防护林科技
防護林科技
방호림과기
PROTECTION FOREST SCIENCE AND TECHNOLOGY
2015年
4期
29-32
,共4页
辽东山区%次生林%生态多样性%人工林%径阶%分布格局
遼東山區%次生林%生態多樣性%人工林%徑階%分佈格跼
료동산구%차생림%생태다양성%인공림%경계%분포격국
eastern mountains of Liaoning Province%secondary forest%ecological diversity%plantation%diameter class%distribution pattern
依据辽东山区典型样地的调查数据,对辽东山区次生林生物多样性及不同林型径阶分布格局进行了研究,结果表明,辽东山区次生林多样性指数(Shannon-Wiener)为2.7451,生态优势度(Simpson)为0.2870,群落均匀度指数(Pielou)为0.9497。次生林主要优势种群的径阶分布属小径阶聚集型,2 cm、4 cm、6 cm径阶株数分别为129、285和397株,在1~20 cm径阶区间呈连续型径阶分布。针阔混交林径阶分布相对于次生林而言,大径阶有明显提高,小径阶虽然有较大的分布趋势,但在2 cm小径阶处陡然下降,曲线趋于平缓,这说明针阔混交林的乔木层立木胸径径阶生长量竞争不明显。人工针叶林的胸径生长量在18~28 cm径阶范围分布较高,在22 cm达到最大值,说明在此区间分布的径阶株数最多。在大于28 cm径阶时,曲线趋于下降,表明人工针叶林较之次生林和针阔混交林在大径阶分布的株数上比较集中。虽然人工林能够集中收获较大径阶的材积量,但人工林由于更新功能很差,生态功能较弱。
依據遼東山區典型樣地的調查數據,對遼東山區次生林生物多樣性及不同林型徑階分佈格跼進行瞭研究,結果錶明,遼東山區次生林多樣性指數(Shannon-Wiener)為2.7451,生態優勢度(Simpson)為0.2870,群落均勻度指數(Pielou)為0.9497。次生林主要優勢種群的徑階分佈屬小徑階聚集型,2 cm、4 cm、6 cm徑階株數分彆為129、285和397株,在1~20 cm徑階區間呈連續型徑階分佈。針闊混交林徑階分佈相對于次生林而言,大徑階有明顯提高,小徑階雖然有較大的分佈趨勢,但在2 cm小徑階處陡然下降,麯線趨于平緩,這說明針闊混交林的喬木層立木胸徑徑階生長量競爭不明顯。人工針葉林的胸徑生長量在18~28 cm徑階範圍分佈較高,在22 cm達到最大值,說明在此區間分佈的徑階株數最多。在大于28 cm徑階時,麯線趨于下降,錶明人工針葉林較之次生林和針闊混交林在大徑階分佈的株數上比較集中。雖然人工林能夠集中收穫較大徑階的材積量,但人工林由于更新功能很差,生態功能較弱。
의거료동산구전형양지적조사수거,대료동산구차생림생물다양성급불동림형경계분포격국진행료연구,결과표명,료동산구차생림다양성지수(Shannon-Wiener)위2.7451,생태우세도(Simpson)위0.2870,군락균균도지수(Pielou)위0.9497。차생림주요우세충군적경계분포속소경계취집형,2 cm、4 cm、6 cm경계주수분별위129、285화397주,재1~20 cm경계구간정련속형경계분포。침활혼교림경계분포상대우차생림이언,대경계유명현제고,소경계수연유교대적분포추세,단재2 cm소경계처두연하강,곡선추우평완,저설명침활혼교림적교목층립목흉경경계생장량경쟁불명현。인공침협림적흉경생장량재18~28 cm경계범위분포교고,재22 cm체도최대치,설명재차구간분포적경계주수최다。재대우28 cm경계시,곡선추우하강,표명인공침협림교지차생림화침활혼교림재대경계분포적주수상비교집중。수연인공림능구집중수획교대경계적재적량,단인공림유우경신공능흔차,생태공능교약。
According to survey data of typical plots in eastern mountains of Liaoning Province ,distribution patterns of diameter class of different forest types and biodiversity of secondary forest were studied .Result shows that the diversity index of secondary forest (Shannon‐Wiener) in eastern mountains of Liaoning Province is 2 .745 1 ,the eco‐logical dominance (Simpson) being 0 .287 0 ,evenness index of communities (Pielou) being 0 .949 7 .Diameter class of the dominant populations for secondary forest belongs to aggregated small diameter class .The number of trees with the diameter class being 2 cm ,4 cm ,6 cm are 129 ,285 and 397 .It appears continuous diameter class distribu‐tion in the range of 1‐20 cm diameter class interval .Compared diameter class distribution between coniferous broad‐leaved mixed forest and secondary forest ,the large diameter class improve significantly ;the small diameter class have trend of larger distribution ,but drop sharply in small diameter class at 2 cm ;curve tends to flatten;it indicates that competition of the yield of diameter class of DBH for tree layer of coniferous and broad‐leaved mixed forest is not obvious .The distribution of DBH growth for artificial coniferous forest in the range of 18‐28 cm are higher ,being the largest at 22 cm ,which indicates that number of diameter class distributed in this interval are the largest .Grea‐ter than 28 cm ,the diameter class curve tends to decrease ,indicating that artificial coniferous forest concentrated on large‐diameter distribution of the number of trees than secondary forest and coniferous and broad‐leaved mixed for‐est .Plantations can concentrate harvest timber volume with larger diameter class ;the ecological function of planta‐tions is weak because of its poor regeneration function .