西南林业大学学报
西南林業大學學報
서남임업대학학보
JOURNAL OF SOUTHWEST FORESTRY COLLEGE
2014年
6期
16-23
,共8页
王晓荣%刘学全%唐万鹏%庞宏东%郑京津
王曉榮%劉學全%唐萬鵬%龐宏東%鄭京津
왕효영%류학전%당만붕%방굉동%정경진
马尾松%人工林%调控密度%林分特征%自然更新%物种多样性%丹江口湖北库区
馬尾鬆%人工林%調控密度%林分特徵%自然更新%物種多樣性%丹江口湖北庫區
마미송%인공림%조공밀도%림분특정%자연경신%물충다양성%단강구호북고구
Pinus massoniana%plantation%regulation density%stand features%natural regeneration%species diversity%Danjiangkou reservoir area of Hubei Province
以丹江口湖北库区马尾松人工林为研究对象,从林分结构、天然更新演替和生物多样性等方面探讨不同调控密度的林分特征。结果表明,林分密度的降低有利于乔木层平均树高、平均胸径、优势高、枝下高的明显增加,不同调控密度林分高度分布整体均呈现正态分布曲线,但不同密度林分其峰值波动范围的宽窄程度各不相同,低密度林分高度结构更趋于完整;高密度林分立木胸径以小径阶为主,低中密度林分大径阶立木数量则明显增加。高中低密度马尾松林下更新树种种类分别为5种、7种和8种,均以栓皮栎和盐肤木构成其优势更新树种;随着林分密度的增加,更新幼苗数量以及更新层优势种幼树幼苗与乔木树种数量之比均表现为逐渐降低趋势,且更新幼苗多集中在高度≥50 cm范围。马尾松林分密度的降低均在一定程度上促进林下生物多样性的增加,但不同层次生物多样性变化趋势存在差异。
以丹江口湖北庫區馬尾鬆人工林為研究對象,從林分結構、天然更新縯替和生物多樣性等方麵探討不同調控密度的林分特徵。結果錶明,林分密度的降低有利于喬木層平均樹高、平均胸徑、優勢高、枝下高的明顯增加,不同調控密度林分高度分佈整體均呈現正態分佈麯線,但不同密度林分其峰值波動範圍的寬窄程度各不相同,低密度林分高度結構更趨于完整;高密度林分立木胸徑以小徑階為主,低中密度林分大徑階立木數量則明顯增加。高中低密度馬尾鬆林下更新樹種種類分彆為5種、7種和8種,均以栓皮櫟和鹽膚木構成其優勢更新樹種;隨著林分密度的增加,更新幼苗數量以及更新層優勢種幼樹幼苗與喬木樹種數量之比均錶現為逐漸降低趨勢,且更新幼苗多集中在高度≥50 cm範圍。馬尾鬆林分密度的降低均在一定程度上促進林下生物多樣性的增加,但不同層次生物多樣性變化趨勢存在差異。
이단강구호북고구마미송인공림위연구대상,종림분결구、천연경신연체화생물다양성등방면탐토불동조공밀도적림분특정。결과표명,림분밀도적강저유리우교목층평균수고、평균흉경、우세고、지하고적명현증가,불동조공밀도림분고도분포정체균정현정태분포곡선,단불동밀도림분기봉치파동범위적관착정도각불상동,저밀도림분고도결구경추우완정;고밀도림분립목흉경이소경계위주,저중밀도림분대경계립목수량칙명현증가。고중저밀도마미송림하경신수충충류분별위5충、7충화8충,균이전피력화염부목구성기우세경신수충;수착림분밀도적증가,경신유묘수량이급경신층우세충유수유묘여교목수충수량지비균표현위축점강저추세,차경신유묘다집중재고도≥50 cm범위。마미송림분밀도적강저균재일정정도상촉진림하생물다양성적증가,단불동층차생물다양성변화추세존재차이。
A Pinus massoniana plantation of Danjiangkou reservoir of Hubei Province was selected as object to analyze the stand features under different regulation density from three respects of the stand structure,natural re-generation status and biodiversity.The results showed that average tree height,average DBH,dominant height,and under branch height were significantly increased with the stand density decreased.At the same time,the height dis-tribution in three densities of Pinus massoniana plantation all showed a normal distribution curve,but the stand height structure at low density tended to be more complete.In high density stand,small diameter class trees were main components,but in low-medium density stand,the number of larger diameter tree was increased significantly. The number of regeneration species under forest of high density,medium density and low density P.massoniana were 5,7 and 8,respectively,and the dominant regeneration species were Quercus variabilis and Rhus chinensis. With the stand density increased,the number of regeneration seedlings,the ratio of saplings and seedlings to domi-nant trees gradually decreased.The seeding characteristic was more concentrated in height≥50 cm,and the stand was lack of low age old seedlings.The density decrease of Pinus massoniana stand promoted the increase of biologi-cal diversity of understory vegetation in some extent,but there were some differences on the variation trends of bio-logical diversity between different layers.