近年来,国内外对农田林网效益的研究日益广泛深入,尤其对林网促进粮食作物产量和品质的提高越来越普遍地受到重视。国外关于林网保护下小麦、玉米、甜菜等作物质量的提高已有不少报道。我国也有关于林网对玉米等作物品质改善的研究,但对棉花 In recent years, the researches on the benefits of farmland shelterbelts have been increasingly extensive both at home and abroad, and more and more attention has been paid more and more attention to the improvement of the output and quality of food crops by the shelterbelts. Abroad on the protection of the forest network of wheat, corn, sugar beet and other crops have improved the quality of many reports. My country also has about Lin net improvement of corn and other crops, but for cotton