4种油松混交灌木树种的耐阴性研究  

Research on the shade tolerance of 4 shrub tree species mixed with Chinese pine

作　　者：林阳[1] 王世忠[1] 

机构地区：[1]辽宁省干旱地区造林研究所,辽宁朝阳122000

出　　处：《河北林果研究》2014年第3期258-262,共5页Hebei Journal of Forestry and Orchard Research

基　　金：国家林业局林业公益性行业科研专项经费项目"辽西北油松生态公益林结构调控关键技术研究"(201304224)

摘　　要：为探讨油松混交灌木树种的耐阴性,通过设置不同程度的遮阴处理,对柠条、紫穗槐、荆条、沙棘等4个辽西地区常见的油松混交灌木树种的叶绿素含量及光响应曲线参数进行了测定。研究结果表明,不同树种间叶绿素a/b值差异不显著,不同遮阴处理间差异极显著。4个灌木树种随着遮阴强度的增大,其叶片叶绿素a/b值均表现出波浪式的变化趋势,变化曲线的最低值出现在45%透光率处理时,全光状态下和5%透光率遮阴处理时,各树种的叶绿素a/b值基本相近。从4个灌木树种的光响应曲线参数数值上看,沙棘的各项指标数值均最高,其次是紫穗槐。荆条的光补偿点、表观量子效率、暗呼吸速率都是最低的,虽然其光能利用率较低,但是因为其呼吸速率低,所以进入积累干物质状态的速度较快,且其最大净光合速率较低,利用弱光的能力较强,是4个灌木树种中耐阴性最强的,其次是柠条,耐阴性最差的是沙棘。The chlorophyll content and the photosynthetic characteristics parameters of four shrub species mixed with Chinese pine under different levels of light environments have been measured to analyze the shade tolerance of these four shrub species .The results show that no significant difference of leaf chlorophyll a/b value can be observed between different tree species but between different levels of light environments .With the increase of shade inten-sity ,the leaf chlorophyll a/b value curves of 4 tree species are changing like waves with the minimum value under the light environment of 45 percent light transmittance .T he leaf chlo-rophyll a/b values of different tree species under the 100% light environment and 5% light transmittance are nearly the same .Each photosynthetic characteristic parameter of H ip po-phae rhamnoides is higher than anyone of the other three ,followed by Amorpha f ruticosa . The light compensation point ,the apparent quantum yield and the dark respiration rate of Vitex negundo var .heterophyllaare lower than any one of the others .Although its light u-tility efficiency is low ,its dry matter accumulation starts earlier and it has stronger capacity of weak light utility .Therefore ,Vitex negundo var .heterophylla .has the strongest shade tolerance capacity among the four shrub species ,followed by Caragana microphylla ,Amorpha fruticosa and Hippophae rhamnoides .

关 键 词：油松混交林 灌木树种 叶绿素含量 光响应曲线 

分 类 号：S718.5[农业科学—林学]