遮阴对建植初期混播草坪草光响应曲线的影响  

Effect of shading on light response curve of mixed lawn grass during the initial stage of establishment

作　　者：张冉 韩博[1] 杨蔚 唐敏[1] 任健[1] 许文花[1] 马向丽[1] ZHANG Ran;HAN Bo;YANG Wei;TANG Min;REN Jian;XU Wenhua;MA Xiangli(College of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, Yunnan, China;Kunming Cigarette Factory of Hongyunhonghe Group, Kunming 650202, Yunnan, China)

机构地区：[1]云南农业大学动物科学技术学院,云南昆明650201 [2]红云红河集团昆明卷烟厂,云南昆明650202

出　　处：《草业科学》2019年第10期2507-2515,共9页Pratacultural Science

基　　金：云南省重点研发计划项目子课题(2018BB001-03);国家自然科学基金(31601997);云南省基础研究计划面上项目(2019FB044)

摘　　要：本研究以混播草坪草为试验材料,研究了不同遮阴处理(CK、50%、70%)对高羊茅(Festuca arundinacea)和多年生黑麦草(Loliumperenne)的叶绿素含量及光响应曲线的影响,以期为研究遮阴条件下草坪草耐阴性的内在机理及养护管理提供依据。结果表明:1)遮阴处理下高羊茅的叶绿素a、类胡萝卜素含量显著升高,叶绿素b含量显著降低(P<0.05);而多年生黑麦草的叶绿素a、叶绿素b含量显著降低,类胡萝卜素含量显著升高(P<0.05)。2)高羊茅和多年生黑麦草的净光合速率(Pn)及气孔导度(Gs)随光强增加而升高;但高羊茅的Pn及Gs随遮阴强度增加而降低,多年生黑麦草则相反。3)遮阴处理显著降低了高羊茅的最大净光合速率(Amax)、光补偿点(LCP)及光饱和点(LSP)(P<0.05),而多年生黑麦草则相反。4)综合分析认为,高羊茅通过降低生理活动速率来适应荫蔽胁迫,而多年生黑麦草则使叶绿素的合成与分解处于较低的动态平衡来适应荫蔽胁迫,其中多年生黑麦草具有更强的耐阴性。在城市荫蔽环境下的混播草坪,可适当增加混播草坪中多年生黑麦草的比例以提高草坪的外观质量。In this study, the effects of different shade treatments(CK, 50%, and 70%) on the chlorophyll content and light response curves of Festuca arundinacea and Lolium perenne were studied using mixed turf grass. The objective of this study was to provide a basis for studying the internal mechanism of shade tolerance and maintenance management of turfgrass under shading conditions. The results indicated that:1) The content of chlorophyll a and carotenoids of F. arundinacea increased significantly under shade treatments,whilst the contents of chlorophyll b decreased significantly (P < 0.05). The content of chlorophyll a and chlorophyll b of L. perenne decreased significantly.The content of carotenoids increased significantly (P < 0.05);2) With the increasing light intensity, the net photosynthetic rate (Pn) and stomatal conductance (Gs) of F. arundinacea and L. perenne both increased. With the increasing shading intensity, the Pn and Gs of F. arundinacea decreased, the change trends of L. perenne were the opposite;3) The maximum assimilation rate (Amax), light compensation point (LCP) and light saturation point (LSP) of F. arundinacea significantly reduced under the shade treatments (P < 0.05),while the change trends of L. perenne were opposite. 4) Comprehensive analysis showed that F. arundinacea could adapt to shade stress by reducing its physiological activity rate, while L. perenne could adapt to shade stress by keeping the synthesis and decomposition of chlorophyll in a low dynamic balance. Moreover, L. perenne had stronger shade tolerance than F. arundinacea. In the shading environment of the cities, the sowing proportion of L. perenne could be increased appropriately to improve the visual quality of the mixed turf under shade conditions.

关 键 词：高羊茅 多年生黑麦草 叶绿素 气孔导度 净光合速率 光响应曲线 

分 类 号：S688.4[农业科学—观赏园艺]