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苏联最近几年多方面调查研究了不同结构的林带对农作物产量和质量的影响。综合比较研究证明,稀疏林带在草原条件下所起的防治作用最大。农田产量可比透风结构林带增加75％和1倍。蛋白质含量是质量的重要指标之一。研究材料证明,谷物蛋白质含量如增加1％,全苏每年即可增加蛋白质60万顿,可以满足全国人民一年对植物蛋白的需要。谷物蛋白质含量因天气和气候条件而异,因而林带对谷物蛋白质含量有明显影响。有林带保护的农田上小麦的物理性能指标
In recent years, the Soviet Union conducted many investigations and studies on the impact of different types of forest belts on the yield and quality of crops. Comprehensive comparative studies have proved that sparse forest belt played the greatest role in the control of grassland. Farmland yield can be 75% and 1 times higher than that of ventilated forest. Protein content is an important indicator of quality. Research materials show that if the grain protein content increased by 1%, the entire Soviet Union can increase the protein 60 million tons per year, to meet the needs of the people of the country a year on plant protein. Grain protein content varies with weather and climatic conditions, and forest belts have a significant effect on cereal protein content. Physical properties of wheat on farmland with shelterbelts