The Effect of Seasonal Drought to Plant Hydraulics and Photosynthesis of Three Dominant Evergreen Tree Species in Seasonal Tropical Rainforest ofXishuangbanna Limestone Area

doi:10.3724 SP.J.1143.2008.07239

Plant Diversity ›› 2008, Vol. 30 ›› Issue (03): 325-332.DOI: 10.3724 SP.J.1143.2008.07239

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The Effect of Seasonal Drought to Plant Hydraulics and Photosynthesis of Three Dominant Evergreen Tree Species in Seasonal Tropical Rainforest of
Xishuangbanna Limestone Area

WANG Ai-Ying^{1 , 2} , JIANG Yan-Juan^{1 , 2} , HAO Guang-You¹ ^{, 2} , CAO Kun-Fang¹

1 Xishuangbanna Tropical Botanical Garden , Chinese Academy of Sciences , Mengla 666303 , China ;
2 Graduate University of Chinese Academy of Sciences, Beijing 100049 , China

Received:2007-10-15 Online:2008-06-25 Published:2008-06-25
Contact: CAO Kun-Fang

季节性干旱胁迫对石灰山三种常绿优势树种的水分和光合生理的影响

王爱英^{1 , 2} , 姜艳娟^{1 , 2} , 郝广友^{1 , 2} , 曹坤芳¹;

1 中国科学院西双版纳热带植物园, 云南勐腊 666303; 2 中国科学院研究生院, 北京 100049

通讯作者: 曹坤芳

Abstract

Abstract: To investigate the adaptive mechanisms of evergreen species to seasonal drought, we studied seasonal changes of plant hydraulics , photosynthesis and leaf osmotic related traits in three dominant evergreen species ( Celtis wightii, Cleistanthus sumatranus and Lasiococca comberi var. pseudoverticillata) of a limestone mountain area of Xishuangbanna, SW China . Compared to the wet season, the predawn leaf water potential in the dry season is significantly lower in all the three species , indicating a relatively strong soil drought stress. During the dry season, sapwood specific hydraulic conductivity ( K_s ) was significantly lower compared to that of the wet season in Cleistanthus sumatranus and Lasiococca comberi var . pseudoverticillata , but there was no significant change in Celtis wightii . There was no significant change in leaf area specific hydraulic conductivity ( K_l ) between the two seasons in all the three species, which may caused by the adjustment in hydraulic architecture through partial loss of leaves during the dry season . In the dry season , maximum carbon assimilate rate ( Amax ) was significantly lower than that of the wet season in all the three species . There were strong correlations between Amax and both of the two hydraulic traits ( i. e . K_s and K_l ), especially during the wet season, indicating a relatively strong independence of photosynthesis to water transport in stems . Leaf turgor loss point osmotic potential and saturation osmotic potential during the dry season were both significantly lower in all the three species, indicating a strong osmotic adjustment in adaptive to seasonal drought. Compared to the two coccurring deciduous species, the ability to tolerate drought-induced cavitation in stem xylems were substantially higher in the three evergreen species. These results indicated that the adaptation of these three evergreen species to seasonal drought mainly involves an adjustment in hydraulic architecture and a strong osmotic regulation in leaves .

Key words:

Limestone seasonal rainforest

摘要： 以西双版纳地区石灰山季节雨林三种优势常绿树种油朴( Celtis wightii ) 、尖叶闭花木( Cleistanthus sumatranus) 和轮叶戟( Lasiococca comberi var . pseudoverticillata ) 为材料, 研究了季节性干旱对树木枝条水分传导、最大光合速率( Amax ) 和渗透调节相关的叶片的生理生态特征等的影响。结果表明, 与雨季相比三种植物的叶片凌晨水势在旱季都有显著的降低, 说明该生境的植物在旱季遭受较为严重的土壤干旱胁迫。除油朴的枝条边材比导率( K_s ) 在旱季和雨季没有显著性差异外, 尖叶闭花木和轮叶戟的K_s 在旱季都有显著的降低; 而枝条的叶比导率( K_l ) 三树种在两个季节间均无显著变化。K_l 在旱季没有显著性降低,可能是常绿树种在旱季通过脱落部分叶片以调整其水力结构来保持较高的单位叶面积的水分供应。在旱季三树种Amax 都有显著减小。K_s和K_l 都和Amax 呈正相关关系, 说明了枝条木质部的水分传导对叶片光合作用有较直接的影响。三树种叶片膨压丧失点的水势和饱和渗透势在旱季也均显著降低, 表明三树种都通过较强的渗透调节来适应季节性的干旱。与同一生境中两种常见落叶树种相比较, 三树种木质部导管抵抗空穴化的能力较强, 能在较低的木质部水势下保持其水分传导, 以在旱季仍能维持叶片较为正常的生理功能。这些结果初步揭示了石灰山常绿优势树种通过水力结构的调整和渗透调节等来适应季节性干旱的策略。

关键词: 石灰山季节雨林, 干旱胁迫, 水分传导, 光合作用

CLC Number:

Q 948

WANG Ai-Ying^, , JIANG Yan-Juan^, , HAO Guang-You ^, , CAO Kun-Fang.

The Effect of Seasonal Drought to Plant Hydraulics and Photosynthesis of Three Dominant Evergreen Tree Species in Seasonal Tropical Rainforest of
Xishuangbanna Limestone Area

[J]. Plant Diversity, 2008, 30(03): 325-332.

王爱英1 , 2 , 姜艳娟1 , 2 , 郝广友1 , 2 , 曹坤芳1 ; . 季节性干旱胁迫对石灰山三种常绿优势树种的水分和光合生理的影响[J]. Plant Diversity, 2008, 30(03): 325-332.

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The Effect of Seasonal Drought to Plant Hydraulics and Photosynthesis of Three Dominant Evergreen Tree Species in Seasonal Tropical Rainforest of
Xishuangbanna Limestone Area

季节性干旱胁迫对石灰山三种常绿优势树种的水分和光合生理的影响

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