广西4种珍贵树种在桉树林下间种的光合响应  

Photosynthetic responses of four precious tree species in Guangxi to intercropping under Eucalyptus plantation

作　　者：刘佳哲 余小红 樊东函 余玉珠 陈乃明 何贵整 梁刚 任世奇[4] 吕月保 LIU Jiazhe;YU Xiaohong;FAN Donghan;YU Yuzhu;CHEN Naiming;HE Guizheng;LIANG Gang;REN Shiqi;LYU Yuebao(Qinzhou Forestry Research Institute,Qinzhou 535000,Guangxi,China;Guangxi Qinlian forest farm,Qinzhou 535000,Guangxi,China;Qinzhou plant bioengineering technology research center,Qinzhou 535000,Guangxi,China;Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning 530002,Guangxi,China)

机构地区：[1]钦州市林业科学研究所,广西钦州535000 [2]广西壮族自治区国有钦廉林场,广西钦州535000 [3]钦州市植物生物工程技术研究中心,广西钦州535000 [4]广西壮族自治区林业科学研究院,广西南宁530002

出　　处：《中南林业科技大学学报》2023年第1期96-103,共8页Journal of Central South University of Forestry & Technology

基　　金：广西科技基地与人才专项“桉阔混交林生态服务功能与生产力双增培育模式研究”(桂科AD20325008);“十二五”广西林业科技项目“珍贵树种苗木培育技术推广”(桂科[2011]02号);钦州市科技项目“桉树丰产林二代萌芽林高产培育技术研究”(20118123)。

摘　　要：【目的】为提高桉树纯林的生态效益、经济效益,转变林业经济发展模式,研究桉树林下间种树种的光合差异,构建新型桉树林下间种模式。【方法】通过测定4种在桉树林下间种的珍贵树种的光响应曲线,使用直角双曲线修正模型拟合光响应曲线,对光饱和点(L_(SP))、最大净光合速率(P_(max))、光补偿点(L_(CP))、暗呼吸速率(Rd)和表观量子效应(A_(QE))进行方差和聚类分析,分析光合速率(P_(n))、气孔导度(C_(s))、胞间二氧化碳浓度(C_(i))和水分利用效率(RWUE)在光梯度下的响应。【结果】使用直角双曲线修正模型拟合的合光响应曲线效果好;香子含笑L_(SP)最高,交趾黄檀P_(max)最高,滇南风吹楠L_(SP)和P_(max)均最低,交趾黄檀L_(CP)、R_(d)和A_(QE)均最高,香子含笑L_(CP)、R_(d)最低,A_(QE)最低的为深山含笑,交趾黄檀对强光利用效率高,香子含笑与深山含笑耐阴性最好,香子含笑对不同光强的利用区间最大;C_(s)与RWUE曲线趋势随光强增加先迅速升高再趋于平缓,与光响应曲线呈正相关关系,C_(i)曲线趋势先迅速降低再趋于平缓,与光响应曲线呈负相关关系。【结论】4个树种的耐阴性依次为香子含笑>深山含笑>滇南风吹楠>交趾黄檀,幼龄间种或种植间距较大的林下可选择交趾黄檀间种;郁闭度或种植密度较高的可选择香子含笑和深山含笑间种。对比4个在桉树林下树种的光响应差异,可根据不同林龄、郁闭度、种植密度、种植环境选择适合的间种树种,以达到生态和经济效益的最大化。【Objective】In order to improve the ecological and economic benefits of Eucalyptus pure forest and change the forestry economic development model,this article characterized the photosynthetic differences of inter-species under Eucalyptus plantation and constructed a new inter-species model under Eucalyptus forest.【Method】By measuring the light response curves of four precious tree species planted under Eucalyptus plantation,fitting the light response curve with the right angle hyperbolic correction model and analyzing the light saturation point,maximum net photosynthetic rate,light compensation point,dark respiration rate and apparent quantum effect variance and clustering,the responses of photosynthetic rate,stomatal conductance,intercellular carbon dioxide and water use efficiency under light gradient were analyzed.【Result】The results showed that the fitting effect of light response curves by using the right angle hyperbola correction model was good.M.hedyosperma showed the highest L_(SP) and the lowest L_(CP) and Rd.D.cochinchinensis had the highest Pmax,L_(CP),R_(dand) A_(QE) as well as the high utilization efficiency of strong light.H.tetratepala exhibited the lowest LSPand Pmax,and M.maudiae had the lowest A_(QEM).hedyosperma and M.maudiae had the best shade tolerance,and M.hedyosperma had the largest utilization range of different light intensities.With the increase of light intensity,the trend of Csand RWUEcurve first increased rapidly and then tended to be stabilized,which was positively correlated with the light response curve.The trend of the Cicurve first decreased rapidly and then tended to be stabilized,which was negatively correlated with the light response curve.【Conclusion】The negative tolerance of the four tree species is in the order of M.hedyosperma>M.maudiae>H.tetratepala>D.cochinchinensis.Intercropping of D.cochinchinensis can be selected in the young forest or under the forest with large planting spacing.If the canopy density or planting density is high,both M.hedyosperma and

关 键 词：光响应曲线 珍贵树种 间种 桉树 光合特性 

分 类 号：S718.3[农业科学—林学]