檫、栎混交林主要树种种群55a的动态变化  

Population Dynamic of Dominant Species of Sassafras tzumu and Koakaza chenii Mixed Forest in Past 55 Years

作　　者：王良衍 杨庆松[2,3] 费希旸 沙存龙 

机构地区：[1]浙江天童国家森林公园,浙江宁波315114 [2]华东师范大学生态与环境科学学院,上海200241 [3]浙江天童森林生态系统国家野外科学观测研究站,浙江宁波315114 [4]鄞州区林业技术管理服务站,浙江宁波315100

出　　处：《福建林业科技》2016年第2期27-31,共5页Journal of Fujian Forestry Science and Technology

基　　金：宁波市重大项目(2013C11034);宁波市鄞州区科技局项目(稳定高效型中幼林的群落功能模式调控技术)

摘　　要：对宁波天童林场双峰山檫木、小叶栎混交林主要树种种群55 a的数量特征、径级结构、生长规律和优势木生长特征等进行研究。结果表明:檫、栎混交林胸径大于5 cm的成树密度在1973、1990、2015年3次调查中呈逐年递减趋势,这种降低主要是檫木个体死亡造成的;而林木总胸径断面积和林分蓄积量呈逐年增加趋势,主要是栎木和其它存活个体生长的结果。从1973—2015年,檫木种群的优势度由大变小,其径级结构已为间断的单峰衰退曲线;栎木种群则由小变大,径级结构呈间歇型,已产生2代更新。树种生长规律分析显示,檫木幼林速生持续期短、生长量低、衰老早、立木蓄积量低;栎木表现幼林速生持续期长、生长量大,干材连年生长量大、时间长、蓄积量大。优势木特征分析表明,近熟人工混交林中,占总数20.9%的大径级栎木已提供了84.5%的蓄积量。从森林经营的角度看,栎木不仅是一个适生的优良造林树种,且可培育大径木。This study analyzed the quantitative characters ,diameter structure, overall and dominant trees＇ growth dynamic of the Sassafras tzumu and Quercus chenii mixed forest in past 55 years at Shuangfeng Mountain in Tiantong forest farm, Ningbo. Results indicate that the adult tree （DBH 〉 5 cm） density of the forest showed a decline trend from 1973 to 2015, mainly caused by the individual death of S. tzumu, while the stand volume and total basal area of the forest are ascending, considerably attributing to the growth of the survivors such as Q. chenii. From 1973 to 2015 ,the dominance of the S. tzumu community was reduced and its size-class revealed a deteriorative-discrete unimodal distribution, while the dominance of Q. chenii expanded and its size-class revealed a muhimodel distribution, reflecting a well generation renewal. The growth dynamic suggest that young stands of S. tzumu have a shorter fast-growing duration, a smaller increment, an earlier aging, and a lower stand volume, while those individuals of Q. chenii have a longer fast-growing duration, a bigger increment, a greater and longer annual growth of bole, and a lower stand volume. Growth dynamic of dominant trees show that large-diameter Q. chenii individuals, covering 20. 9% of the total amount of individuals in near-mature artificial mixed forest, have provided 84. 5% of the stand volume. In term of forest management, Q. chenii is satisfactory species not only for afforestation, but for being fostered for large-diameter tree as well.

关 键 词：檫木 小叶栎 人工混交林 数量特征 径级结构 生长规律 

分 类 号：S718.54[农业科学—林学] S725.2