不同造林密度对油用柠檬桉光合特性的影响  

Effects of Different Planting Densities on Photosynthetic Characteristics of Eucalyptus citriodora

作　　者：贺旺龙 周丽珠[2] 谷瑶[2] 袁德义[3] 杨漓[2] HE Wang-long;ZHOU Li-zhu;GU Yao(Guangxi Gaofeng State Owned Forest Farm,Nanning,Guangxi 530002;Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning,Guangxi 530002)

机构地区：[1]广西壮族自治区国有高峰林场,广西南宁530002 [2]广西壮族自治区林业科学研究院,广西南宁530002 [3]中南林业科技大学,湖南长沙410004

出　　处：《安徽农业科学》2021年第1期98-101,105,共5页Journal of Anhui Agricultural Sciences

基　　金：防城港市科学研究与技术开发计划项目(防科AB19008012);广西林业科技推广示范项目(gl2020kt10);百色市科学技术开发项目(百科20184735);广西林业科学研究院基本科研业务费专项(林科201818)。

摘　　要：分析在4个密度下[D1(0.7 m×0.8 m,17800株/hm 2)、D2(1.0 m×1.0 m,10000株/hm 2)、D3(1.0 m×1.5 m,6660株/hm 2)、D4(2.0 m×3.0 m,1650株/hm 2)]柠檬桉光合特性。结果表明:柠檬桉光饱和点为1636.56~1963.81μmol/(m 2·s),密度D3的光饱和点最高,D1的光饱和点最低;光补偿点为43.32~66.25μmol/(m 2·s),密度D3的光补偿点最高,D1的光补偿点最低;表观量子效率为0.0563~0.0689,不同密度间差异不显著;最大净光合速率为16.88~24.82μmol/(m 2·s),密度D3的最大净光合速率最高,D1的最大净光合速率最低;暗呼吸速率为1.63~2.56μmol/(m 2·s),密度D3的暗呼吸速率最高,D1的暗呼吸速率最低。密度D3最大净光合速率高,适应强光能力高,利用弱光能力低,表观量子效率高,暗呼吸速率高。Photosynthetic characteristics of Eucalyptus citriodora under different planting densities,such as D1(0.7 m×0.8 m,17800 plants/hm 2),D2(1.0 m×1.0 m,10000 plants/hm 2),D3(1.0 m×1.5 m,6660 plants/hm 2)and D4(2.0 m×3.0 m,1650 plants/hm 2)were studied.The light saturation point of E.citriodora was 1636.56-1963.81μmol/(m 2·s).The light saturation point of density D3 was the highest among those four planting densities,while that of D1 was the lowest.The light compensation point of density D3 was 43.32-66.25μmol/(m 2·s).The light compensation point of density D3 was the highest,while that of D1 was the lowest.The apparent quantum efficiency of E.citriodora was 0.0563-0.0689,and the difference among different densities was not significant.The maximum net photosynthetic rate was 16.88-24.82μmol/(m 2·s),the maximum net photosynthetic rate of density D3 was the highest,and that of D1 was the lowest.Dark respiration rate was between 1.63-2.56μmol/(m 2·s),density D3 had the highest dark respiration rate and D1 had the lowest dark respiration rate.It was concluded that E.citriodora under D3 density had higher net photosynthetic rate,high adaptability to strong light,low utilization ability of weak light,and high apparent quantum efficiency,while E.citriodora under D3 density had low dark respiration rate.

关 键 词：柠檬桉 净光合速率 光补偿点 光饱和点 

分 类 号：S792.39[农业科学—林木遗传育种]