不同混交模式下降香黄檀人工林树冠结构与黑痣病发生关系的研究  

Relationship between the crown structure of Dalbergia odorifera plantations and the occurrence of Phyllachora dalbergiicolain different mixed patterns

作　　者：王晓曦[1] 周国英[1,2] 何苑皞[1,2] 苏圣淞 李小敏[1,2] 刘君昂[1,2] 

机构地区：[1]中南林业科技大学经济林培育与保护教育部重点实验室,长沙410004 [2]中南林业科技大学森林有害生物防控湖南省重点实验室,长沙410004

出　　处：《中国森林病虫》2016年第4期12-16,7,共6页Forest Pest and Disease

基　　金：国家林业公益性行业科研专项(No.201304402)

摘　　要：调查不同混交模式下降香黄檀树冠结构指标和黑痣病发病情况,分析树冠结构指标和黑痣病的关系,筛选出防控黑痣病的主要树冠结构指标。结果如下:降香黄檀黑痣病病情指数与枝下高(Hub)、叶面积指数(LAI)呈显著正相关性,与冠长树高比(PLCH)、冠幅(W)、树冠表面积(CSA)、单株叶面积总数(TLA)呈极显著负相关,一级分枝粗度(Dfb)、一级分枝角度(Afb)、冠形率(CSR)、冠层密度(CLD)与病情指数相关性不显著;树冠表面积(CSA)与病情指数相关系数最大。通径分析表明各树冠结构指标对病情指数直接作用结果如下:正向作用程度从大到小顺序为LAI、W、CSR、Dfb、Afb;负向作用程度从大到小顺序为PLCH、CLD、CSA、TLA、Hub。由决策系数可得,对黑痣病有防控作用的各树冠结构指标从大到小顺序为CLD、PLCH、LAI、Hub、W、TLA、CSR、CSA、Dfb、Afb。综合分析可得,PLCH和W对黑痣病的相对重要性适中,与病情指数呈显著负相关,与混交模式呈极显著正相关,所以选取PLCH和W作为黑痣病生态调控的主要树冠结构指标。The relationship between the crown structure index of Dalbergia odorifera and the occurrence of Phyllachora dalbergiicola was analyzed and several effective indexes for controlling the disease were selected.The results showed that the disease index of Phyllachora dalbergiicola had highly significant positive correlation with height under branch（Hub）and leaf area index（LAI）,but the highly significant negative correlation with crown length/tree height ratio（PLCH）,crown width（W）,crown surface area（CSA）,total plant leaf area（TLA）,and it had no significant correlation with first-grade branch diameter（Dfb）,first-grade branch angle（Afb）,crown shape ratio（CSR）,crown layer density（CLD）.Crown surface area（CSA）had the maximum correlation coefficient to the disease index.The path analysis showed the positive effect of each crown structure index on disease followed from high to low was LAI、W、CSR、Dfb、Afb.and negative effect was PLCH、CLD、CSA、TLA、Hub.Based on the decision-making coefficient the effect of crown structure indexes in the control of the disease were CLD,PLCH,LAI,Hub,W,TLA,CSR,CSA,Dfb,Afbfrom high to low.According to comprehensive analysis,crown length/tree height ratio（PLCH）and crown width（W）displayed significant negative correlation with the disease index and the highly significant positive correlation with the mixed pattern,so PLCHand W were selected as the crown structure indexes for ecological control of Phyllachora dalbergiicola.

关 键 词：降香黄檀 树冠结构 黑痣病 病情指数 相关性 生态控制 

分 类 号：S763.15[农业科学—森林保护学]