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辽阳县小北河镇从1983年到1985年,共栽植杨树速生丰产林3350亩。由于采取集约经营,科学管理,林木生长发育良好,已形成了完整的林相。据1990年调查,8年生沙兰杨平均高为16米,平均胸径21厘米,平均单株材积0.27米~3,平均亩蓄积达到9.44米~3。取得了较好的生态、社会和经济效益。 1.生态效益 这个镇的沙兰杨丰产林绝大部分栽植在治河大堤的迎水坡坝上,成带状分布,最宽的60米,最窄的30米。目前树高均在
Xiaobeihe, Liaoyang County from 1983 to 1985, a total of 3350 acres of planted poplar fast-growing forest. As a result of intensive management, scientific management, good growth and development of trees, has formed a complete forest facies. According to the survey in 1990, the average annual height of 8-year-old Salvinia was 16 meters with an average diameter at breast height of 21 centimeters and an average single plant volume of 0.27 to 3 with an average of 9.44 to 3 acres per mu. Achieved good ecological, social and economic benefits. 1. Ecological benefits The town of Sallam Yang Feng Lin vast majority of planting forests in the embankment Ying Ying slope dam, into a zonal distribution, the widest 60 meters, the narrowest of 30 meters. The current tree height are in