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水深梯度对荆三棱(scirpusyagara)生长的影响

DOI: 10.3724/SP.J.1145.2011.00034, PP. 34-38

Keywords: 水深梯度,荆三棱,形态学参数,叶绿素荧光特性,湿地植物,湿地修复

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Abstract:

研究湿地植物对水深梯度的响应对于湿地修复具有重要的指导意义.在南四湖湖边滩地上的人工修复湿地中开展水深梯度对荆三棱(scirpusyagara)生长的影响研究,试验观测水深分别为-10、0、10、20、30cm共5个梯度.结果显示:随着水位的升高,1)荆三棱的株高、基茎、叶长和叶宽均有所增加,当水位大于10cm时各项指标增加更为显著;2)生物量呈增加趋势,而根茎比则逐渐减小,水位为30cm时的生物量和根茎比分别为-10cm时的2.67倍和58.15%;3)叶绿素含量总体呈增加趋势,但在不同水位间的差异不明显(p>0.05);4)叶绿素荧光方面,最大光化学量子产量fv/fm均在0.75以上,光化学淬灭qp和非光化学淬灭qn分别呈现出升高和下降的趋势.结果表明,在试验所设置的水位条件下(-10~30cm),荆三棱的生长没有受到水深梯度增加的显著影响,相反表现出随着水深的增加而生长更好的趋势.可见,在试验设置的水深梯度范围内,相对较高的水位有利于荆三棱的生长,因此在湿地管理中应控制适当的高水位以利于其种群的生长和稳定.图6参17

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