赤水河上游次生林林窗特征及森林更新  

Forest gap characteristics and forest regeneration in the upper reaches of Chishui River

作　　者：喻阳华[1,2] 李飒[1,3] 严令斌[1] 喻理飞[4] 黄宗胜[1] 

机构地区：[1]贵州大学林学院,贵州贵阳550025 [2]仁怀市环境保护局,贵州仁怀564500 [3]贵州省植物园,贵州贵阳550004 [4]贵州大学生命科学学院,贵州贵阳550025

出　　处：《森林与环境学报》2015年第3期265-271,共7页Journal of Forest and Environment

基　　金：贵州茅台科技联合基金项目"退化植被生态功能评价及生态修复技术与示范研究"(黔科合茅科联字[2009]7007);贵州省环境保护厅项目"赤水河上游退化植被水源涵养功能评价及恢复对策"(2013-09);贵州大学人才引进项目[贵大人基合字(2013)02]

摘　　要：为研究林窗大小对幼苗更新的影响,以赤水河上游次生林中23个林窗为研究对象,分析林窗大小结构、光照强度和土壤化学性质等空间特征及其对森林更新的影响。结果表明:林分内形成的林窗以中小型为主,光照强度为林窗>林缘>林内;林窗内光照强度与林窗面积、边缘木平均胸径的相关性不显著,而与边缘木平均高之间具有极显著的指数函数关系,边缘木平均高度越低则林窗内光度值越高;土壤养分上,80-160 m2林窗较高,<80 m2林窗较低;环境综合指数上,80-160 m2林窗和>240 m2林窗较高,161-240 m2林窗和<80 m2林窗较低;植物群落优势种的幼苗在林窗内出现的频度最高。综合来看,80-160 m2的林窗较有利于森林更新,<80 m2的林窗最不利于森林更新。在森林经营时,根据需要形成合适的林窗能够保持森林的自然更新。In order to make clear the effects of gap size on seedling growth in forest,23 artificial forest gaps in the upper reaches of Chishui River were chosen as the samples to investigate the effects of gap size,light intensity,soil chemical properties on the forest regeneration. The results showed that the gap sizes in these stands were mainly small and medium,and the light intensity followed the order of gaps〉 forest edge〉 forest. The light intensity in gaps was insignificantly correlated with forest gap size and average DBH of edge trees,while following an exponential function with the average height of edge trees,where the light intensity decreased with the increasing of average height. Soil nutrients were high in the area of forest gaps between 80 m^2 and 160 m^2,and low in the area of forest gaps less than 80 m^2. Comprehensive environment indexes were relatively high in the range between 80 m^2 and 160 m^2 and the gaps larger than 240 m^2,while low in the range between 161 m^2 and 240 m^2 and the gaps smaller than 80 m^2. The seedlings of dominant plants in gaps occurred with the highest frequency. Comprehensive analysis showed the forest might be better regenerated in the gap size between 80 m^2 and 160 m^2,and the least favorable for forest regeneration was in the gao size smaller than80 m^2. It was suggested that suitable gap size should be formed in the forest management for natural regeneration.

关 键 词：次生林 林窗 空间特征 微环境特征 森林更新 赤水河上游 

分 类 号：S718.54[农业科学—林学]