广西望天树人工林和天然林冠层光环境特征与其生长的关系  

Light Environment Analysis of Artificial and Natural Canopy of Parashorea chinensis in Guangxi

作　　者：何鹏[1] 程飞[1] 杨梅[1] 何方中 He Peng;Cheng Fei;Yang Mei;He Fangzhong(Guangxi University,Nanning 530004,P.R.China;Nanning Arboretum)

机构地区：[1]广西大学,南宁530004 [2]南宁树木园

出　　处：《东北林业大学学报》2020年第7期29-33,共5页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31960307);广西自然科学基金项目(2018GXNSFAA28110)。

摘　　要：为了更好地保护和培育望天树(Parashorea chinensis),对广西望天树人工林(德隆、南宁树木园)与天然林(大化、百南、那里)光环境特征及其与树高、胸径之间的关系进行了分析。结果表明:(1)南宁树木园望天树林冠层叶面积指数(LAI)极显著高于德隆,大化明显低于其他地点;德隆望天树林平均叶倾角(MLA)极显著高于其他4个地点;大化望天树林透射系数(TC)显著高于其他4个地点;南宁树木园望天树林光合有效辐射(PAR)显著高于其他4个地点。(2)人工林望天树LAI、MLA和PAR均明显高于天然林相应指标,天然林望天树TC与人工林无显著差异。(3)望天树林的LAI与TC表现出强的负相关关系(R=-0.75^-0.96)。此外,南宁树木园、百南和那里的望天树林冠层MLA与PAR也呈显著正相关(R=0.68~0.80)。望天树树高与胸径表现出极强的正相关(R=0.97),树高与MLA也呈正相关(R=0.81);胸径分别与MLA(R=0.71)、PAR(R=0.68)呈现明显的正相关关系;(4)聚类分析结果表明,那里望天树天然林与南宁树木园人工林可为一类,德隆单独一类,大化与百南一类。综上所述,望天树冠层结构特征与它的生长量之间存在显著的相关性,相对于天然林,望天树人工林冠层结构特征能更有效地发挥其冠层作用,对望天树的生长发育能产生更明显的影响。In order to protect and cultivate P.chinensis,the relationship between the light environment characteristics of artificial forest(Delong,Nanning Arboretum)and natural forest(Dahua,Bainan,Nali)in Guangxi and the height and diameter of the tree was analyzed.The results show that:(1)The leaf area index(LAI)of P.chinensis forest in Nanning Arboretum is significantly higher than that of Delong,while that of Dahua is significantly lower than that of other sites.The mean leaf angle(MLA)of P.chinensis forest in Delong is significantly higher than the other four sites.The transmission coefficient(TC)of Dahua P.chinensis forest was significantly higher than that of the other four sites.The photosynthetic active radiation(PAR)of P.chinensis forest in Nanning Arboretum is significantly higher than the other four sites.(2)The P.chinensis LAI,MLA and PAR of artificial forest were all significantly higher than the corresponding indexes of natural forest,and there was no significant difference between natural forest P.chinensis TC and artificial forest.(3)LAI of P.chinensis forest showed a strongly negative correlation with TC(R=-0.75--0.96).In addition,there was a significant positive correlation between the MLA of canopy of Nanning Arboretum,Bainan and Nali and PAR(R=0.68-0.80).P.chinensis H showed a strong positive correlation with D(R=0.97),and tree height also showed a strong positive correlation with MLA(R=0.81).D showed significant positive correlation with MLA(R=0.71)and PAR(R=0.68),respectively.(4)According to the results of cluster analysis,the natural forest of Nali and the artificial forest of Nanning Arboretum can be classified into one category,Delong alone,Dahua and Bainan respectively.To sum up,there is a significant correlation between the canopy structure characteristics of P.chinensis and its growth amount.Compared with the natural forest,the canopy structure characteristics of the artificial forest can play its canopy role more effectively and have a more obvious impact on the growth and development of the P.

关 键 词：望天树 冠层光环境 叶面积指数 光合有效辐射 

分 类 号：S792.99[农业科学—林木遗传育种] S750[农业科学—林学]