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老鼠?幼苗在潮汐环境下对不同光强的生理生态响应

, PP. 192-199

Keywords: 红树林,老鼠?,光照强度,模拟潮汐

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Abstract:

采用自制潮汐模拟系统培养红树植物老鼠?幼苗,设置7个相对于自然光5%、15%、20%、45%、60%、75%、100%的光照强度,研究了不同光强对老鼠?幼苗从发芽至生长10个月的生理生态影响。随着光照强度的升高,幼苗的保存率、苗高、地径、根干质量、茎干质量、叶干质量、单株生物量、根冠比、根系活力、叶面积、叶绿素a、b含量均是先升后降;可溶性糖含量、净光合速率、蒸腾速率、气孔导度、最大净光合速率随光强增大而增加。在淹浸30 min内,不同光照强度的净光合速率均有增大的表现,而气孔导度均降低,且最终均稳定在初始值以下。试验表明:光照强度为45%时,多数生理生态指标表现为促进植物的生长;当光照强度为20%时,老鼠?幼苗通过降低根冠比、光补偿点,增加苗高、叶绿素含量、叶面积和表观量子利用效率来提高自身光能获取的效率;当光照强度为5%时,光照会显著抑制幼苗的生长,但保存率依然在60%以上。可以认为,极低的光照强度致使幼苗生长缓慢,但并不影响其自然定居的密度;同时,在不同光强下,老鼠?光饱和点和光补偿点均很低。以上可以解释淇澳岛红树林林下存在高密度老鼠?的原因是由于其自身拥有高的耐阴能力,同时对光照减弱有极强的适应能力。

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