遮荫对海姆维斯蒂栒子生长及光合特性的影响  

Effect of Shading on Growth and Photosynthetic Characteristics of Cotoneaster hjelmqvistii

作　　者：刘芳 李怡然[2] 刘峄[2] 贾爱军[3] 张婷[2] 骆建霞[2] 

机构地区：[1]天津市翠屏湖科学园,天津301908 [2]天津农学院园艺系,天津300381 [3]天津市林业果树研究所,天津300381

出　　处：《北方园艺》2014年第7期52-56,共5页Northern Horticulture

摘　　要：以1年生海姆维斯蒂栒子组培苗为试材,研究了遮荫处理对海姆维斯蒂栒子叶片面积、叶绿素含量、光合速率、胞间二氧化碳浓度等生长及光合特性的影响,以探讨其耐荫能力。结果表明:遮荫处理后的叶片面积极显著高于全光照条件下的叶片面积,且随遮荫程度的增加叶片面积显著增加,3层遮阳网处理下(透光率8%)的叶片面积最大;全光照处理的叶片厚度极显著高于2层遮阳网(透光率17%)和3层遮阳网处理,与1层(透光率46%)遮荫处理差异不显著;遮荫处理下的叶绿素含量极显著高于全光照处理,而全光照处理下的叶绿素a/b的比值显著高于1层遮阳网处理,极显著高于2、3层遮阳网处理。全光照条件下的净光合速率极显著高于遮荫处理,在遮荫处理中,随着遮荫程度增加,净光合速率明显减小;气孔导度逐渐降低,全光照条件下的气孔导度高于1、2层遮荫处理,但差异不显著,3层遮荫处理的气孔导度极显著低于全光照处理;胞间二氧化碳浓度逐渐增加,2、3层遮荫处理显著高于全光照和1层遮荫处理,1层遮荫处理高于全光照处理。综合各项指标及田间观察认为,海姆维斯蒂栒子喜光,但具有一定的耐荫能力,在光照强度22.864klx、透光率46%的环境下可以正常生长。Using one-year-old tissue cultured plants of Cotoneaster hjelmclvistii as test material, effect of shading treatment on leaf area,chlorophyll content, photosynthetic-rate and intercellular CO2 concentration were studied to understand the shade-tolerance of C. hjelmqvistii. The results showed that the leaf area covered with shade net was very significantly larger than that under full sunlight condition and trended to increase significantly with the increase of shading degree and presented the largest leaf area under three layers of shade nets （8% of light transmission rate）. The leaf thickness under full sunlight conditions was very significantly thicker than that covered with two （17% of light transmission rate） and three layers of shade nets,but had no significantly difference with that covered with one layer of shade net （46% of light transmission rate）. Chlorophyll content under shading conditions was significantly higher than that in full sunlight condition in which ratio of chlorophyll a/b was significantly higher than that covered with one layer of shade net and was very significantly higher than that with two layers of shade nets or with three layer covers. Photosynthetic rate under full sunlight condition was significantly higher than that with shading conditions. Under the shade conditions,photosynthetic rate and stomatal conductance was significantly reduced while intercellular CO2 concentration increased significantly with increasing degree of shading. Taking the tested indicators and field observation into account, C. hjelmqvistii could be considered as a heliophile,and had shade-tolerance in a certain degree and could grow normaly in 22. 864 klx of light intensity and 46% of light transmission rate.

关 键 词：海姆维斯蒂枸子 遮荫处理 叶片面积 光合特性 叶绿素含量 

分 类 号：S615[农业科学—园艺学]