论文部分内容阅读
连城林区地处祁连山东麓,永登县境西部。南与青海省乐都县下北山林区接壤,西与青海省互助土族自治县上北山林区毗邻,北与我省的天祝藏族自治县古城林区相连。总面积477.78平方公里。一般海拔2200～3300米,最高3616米。年降雨量416.6毫米,相对湿度62％,年平均气温6.5～7℃。主要乔灌木植物有云杉、油松、山杨、桦类、蔷薇、小蘖、花楸、栒子等300多种。森林覆盖率48.3％。是我国冷温带半干旱区的典型天然次生林区。为初步掌握该林区主要树种的害虫种类,在1981年病虫普查基础上,通过定点灯诱采集
Liancheng forest is located in the eastern foot of the Qilian Mountains, western Yongding County. It is bordered by Xiabeishan Forest District in Ledu County of Qinghai Province and adjacent to Shangbeishan Forest District of Huzu Tu Autonomous County in Qinghai Province. It is linked with the ancient city forest area of Tianzhu Tibetan Autonomous County in the north. The total area of 477.78 square kilometers. The general elevation of 2200 ~ 3300 meters, the highest 3616 meters. The annual rainfall of 416.6 mm, 62% relative humidity, the annual average temperature of 6.5 ~ 7 ℃. The main shrubs and plants spruce, Pinus tabulaeformis, aspen, birch, rose, small tiller, Sorbus, prickly heat and other 300 kinds. Forest coverage rate of 48.3%. It is a typical natural secondary forest area in the cold temperate semi-arid area in China. In order to preliminary grasp the pest species of the main tree species in this forest area, on the basis of the survey of pests and diseases in 1981,