秦岭南坡中山地带“雨淞+湿雪”对华北落叶松人工林危害规律的探讨  

Impact of "Glaze+Wet Snow" on Larix principis-rupprechtii Plantation at Middle Zone of South-facing Slope of the Qinling Mountains

作　　者：陈海滨[1] 雷瑞德[1] 尚廉斌[1] 相维宽 

机构地区：[1]西北林学院森林资源保护系,陕西杨陵712100 [2]陕西省森林工业总公司,西安710082

出　　处：《西北林学院学报》1996年第S1期151-156,共6页Journal of Northwest Forestry University

摘　　要：1992年3月20日，秦岭南坡中山地带旬阳坝林区部分华北落叶松人工林遭受“雨淞＋湿雪”的严重危害，局部地段受害率达80％以上。受害情况与林木的高径比有关，受害本主要是中小径木，平均高径比为117，未受害木平均高径比为96。雪折的高度随林木胸径增大而升高，与林木高径比呈负相关关系。阳坡林分受害较轻，阴坡较重。及时间伐，促使林木保特合理的高径比（＜100）是减免风、雪等灾害的重要措施之一。Partial Larix principis-rupprechtii plantation at Xunyangba forest region in middle zone of south - facing slope of the Qinling Mountains was seriously damaged by 'glaze+wet snown on March 20, 1992, the damage in some stands was more than 80%. The damage was related to the height and dbh of the trees, most of the damaged trees were small diameter tim-bers, the average ratio of dbh to height of those trees was 117 and that of normal trees was 96.The height of damage increased with the dbh but decreased with the ratio of height to dbh of trees. The damage on north-facing slope was more serious than that on south slope. Thinning in time to maintain rational ratios (<100) of height to dbh of trees was one of important mea-sures to reduce the damage by wind and snow.

关 键 词：落叶松 雪淞 雪倒 雪折 

分 类 号：S761[农业科学—森林保护学]