新沂县地处苏鲁交界,陇海铁路东段。总面积约1530平方公里。地势由东向西缓缓倾斜,海拔高55米,以低山岗岭地为主,西部较低,高24米,是沂沭河中游冲积平原。全县按地形、水利条件大致分为沿湖区、沿河区、丘陵区。前两个区,土壤为河淤土、黄土、两合土、黑土、砂土,土质肥沃,水源充足,是农业高产区。后一区,土壤为包浆土、砂土、黑岗土,土层浅而贫瘠,水利基础差,农业产量长期低而不稳。为了迅速改变这种局面,从1970年以来,我们大搞了农田水利基本建设,并利用开挖的沟渠路植树造林,新建农田林网87万亩,使原来比较落后的岗岭地区的自然面貌有了显著地变化,农业生产有了很大的提高。但在建设农田林网化这一工作中,对于立地条件差的岗岭地区如何搞好树种的选择,尚缺乏经验, Xinyi County is located at the junction of Sulu, Longhai Railway eastern section. The total area of ​​about 1530 square kilometers. The terrain slowly slopes from east to west, 55 meters above sea level, mainly in the low mountain ridge, the lower reaches of the west, 24 meters high, is the alluvial plain in the middle Yishu River. The county according to the terrain, water conditions are roughly divided into Lakes along the river, hilly areas. The first two areas, the soil for the river silt, loess, two loess, black soil, sand, fertile soil, adequate water, is a high-yield area of ​​agriculture. In the latter area, the soil is overcrop soil, sand and black hill soil, soil is light and barren, water foundation is poor, and agricultural output is low and unstable for a long time. In order to rapidly change this situation, since 1970, we have vigorously started the construction of farmland and water conservancy projects and used ditches and ditches of excavated trees for afforestation to build an area of ​​870,000 mu of farmland and forest land so that the original backward nature of the Kongling area With significant changes, agricultural production has greatly improved. However, in the process of building farmland network, there is still a lack of experience on how to do a good job in tree species selection in Gangling with poor site conditions.