produce high-quality timber, especially in Xinjiang, where forest resources are scarce, and farmland shelterbelts should play an ecological and The role of both economic and ecological become eco-economic compound forest species, that is, timber forest protection. Practice has proved that the use of other series of fast-growing techniques and measures, and then applied to the time interval, can make the farmland shelterbelts timber forest protection requirements.