林业科学2012，Vol.48Issue(7)：1-7,7.
宁夏六盘山华北落叶松人工林雪害的影响因子
Factors Affecting the Snow Caused Damage of Larix principis-rupprechtii Plantation in Liupan Mountains of Ningxia, Northwest China
摘要
Abstract
In this paper we investigated damage caused by a rare early-snow event at late autumn in 2011 on the Larix principis-rupprechtii plantation of the Liupan Mountains, Ningxia of Northwest China. The relationships between the stand damage rate, site conditions and stand structure were analyzed. It was found that the damage rate was significantly higher in the stands on the sites with high-altitude, wind-exposure and thin soil thickness. The damage rate of high-density stands was apparently higher than that of the low-density stands, which illustrates that the stand density is an important stand structure indicator that affects its ability against snow damage. However, the direct affecting factor should be the higher H/DBH (the ratio of tree height to the diameter at breast height) caused by the high stand density. When H/DBH was 0. 7 -0. 9, the stand might suffer from snow damage, but the increasing range of the damage rate with increasing H/DBH was slight. When H/DBH was higher than 0.9, the stand damage rate increased rapidly with increasing H/DBH. When H/DBH was higher than 1.0, the stand damage rate increased very rapidly with increasing H/DBH. Therefore, reducing the stand density to lower the stand H/DBH to around 0.7 through a timely thinning, and then maintaining it within 0.9 would be a feasible silvicultural measure to improve the forest ability against snow damage.关键词
雪害/华北落叶松/高径比/受害率/六盘山Key words
snow damage/ Larix principis-rupprechtii/ the ratio of tree height to DBH/ damage rate/ Liupan Mountains分类
农业科技引用本文复制引用
郝佳,熊伟,王彦辉,于澎涛,王艳兵,张军,余治家..宁夏六盘山华北落叶松人工林雪害的影响因子[J].林业科学,2012,48(7):1-7,7.基金项目
林业公益性行业科研专项(200904005、200904056、201104005)、"十二五"国家科技计划课题(2011BAD38B0503)、国家自然科学基金项目(41071023)、中国森林生态系统定位研究网络(CFERN)宁夏六盘山森林生态定位站和国家林业局森林生态环境重点实验室资助. （200904005、200904056、201104005）
