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苏北沿海位于东经119°～122°,北纬39°37’～35°之间.南自启东,北至赣榆,海岸线长1039公里,面积约为1600多万亩,地势平坦,气侯温暖,雨量充沛,是国家重要的产棉区.但是,由于地形和季风的影响,台风、干旱、寒流,特别是倒春寒等气象灾害常有发生,威胁着粮、棉的稳产高产.为了战胜气象灾害,确保粮棉丰收,解放后,在党和政府的领导下,沿海人民植树造林,营造护田林带,作出了巨大的努力.目前,这一地区的平原绿化正在向着农田林网化的方向发展.所以,对农田林网的防护效应进行研究就显得非常重要.1980年,我们对东台县五七公社东海大队四队的农田林网进行了实地观测,现初报如下:
The coast of the northern Jiangsu lies between 119 ° ~ 122 ° E and 39 ° 37 ’~ 35 ° N. It runs from Qidong to the north and Ganyu to the north, with a coastline length of 1039 km and an area of about 16 million mu, with flat terrain and warm climate However, due to the influence of topography and monsoon, meteorological disasters such as typhoon, drought and cold current, especially in late spring are threatening the steady and high yield of grain and cotton.In order to overcome the meteorological disasters , To ensure a good harvest of grain and cotton, and after the liberation, under the leadership of the party and the government, people in the coastal areas have made afforestation and afforestation, and made tremendous efforts. At present, plains and greening in this area are moving toward the network of farmland forests Therefore, it is very important to study the protective effect of farmland shelterbelts.In 1980, we conducted field surveys on the farmland shelterbelts of the four teams of Donghai Brigade,