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cje ›› 2004, Vol. ›› Issue (2): 26-31.

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Physioecological characteristics of W. septentrionalis seedlings under various soil water conditions

ZENG Xiaoping, ZHAO Ping, CAI Xian, SUN Guchou, PENG Shaolin   

  1. South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2002-09-03 Revised:2002-10-22 Online:2004-04-10

Abstract: In this study, the physioecological characteristics of transplanted seedlings of W. septentrionalis, an endangered plant were compared under three defferent soil water conditions in Guangdong Province. The soil water contents (Sw) for plants growth were 20.1%, 14.3% and 13.2%, respectively.The net photosynthetic rate (Pn), stomatal conductance (gs), intrinsic water use efficiency (WUE=Pn/gs), specific leaf area (SLA) and photosynthesis-light response curves of leaves were measured. Results showed that both Pn and gs of plants increased with raising Sw. The daily average values of Pn and gs were 8.55±4.32 and 81.57±8.41μmol·m-2·s-1 under the highest Sw condition, wich were 25.61% and 17.68% higher than that under the lowest Sw condition respectively. On the orther hand, WUE and SLA of plants tended to increase with reduction of Sw condition. The daily average values of WUE and SLA under the lowest Sw condition were 108·94±16.37μmol·mol-1 and 96.61±23.82cm2·g-1 ,which were 0.28% and 15.87% higher than that under the highest Sw condition, respectively. The variation ranges of WUE were smaller among different Sw. According to the photosynthesis-light response curves, there was an increase in the saturation point of the photosynthesis of W. septentrionalis with raising Sw. The results suggest that higher soil moisture was beneficial to growth of W. septentrionalis.

Key words: Allelopathy, Wheat, Cucumber, Radish

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