蒙城砂姜黑土试验区农田防护林体系的建设和完善对农业持续发展起着重要的作用。经过 5a的观测表明 :“八·五”建成的农田防护林体系其经济效益相当可观 ,1hm2 林网用地经济效益达 614 .7元 ,小麦年增产 6%～ 12 % ,玉米年增产 6%～ 10 % ;生态效益也相当可观 ,综合防风效能达 3 5 %～ 40 % ,耕作层土壤贮水量增加 7.4% ,空气相对湿度提高 6.3 % ,具有冬保温夏降温 ,克服干热风危害的功能 The construction and perfection of farmland shelterbelt system in Mengcheng lime-black soil test area plays an important role in the sustainable development of agriculture. The observation of 5a shows that the economic benefit of the farmland shelterbelt system built in “August 5” is quite considerable. The economic benefits of land use for 1hm2 forest network are up to 614.7 yuan, wheat yield increases 6% -12% and corn yield 6% -10% %; The ecological benefit is also considerable, the comprehensive windbreak efficiency reaches 35% ~ 40%, the soil storage water in cultivated layer increases by 7.4% and the relative humidity in air increases by 6.3%, which has the functions of winter warm summer cooling and overcoming the dry hot wind damage