高速公路人工边坡紫穗槐光合特性及环境因子  

Photosynthetic characteristics of Amorpha fruticosa L. and environmental factors on the artificial slope of highway

作　　者：赵斌[1,2] 王英宇 宋桂龙[2] 

机构地区：[1]北京市首发天人生态景观有限公司,北京102600 [2]北京林业大学草坪研究所,北京100083

出　　处：《中国水土保持科学》2015年第5期58-63,共6页Science of Soil and Water Conservation

基　　金：国家林业局林业科学技术推广项目"裸露坡面植被恢复综合技术师范推广(201131)";北京市首都公路发展集团有限公司科技项目"高速公路岩石边坡绿化养护技术研究"

摘　　要：采用Li-6400光合分析仪,对人工边坡不同坡向紫穗槐(Amorpha fruticose L.)叶片净光合速率及其相关环境因子的日变化规律进行观测。结果表明:在7月份晴天条件下,光照强度、大气CO2浓度、大气相对湿度是影响高速公路人工边坡紫穗槐生长的主要环境因子。不同坡向的环境因子变化趋势存在一定的差异,其中阳坡变化幅度较大,并且阴坡环境因子的变化时间比阳坡滞后2 h。不同坡向的紫穗槐光合特性不同,紫穗槐在阳坡较高的光合速率(6.57μmol/(m-2·s))和蒸腾速率(3.3 mmol/(m-2·s))下未表现出显著的高生长速度。不同坡向的紫穗槐光合速率与环境因子相关性分析表明:阳坡与光合速率关系最密切的环境因子为气孔导度和光照强度;而光照强度则是影响阴坡净光合速率的最主要因素。The diurnal variations of Pnor Trof Amorpha fruticosa L. on different aspects of artificial slope were studied under natural conditions by Li-6400 photosynthesis analyzer. The result showed that the mainly factors affecting the growth of A. fruticosa at highway artificial slope were PAR,atmospheric CO2 concentration,relative atmospheric humidity on sunny days of July,and PAR was the primary factor that affected photosynthesis on different slope aspects,the highest solar radiation and the daily average solar radiation in shady slopes were both lower on shady slopes than on sunny slopes. The diurnal variation in different slope directions varied,with the range of variation larger on sunny slopes. The varying time of environmental factors on the shady slopes was two hours later than on the sunny slopes. The lowest point of relative atmospheric humidity appeared two hours later on shady slopes. The atmospheric CO2 concentration on shady slopes on shady slopes was higher than that on sunny slopes all day long. The stomatal conductance of A. fruticosa in different slope directions had the same trend of variation,showing bimodal curves,but without obvious midday depression. The water utilization in different slope directions varied： the water utilization on shady slopes was higher in the morning,while on the sunny slope it was higher in the afternoon. This indicated that,in practice,irrigation on highway artificial slopes shouldtake into account the different aspects of site conditions,which plays an important role in water utilization and water loss reduction. In this study,the photosynthesis characteristics of A. fruticosa in different slope directions were different,and there were no obvious higher growth and water consumption on sunny slope（ photosynthetic rate 6. 57 μmol·m^-2·s^-1,and transpiration rate 3. 3 mmol·m^-2·s^-1）. Different correlations could be found between photosynthetic rate and environmental factors in different slope directions. The stomatal conductance,light intensity and net photosynth

关 键 词：高速公路 人工边坡 不同坡向 光合作用 环境因子 

分 类 号：S793.2[农业科学—林木遗传育种] Q945.11[农业科学—林学]