黑龙江农业科学
黑龍江農業科學
흑룡강농업과학
HEILONGJINAG AGRICULTURAL SCIENCE
2011年
9期
83-86
,共4页
橡树%密度%立地因子%次生林%生长
橡樹%密度%立地因子%次生林%生長
상수%밀도%입지인자%차생림%생장
oak%density%site factor%secondary forest%grow
根据北京云蒙山林场的3块不同密度的标准地资料,分析橡树次生林不同林分密度分别与其平均胸径、平均树高、平均单木蓄积之间的关系,并建立了相应的回归方程,相关系数均在0.88以上。另根据云蒙山林场2009年二类清查资料,对20个小班采用方差分析的统计方法,利用其平均优势木四十年生时的树高,按单项立地因子实际分布区间进行分组,计算其差异显著水平,分析各立地因子对林木生长的影响。结果表明,橡树次生林密度与林分的平均胸径、林木单株蓄积之间呈负相关关系,密度对于评价林分的树高影响程度不如对胸径大;云蒙山林场四十年生橡树次生林的密度应控制在1 570株.hm-2以下;通过分析橡树次生林生长与立地因子的关系,初步确定了其适宜的立地条件为:高海拔,有效土层厚度在≥30 cm,坡度大于25°时树高生长差异不显著。
根據北京雲矇山林場的3塊不同密度的標準地資料,分析橡樹次生林不同林分密度分彆與其平均胸徑、平均樹高、平均單木蓄積之間的關繫,併建立瞭相應的迴歸方程,相關繫數均在0.88以上。另根據雲矇山林場2009年二類清查資料,對20箇小班採用方差分析的統計方法,利用其平均優勢木四十年生時的樹高,按單項立地因子實際分佈區間進行分組,計算其差異顯著水平,分析各立地因子對林木生長的影響。結果錶明,橡樹次生林密度與林分的平均胸徑、林木單株蓄積之間呈負相關關繫,密度對于評價林分的樹高影響程度不如對胸徑大;雲矇山林場四十年生橡樹次生林的密度應控製在1 570株.hm-2以下;通過分析橡樹次生林生長與立地因子的關繫,初步確定瞭其適宜的立地條件為:高海拔,有效土層厚度在≥30 cm,坡度大于25°時樹高生長差異不顯著。
근거북경운몽산림장적3괴불동밀도적표준지자료,분석상수차생림불동림분밀도분별여기평균흉경、평균수고、평균단목축적지간적관계,병건립료상응적회귀방정,상관계수균재0.88이상。령근거운몽산림장2009년이류청사자료,대20개소반채용방차분석적통계방법,이용기평균우세목사십년생시적수고,안단항입지인자실제분포구간진행분조,계산기차이현저수평,분석각입지인자대림목생장적영향。결과표명,상수차생림밀도여림분적평균흉경、림목단주축적지간정부상관관계,밀도대우평개림분적수고영향정도불여대흉경대;운몽산림장사십년생상수차생림적밀도응공제재1 570주.hm-2이하;통과분석상수차생림생장여입지인자적관계,초보학정료기괄의적입지조건위:고해발,유효토층후도재≥30 cm,파도대우25°시수고생장차이불현저。
Based on the data of 3 stand sites of oak secondary forest in Miyun county Beijing,the relationship a mong its different forest density respectively with its DBH, the average tree height, single-tree volume,and the regression equations were established, the relevant coefficients were all above 0.88. Based on 20 stand sites of 2009 forest resource inventory data in Miyun county, using its dominant height of forty-year-old secondary forest, the actual distribution area of single site factor was divided into groups to obtain the changing regularity of each factor by variance analysis. The results showed that oak secondary density and its DBH, single-tree volume has negative correlation,while for the average tree height, the influence was not so apparent. Densities of oak secondary should be controlled below 1 570 trees,hm 2. The suitable site factors for oak secondary were initially determined as follows:high altitude,the thickness of effective soil layer more than 30 cm,slope more than 25%, on the conditions, it has no significant difference for tree height growth.