论文部分内容阅读
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。
The effects of shading treatments on the growth and photosynthetic characteristics such as leaf area, chlorophyll content, photosynthetic rate and carbon dioxide concentration , To explore its shading ability. The results showed that the leaf area after shading treatment was significantly higher than that under full sunlight, and the leaf area increased significantly with the shading degree. The leaf area The thickness of full-leaf treatment was significantly higher than that of two-layer shading net (17% transmittance) and three-layer shading net treatment, which was not significantly different from that of the first layer (46% light transmittance) Under chlorophyll a / b ratio, the ratio of chlorophyll a / b was significantly higher than that of 1 layer of shading net, which was significantly higher than that of 2 and 3 layers of shading net. The net photosynthetic rate under full sunlight was significantly higher than that under shading treatment. In the shading treatment, the net photosynthetic rate obviously decreased with the increase of the degree of shading; the stomatal conductance decreased gradually and the stomatal conductance But the difference was not significant. The stomatal conductance of three-layer shading treatment was significantly lower than that of full-light treatment; the intercellular carbon dioxide concentration increased gradually, and the shading treatment of two and three layers was significantly higher than that of the whole Light and 1 shading treatment, 1 shading treatment is higher than the full light treatment. According to various indicators and field observations, Heimweitizi likes light but has certain shade-tolerance ability and can grow normally under the light intensity of 22.864klx and the light transmittance of 46%.