几种生态因子对菹草光合作用的影响
EFFECTS OF ECOLOGICAL FACTORS ON PHOTOSYNTHESIS OF POTAMOGETON CRISPUS
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摘要: 本文研究了光照、pH、温度对菹草光合作用的影响。在一定温度条件下,菹草的净产氧量与一定范围的光照强度呈直线相关。菹草的光补偿点随温度的上升而上升。在菹草自然生活的环境中,温度低于30℃时,升温有利于菹草的光合作用。高pH(PH>10.0)下碳源缺乏对菹草的光合作用影响较大。高pH与强光照射的协同作用严重影响菹草的光合作用。水温与氮、磷营养盐不足并非夏季自然水体中菹草死亡的主要原因。而不良光照(水表层光抑制,中、下层光饥饿)和高pH下缺乏光合碳源的协同作用便可能导致菹草夏季死亡。Abstract: This study investigated the effect of light intensity, pH and temperature on the photosynthesis of Potamogeton crispus. At a given temperature, net oxygen production of P. crispus was linear related to light intensity. Light compensation point increased with increased temperature. In the natural environment of P. crispus, below 30℃ an increase in temperature enhanced photosynthesis of P. crispus. At high pH (>10), shortage in carbon source had great influence on the photosynthesis of P. crispus. Combinations of high pH and strong light intensity seriously affected photosynthesis. High temperature and deficiency in nitrogen and phosphorus are not major cause for the mortality of P. crispus. The combination of infavorable light conditions (inhibition by strong light at surface and light deficiency at deeper depths) and shortage of inorganic carbon source at high pH may have caused summer mortality of this species.
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