论文部分内容阅读
六盘山位于我区最南端,是三个天然次生林区之一.海拔1700~2900米,年平均气温7℃,无霜期90~120天,年降雨量450~700毫米,多集中在七、八、九月.气候有春寒、夏旱、秋涝、冬干的特点.林区总面积160多万亩,其中有林地约40万亩,林木总蓄积最80多万立方米.大多为解放后封护起
Liupanshan is located in the southernmost part of our region, is one of three natural secondary forests.It has an elevation of 1700 ~ 2900 meters, annual average temperature 7 ℃, frost-free period 90 ~ 120 days, annual rainfall 450 ~ 700 mm, mostly concentrated in seven, eight, In September, the climate has the characteristics of cold spring, summer drought, autumn flood and winter stem.The total area of the forest area is more than 1.6 million mu, of which there are about 400,000 mu of forest land and the total volume of forest trees is more than 800,000 cubic meters. Care from