文章摘要
姜 霞1,苏春花2,伍生磊2,张 喜1.白云质砂石山地区翅荚香槐春季光合生理特性研究[J].广东农业科学,2017,44(9):41-47
查看全文    HTML 白云质砂石山地区翅荚香槐春季光合生理特性研究
Photosynthetic and physiological characteristics of Cladrastis platycarpa(Maxim.) Makino in spring indolomite rocky hills of karst region
  
DOI:10.16768/j.issn.1004-874X.2017.09.007
中文关键词: 白云质砂石山  翅荚香槐  光合特性
英文关键词: dolomite rocky hills  Cladrastis platycarpa(Maxim.) Makino  photosynthetic characteristics
基金项目:国家重点研发计划项目(2016YFC0502605);贵州省科技厅项目(黔科合S 字[2007]1024);贵州 省林业科学研究院士工作站项目(黔科合院士站[2014]4006)
作者单位
姜 霞1,苏春花2,伍生磊2,张 喜1 1. 贵州省林业科学研究院贵州 贵阳 550005 2. 贵州民族大学化学与环境科学学院贵州 贵阳 550025 
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中文摘要:
      采用LI-6400xt 便携式光合测定系统,对白云质砂石山地区适生树种翅荚香槐的春季光合作用 日变化、光响应进行了分析,并分析光合生理与生态因子之间的关系。结果表明:(1)翅荚香槐净光合速 率日变化为双峰曲线,分别在10:00 和14:00 达到峰值,有明显光合“午休”现象;胞间CO2 浓度(Ci) 的日变化与净光合速率(Pn)相反;蒸腾速率(Tr)、气孔导度(Gs)日变化均呈双峰曲线,与Pn 相同; 气孔限制值(Ls)的日变化与胞间CO2 浓度的日变化曲线变化趋势相反;水分利用效率(WUE)日变化呈 单峰曲线,日均值2.91μmol/mmol。(2)翅荚香槐的光饱和点(LSP)为984 μmol/m2·s、最大净光合速率 (Pnmax)为18.46μmol/m2·s、暗呼吸速率(Rd)为-1.39 μmol/m2·s、表观量子效率(α)为0.0445,光 补偿点(LCP)为18.37μmol/m2·s。(3)净光合速率与环境因子简单相关性分析表明,各环境因子对翅荚 香槐叶片净光合速率的影响大小为:Gs>PAR>Tr>Ci>RH>Ca>Ta。
英文摘要:
      Diumal changes of photosynthesis and light response curve of Cladrastis platycarpa(Maxim.) Makino were measured with LI- 6400xt portable photosynthesis system,and the relationship between photosynthetic physiology and ecological factors were analyzed. The results showed as follows:(1)The diurnal change of net photosynthesis rate( Pn) of C. platycarpa(Maxim.) Makino had a double-peak curve ,exhibiting a clear midday depress,and the peak value reached at 10:00 and 14:00. Intercellular CO2 concentration(Ci)had opposite diurnal variation compared with Pn. Diurnal variation of transpiration rate(Tr) and stomatal conductance(Cond) had a double-peak curve as Pn. Stomatal limits(Ls)had opposite diurnal variation compared with Ci. The diurnal variation of water use efficiency( WUE)showed inverse single-peak curve,daily average was 2.91μmol/ mmol.(2)Light saturation point( LSP) of C. platycarpa(Maxim.) Makino was 984μmol/m2·s,the maximum of net photosynthesis rate(Pnmax)was 18.46μmol/m2·s,dark respiration rate(Rd)was -1.39μmol/m2·s, initial quantum efficiency(α)was 0.0445,light compensation point( LCP) was 18.37μmol/m2·s.(3)The net photosynthetic rate and environmental factors correlation analysis showed that:Pn was influenced by environmental factors in the order from high to low:Gs>PAR>Tr>Ci>RH>Ca>Ta.
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