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营造农田防护林的主要目的,在于改善农业生产的环境条件,提高环境质量,保护农作物免受或减轻自然灾害。大量的科研、观测资料表明,农田防护林在改善环境条件、保田增产方面起着重要作用。尤其在干旱、高温、热风、沙暴、盐碱严重的农业区,营造大面积农田林网具有显著的防护效应,可增产粮食15—20％。大通县地处高寒,气候温凉,无干热风和大的风害,营造农田林网是否有大面积增产作用?而林带胁
The main purpose of creating shelterbelts for farmland is to improve the environmental conditions of agricultural production, improve the quality of the environment and protect crops from or mitigate natural disasters. A large number of scientific research and observation data show that farmland shelterbelt plays an important role in improving environmental conditions and increasing yield in Baotian. Especially in arid, hot, hot wind, sandstorm, serious saline-alkali agricultural areas, creating a large area of farmland forest network has a significant protective effect, can increase grain production 15-20%. Datong County is located in the alpine, cool climate, no hot and dry wind and large wind damage, to create a farmland forest net large-scale production increase?