摘要
通过盆栽试验,利用遮荫网设置光照梯度(透光率分别为100%、76.19%、59.27%、38.09%),研究了光照强度对马蹄金生理指标和光合特性的影响。结果表明,随着光照强度的降低,马蹄金叶片中SOD、POD、CAT活性均逐渐增大;O2-含量和MDA含量均呈下降趋势,说明高度遮荫马蹄金叶片膜系统受到伤害;叶绿素a和叶绿素b均表现出上升的趋势,叶绿素a与叶绿素b的比值逐渐下降;光合有效辐射、净光合速率和蒸腾速率逐渐降低。光合有效辐射均呈"单峰"型,最高峰出现在13∶00。遮荫条件下T1处理蒸腾速率最大。高度遮荫不利于马蹄金的生长。
The effects of different gradients of artificial light intensity(100%,76.19%,59.27%,38.09%) on physiological indexes and photosynthetic characteristics in Dichondra repens were studied with pot experiment.The results showed that:(1) The SOD,POD and CAT activity in leaves increased gradually with decreasing of light intensity.(2) The content of O-2 and MDA in leaves decreased gradually with decreasing of light intensity.It indicated that the higher shading made the membrane system in leaves of Dichondra repens damaged.(3) The content of Chla and Chlb in leaves increased,the value of Chla/Chlb decreased gradually with decreasing of light intensity.(4) The PAR,Pn and E in leaves decreased with decreasing of light intensity.The figure of PAR was one-peak-curve and the highest apex appeared at 13:00.The traspiration rate of T1 was the maximal.The results indicated higher shading was not good for the growth of Dichondra repens.
出处
《中国草地学报》
CSCD
北大核心
2012年第5期87-92,共6页
Chinese Journal of Grassland
基金
安徽高校省级自然科学研究项目基金(KJ2012B219)
安徽省高校青年教师资助计划项目(2008jq1182)
安徽省高校自然科学基金重点项目(kj2011A129)
安徽省自然科学基金(11040606M77)
关键词
马蹄金
光照强度
保护酶活性
光合特性
Dichondra repens
Light intensity
Protective enzymes
Photosynthetic characteristics