以生长于重庆缙云山国家级自然保护区内的粉叶新木姜子(Neolitsea aurata var.glauca Yang)和四川大头茶〔Polyspora speciosa(Kochs)B.M.Barthol.et T.L.Ming〕2年生幼苗为实验材料,研究了不同p H值的模拟酸雨对叶片气体交换参数、光...以生长于重庆缙云山国家级自然保护区内的粉叶新木姜子(Neolitsea aurata var.glauca Yang)和四川大头茶〔Polyspora speciosa(Kochs)B.M.Barthol.et T.L.Ming〕2年生幼苗为实验材料,研究了不同p H值的模拟酸雨对叶片气体交换参数、光响应曲线和光响应参数的影响,并比较了2树种对模拟酸雨的抗性。结果表明:四川大头茶叶片的各项气体交换参数和光响应参数总体上高于粉叶新木姜子。随模拟酸雨p H值降低,粉叶新木姜子叶片的净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)逐渐降低且总体上显著低于对照(p H 5.6模拟酸雨);四川大头茶叶片的Pn、Gs和Tr值在p H 2.0模拟酸雨作用下显著低于对照、在p H 3.5模拟酸雨作用下显著高于对照;但不同p H值模拟酸雨对2树种叶片的水分利用效率总体上无显著影响。经不同p H值模拟酸雨处理后2树种叶片的光响应曲线与对照明显不同。与对照相比,经p H 2.0、p H 2.5和p H 3.5模拟酸雨处理后粉叶新木姜子叶片的最大净光合速率(Pmax)、光饱和点(LSP)和表观量子产量(AQY)总体上显著降低,光补偿点(LCP)显著升高;其暗呼吸速率(Rd)在p H 2.0和p H 3.5模拟酸雨作用下显著高于对照、在p H 2.5模拟酸雨作用下显著低于对照。四川大头茶叶片的Pmax和LSP值在p H 2.0和p H 2.5模拟酸雨作用下显著低于对照,但在p H 3.5模拟酸雨作用下显著高于对照;其LCP和Rd值在p H 2.5和p H 3.5模拟酸雨作用下显著低于对照,但在p H 2.0模拟酸雨作用下均高于对照;其AQY值在p H 2.0、p H 2.5和p H 3.5模拟酸雨作用下均低于对照。研究结果显示:酸性较强(p H 2.0和p H 2.5)的模拟酸雨均可抑制2树种的光合作用,而酸性较弱(p H 3.5)的模拟酸雨对四川大头茶的光合作用有一定的促进作用,表明四川大头茶对酸雨的抗性相对强于粉叶新木姜子。展开更多
The paper had studied phenological phase of three wild plants in Haishi Park at limestone mountainous area of Chongqing which were Berchemia polyphylla var.leioclada,Caesalpinia decapetala and Bauhinia glauca subsp.hu...The paper had studied phenological phase of three wild plants in Haishi Park at limestone mountainous area of Chongqing which were Berchemia polyphylla var.leioclada,Caesalpinia decapetala and Bauhinia glauca subsp.hupehana.Samples were selected based on terrain,and it had selected 30 plants of Berchemia polyphylla var.leioclada and Caesalpinia decapetala and 7 plants of Bauhinia glauca subsp.hupehana which were different in shape but similar in size.Fixed point observation was conducted on them and observation results were recorded.It had explored ornamental value of the three wild plants and identified their corresponding ornamental periods,so as to provide scientific reference and suggestions for gardening and application of the three wild plants.展开更多
文摘以生长于重庆缙云山国家级自然保护区内的粉叶新木姜子(Neolitsea aurata var.glauca Yang)和四川大头茶〔Polyspora speciosa(Kochs)B.M.Barthol.et T.L.Ming〕2年生幼苗为实验材料,研究了不同p H值的模拟酸雨对叶片气体交换参数、光响应曲线和光响应参数的影响,并比较了2树种对模拟酸雨的抗性。结果表明:四川大头茶叶片的各项气体交换参数和光响应参数总体上高于粉叶新木姜子。随模拟酸雨p H值降低,粉叶新木姜子叶片的净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)逐渐降低且总体上显著低于对照(p H 5.6模拟酸雨);四川大头茶叶片的Pn、Gs和Tr值在p H 2.0模拟酸雨作用下显著低于对照、在p H 3.5模拟酸雨作用下显著高于对照;但不同p H值模拟酸雨对2树种叶片的水分利用效率总体上无显著影响。经不同p H值模拟酸雨处理后2树种叶片的光响应曲线与对照明显不同。与对照相比,经p H 2.0、p H 2.5和p H 3.5模拟酸雨处理后粉叶新木姜子叶片的最大净光合速率(Pmax)、光饱和点(LSP)和表观量子产量(AQY)总体上显著降低,光补偿点(LCP)显著升高;其暗呼吸速率(Rd)在p H 2.0和p H 3.5模拟酸雨作用下显著高于对照、在p H 2.5模拟酸雨作用下显著低于对照。四川大头茶叶片的Pmax和LSP值在p H 2.0和p H 2.5模拟酸雨作用下显著低于对照,但在p H 3.5模拟酸雨作用下显著高于对照;其LCP和Rd值在p H 2.5和p H 3.5模拟酸雨作用下显著低于对照,但在p H 2.0模拟酸雨作用下均高于对照;其AQY值在p H 2.0、p H 2.5和p H 3.5模拟酸雨作用下均低于对照。研究结果显示:酸性较强(p H 2.0和p H 2.5)的模拟酸雨均可抑制2树种的光合作用,而酸性较弱(p H 3.5)的模拟酸雨对四川大头茶的光合作用有一定的促进作用,表明四川大头茶对酸雨的抗性相对强于粉叶新木姜子。
基金Supported by Funds of National Spark Program(2006EA105025)Funds of Haishi Park of Chongqing City~~
文摘The paper had studied phenological phase of three wild plants in Haishi Park at limestone mountainous area of Chongqing which were Berchemia polyphylla var.leioclada,Caesalpinia decapetala and Bauhinia glauca subsp.hupehana.Samples were selected based on terrain,and it had selected 30 plants of Berchemia polyphylla var.leioclada and Caesalpinia decapetala and 7 plants of Bauhinia glauca subsp.hupehana which were different in shape but similar in size.Fixed point observation was conducted on them and observation results were recorded.It had explored ornamental value of the three wild plants and identified their corresponding ornamental periods,so as to provide scientific reference and suggestions for gardening and application of the three wild plants.