草地学报

›› 2010, Vol. 18 ›› Issue (2): 188-194.DOI: 10.11733/j.issn.1007-0435.2010.02.009

• 研究论文 • 上一篇    下一篇

湘西南湿热地区不同秋眠级紫花苜蓿光合特性研究

杨曌1,2, 李向林1, 张新全2, 万里强1, 何峰1   

  1. 1. 中国农业科学院北京畜牧兽医研究所, 北京, 100193;
    2. 四川农业大学草业科学系, 四川, 雅安, 625014
  • 收稿日期:2009-03-06 修回日期:2009-10-12 出版日期:2010-04-15 发布日期:2010-04-15
  • 通讯作者: 李向林,E-mail:lixl@iascaas.net.cn
  • 作者简介:杨曌(1982- ),男,内蒙古包头人,硕士研究生,研究方向为牧草及草坪草育种与种质资源,yangzhao2315@sina.com
  • 基金资助:
    国家科技支撑计划项目(2006BAD16B07);基本科研业务费专项项目(ywf-td-3);行业科技项目(nyhyzx07-022)

Study on the Photosynthetic Characteristics of Alfalfa with Different Fall-dormancy Levels in the Southwest Region of Hunan Province

YANG Zhao1,2, LI Xiang-lin1, ZHANG Xin-quan2, WAN Li-qiang1, HE Feng1   

  1. 1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100094, China;
    2. Department of Grassland Science, Sichuan Agricultural University, Yaan, Sichuan Province 625014, China
  • Received:2009-03-06 Revised:2009-10-12 Online:2010-04-15 Published:2010-04-15

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摘要： 利用Li-6400光合速率测定系统测定了16种不同秋眠级紫花苜蓿(Medicago sativa L.)品种的净光合速率、气孔导度、蒸腾速率、胞间CO2浓度、光量子通量密度、水分利用率;同时对不同秋眠级紫花苜蓿草产量进行测定。结果表明:阿尔冈金(Algonquin)、四季旺(Overseason)、维多利亚(Victoria)、WL525、萨兰多(Salado)、WL414、CW403、721丰叶(721Amerilea)、皇后2000(Empress2000)、牧歌,701(Amerigraze701)、丰宝(Powerplant)的光合速率日变化曲线呈双峰型,而CW400、CW680、路宝(Lobo)、猎人河(Hunter River)、盛世(Millenium)呈三峰型,16个品种净光合速率日变化均出现午休现象,其变化规律与秋眠级没有相关性;盛世、牧歌701、丰宝净光合速率较高在20μmolCO2·m-2·s-1以上;牧歌701、路宝、WL525蒸腾速率较高在均在10 mmolH2O·m-2·s-1以上;CW403、721丰叶(721Amerilea)水分利用率较高,达5μmol CO2·mmol H2O-1以上。在湘西南湿热地区环境气候条件下,盛世、牧歌701、丰宝、4季旺等光合能力较强、蒸腾速率高的品种可作推广种植。

关键词: 苜蓿, 秋眠级, 净光合速率, 蒸腾速率, 水分利用率

Abstract: The diurnal variations of net photosynthesis rate(Pn),stomatal conductance(GS),transpiration rate(Tr),intercellular CO2 concentration(Ci),photon flux density(PFD),and water utilization efficiency(WUE) of 16 alfalfa cultivars with different fall-dormancy levels were measured using Li-6400 Portable Photosynthesis System and the yields were measured at same time.The results show that cultivars Algonquin,Overseason,Victoria,WL525,Salado,WL414,CW403,721Amerilea,Empress2000,Amerigraze701,and Powerplant had the diurnal variation laws with the bimodale shape in the Pn;and CW400,CW680,Lobo,Hunter River,and Millenium the ternary-peak shape in the Pn.An obvious "midday-rest" phenomenon in Pn was shown for each alfalfa cultivar and no correlation was detected between it and full-dormancy level.Cultivars Millenium,Amerigaze701,and Powerplant had higher Pn which was above 20 μmolCO2·m-2·s-1;Amerigaze701,Lobo,and WL525 had higher Tr which was above 10 mmolH2O·m-2·s-1;CW403 and 721Amerilea had higher WUE which was above 5 μmolCO2·mmolH2-1.In the circumstance of southwest region of Hunan province,cultivars with higher Pn and Tr should be planted widely.

Key words: Alfalfa, Fall-dormancy level, Net photosynthetic rate, Transpiration rate, WUE

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