论文部分内容阅读
国营阳宗海林场小白龙林区,位于宜良县境内,海拔1900—2200米。1951年以来共营造了华山松、云南松林一万多亩,均系穴状簇播,株行距1×1米,每穴保留1—6株,平均每亩500穴左右,7年以后基本郁闭成林。但是因为过密,1961年,1966年相继发生了果松球蚜和松针毒蛾的危害,使幼林遭到严重损失。
State-owned Yangzong Hailin small white dragon forest area, located in Yiliang County, 1900-2200 meters above sea level. Since 1951, a total of Huashan pine and more than 10,000 mu of Pinus yunnanensis have been established in this area. All of them are in the form of cave-shaped seed-sowing. The spacing of the trees is 1 × 1 m, and 1-6 plants per hole are reserved, with an average of about 500 acre per acre. After 7 years, Closed into the forest. However, as a result of over-denseness, the damage of young pine aphids and pine needles occurred successively in 1961 and 1966, causing serious losses to young forests.