摘要
【目的】分析喀斯特石漠化地区枇杷的冠层结构特征,为经济果林种植与管理提供科学依据。【方法】采用CI-110植物冠层分析仪测定石漠化地区种植枇杷树的冠层光合有效辐射(PAR)、叶面积指数和散射辐射透过系数,计算PAR透过率、消光系数(K)和林分空隙度,并对冠层结构各参数进行相关性分析。【结果】枇杷冠层的平均林分空隙度、PAR、叶面积指数、叶倾角和散射透过系数分别为0.241、38.245[mol/(m2·d)]、1.648、10.197°和0.228,其中林分空隙度与叶面积指数和PAR呈极显著相关(P<0.01,下同),相关系数分别为-0.852和0.852,散射辐射透过系数与PAR呈极显著正相关,相关系数为0.872,说明林分空隙度、叶面积指数和散射辐射透过系数对枇杷的光截获能力具有较大影响;平均叶倾角与林分空隙度、PAR、散射辐射透过系数和叶面积指数等参数无显著相关性(P>0.05);K和PAR透过率的最小值分别为0.697和0.070%,说明枇杷冠层的光截获能力较强。【结论】喀斯特石漠化地区枇杷冠层内光能利用与光照情况主要受冠层结构特征的深度影响,冠层对光的截获能力较强,生产中应对枇杷冠层结构进行适当修剪调整。
【Objective】Through analyzing the characteristics of loquat canopy structure in karst rocky desertification area,scientific evidences could be provided for the planting and management of commercial fruit forests.【Method】The photosynthetic active radiation(PAR),leaf area index,and transmission coefficient for defuse penetration of the loquat canopy in the rocky desertification area were measured by CI-110 analyzer of plant canopy,and the transmission rate of PAR,extinction coefficient(K),and stands openness were calculated,then correlations among various parameters of canopy structure were analyzed.【Result】The average stands openness,PAR,leaf area index,leaf angle and transmission coefficient for defuse penetration of loquat canopy were 0.241,38.245[mol/(m2·d)],1.648,10.197°and 0.228.There was extremely significant correlation(P<0.01,the same below)between stands openness and leaf area index,stands openness and PAR,and the correlation coefficients were-0.852 and 0.852 respectively.In addition,transmission coefficient for defuse penetration and PAR were of extremely significant positive correlation,with a coefficient of 0.872.These showed that stands openness,leaf area index and transmission coefficient for defuse penetration had great influence on the light capture ability of loquat trees.Mean leaf angle had no significant correlation with stands openness,PAR,transmission coefficient for defuse penetration and leaf area index(P>0.05).The minimums of K and transmission rate of PAR were 0.697 and 0.070%respectively,which showed that the light capture ability of loquat canopy was high.【Conclusion】The utilization of light energy and the received illumination conditions of the canopy of loquat in karst rocky desertification area are deeply and mainly affected by the structure characteristics of the canopy.Moreover,the light capture ability of the canopy of loquat is strong,thus it is needed to prune the canopy properly.
作者
谭代军
熊康宁
张俞
许敏
程雯
全明英
赖佳丽
TAN Dai-jun;XIONG Kang-ning;ZHANG Yu;XU Min;CHENG Wen;QUAN Ming-ying;LAI Jia-li(School of Karst Science,Guizhou Normal University/State Engineering Technology Institute for Karst Desertification Control,Guiyang 550001,China)
出处
《南方农业学报》
CAS
CSCD
北大核心
2018年第9期1753-1759,共7页
Journal of Southern Agriculture
基金
贵州省科技计划重大专项项目(黔科合重大专项字[2014]6007号)
贵州省研究生教育创新计划项目(黔教研合GZS字[2016]04号)
贵州省研究生科研基金项目(KYJJ2017004)
关键词
枇杷
喀斯特
石漠化地区
冠层结构特征
林内光照
叶面积指数
loquat
karst
rocky desertification area
canopy structure characteristics
illumination conditions in forests
leaf area index
