板蓝根光合及水分生理生态特性1)

    张劲松 孟 平 高 峻 (中国林业科学研究院林业研究所,北京,100091)

    摘 要 研究了太行山低山丘陵区板蓝根在20 ℃温度条件下 ,不同光合有效辐射( PA R)强度及不同CO2 摩尔

    分数( CCO2)范围内叶片光合及水分生理生态参数的变化特征。结果表明: ①400μmol· mol

    - 1

    CO2 摩尔分数条件

    下 ,板蓝根叶片净光合速率( Pn)与 PA R之间的回归方程: Pn = - 9 ×10 - 6

    P2

    A R + 0. 027 1 PA R - 1. 256 4 ,相关系数可

    达 0. 966 4 ( n = 40) ;光饱和点、补偿点及表观量子效率分别为1 505. 6μmol· m- 2

    · s

    - 1

    、 52. 834μmol· m- 2

    · s

    - 1

    、 0. 034 4 ;叶

    片蒸腾速率( Tr)与 PA R间回归方程: Tr = 0. 003 6 PA R + 6. 165 3 ,相关系数 0. 813 2 , F = 74. 19 > F38

    0. 01 = 2. 85 ;叶片

    水分利用率( WU E)与 PA R间回归方程: WUE = - 10- 6

    P2

    AR + 0. 003 4 PAR - 0. 256 7 ,二者相关系数为0. 868 4( n = 40) ;② 1

    200μmol· m- 2

    · s

    - 1

    PAR条件下, Pn 与 CCO2

    之间回归方程 Pn = - 3× 10- 5

    CCO2

    2 + 0. 060 6CCO2

    - 5. 009 3 ,相关系数为0. 988

    3( n = 40) ,CO2 饱和点、补偿点及羧化效率分别为1 010. 0μmol· mol

    - 1

    、 86. 35μmol· mol

    - 1

    、 0. 0218 ; Tr 随 CCO2

    的增加呈直

    线下降趋势,但二者关系并不明显, WUE与 CCO2

    之间回归方程为: WUE = - 7× 10 - 7

    C2

    CO2

    + 0. 002 7CCO2

    , 相关系数 r = 0.

    977 1。

    关键词 板蓝根;光合;蒸腾;水分利用率

    分类号 S567. 239

    Characteristics of Photosynthesis and Water Physio - ecology of Isatis indigotica Zhang Jinsong , Meng Ping , Gao J un

    (Forest ry Research Institute of Chinese Academy of Forest ry , Beijing 100091 , P. R. China) Journal of Northeast

    Forest ry University. - 2004 ,32 (3) . - 26～28

    Under the condition of 20℃, the different intensities of photosynthesis active radiation( PA R) and different ranges of

    CO2 contents( CCO2) , the characteristics of leaf photosynthesis and water physio - ecology of Isat is indigot ica were stud2

    ied in the hilly region of Taihang Mountain. The results showed that under the condition of 400μmol· mol

    - 1

    CCO2

    , the

    regression equations between net photosynthesis rate ( Pn) and PA R is Pn = - 9 ×10 - 6

    P2

    A R + 0. 027 1 PA R - 1. 256 4

    with regression coefficient r = 0. 966 4 ( n = 40) ; the critical points of light saturation and light compensation , apparent quantum

    yield(AQY ) are 1 505. 6μmol· m- 2

    · s

    - 1

    , 52. 834μmol· m- 2

    · s

    - 1

    , 0. 034 4 , res pectively; the regressive equation between trans pi2

    ration ( Tr) and PAR is 0. 003 6 PAR + 6. 165 3 with r = 0. 813 2( n = 33) , F = 74. 19 > F38

    0. 01 = 2. 85 , the regressive equation be2

    tween trans piration ( Tr) and PAR is WUE = - 10- 6

    P2

    AR + 0. 003 4 PAR - 0. 256 7 with r = 0. 868 4( n = 40) . Under the condition

    of PAR is 1 200 mol· m- 2

    · s

    - 1

    , the regressive equation between Pn and CO2 contents is - 3× 10- 5

    C2

    CO2

    + 0. 060 6CCO2

    - 5. 009 3

    with r = 0. 988 3( n = 40) , CO2 saturation point , compensation point and Carboxylation efficiency are 1 010. 0μmol· mol

    - 1

    ,86. 35μmol· mol

    - 1

    , 0. 021 8 , respectively. Tr has a linearity - reducing tendency along with the decrease of CO2 con2

    tents , but there is no significant correlation between the both. The regressive equation between WU E and CO2 contents is

    WU E = - 7 ×10 - 7

    CCO2

    2

    + 0. 002 7 CCO2

    , r = 0. 977 1 ( n = 40) .

    Key words Isat is indigot ica ; Photosynthesis ; Transpiration ; Water utilization efficient

    光合与蒸腾特性及水分利用率是植物重要的生态生理参

    数 ,对药材栽培及管理具有重要的理论指导意义。板蓝根

    ( Isat is indigot ica Fort)为2 年生草本植物 ,是我国传统中药材

    植物 ,具有清热解毒、凉血消肿之功效[ 1 ]

    ,市场前景较好 ......