牲畜废水对两种红树植物幼苗的影响

研究了淡水(盐度为0）和海水(盐度为30)两种盐水度条件下温室盆栽系统红树植物秋茄和榄对牲畜废水的生长和生理反应．结果表明，牧畜废水对秋茄和木榄的生长指标(包括高度、基径、叶片生成量、最大叶面积和相对生长率)有显著促进作用；盐度水平和废水的加入均对秋茄生物量的分配无明显影响，但废水使木榄的根生物量比和根／茎比减小而叶生物量比增加；两种盐度下废水处理组秋茄加绿素a、叶绿素b含量与相应对照组无显著差异，而木榄有比对照高的叶绿素a、叶绿素b含量；废水处理组秋茄叶片电导率高于对照组，但木榄叶片电导率在淡水条件下与对照组无显著差异，在海水条件下甚至低于对照组；牲畜废水对秋茄和木榄的根系活力均无显著影响；在两种盐度条件下牲畜废水均导致秋茄茎和根POX活性的明显增强，而对叶POX活性则无显著影响，牲畜废水对木榄叶和茎POX活性无显著影响，而木榄根POX活性淡水条件下下降、海水条件下则升高；两种盐度条件下牲畜废水均使得木榄各器官的SOD活性显著下降，而对秋茄SOD活性基本无显著影响。

Effects of livestock wastewater on seedlings of two mangrove species

Effects of livestock wastewater on growth and physiology of seedlings of two mangrove species ( Kandelia candel and Bruguiera gymnorrhiza ) in greenhouse pot cultivation systems were studied under different salinity conditions. In terms of stem height, stem basal diameter, leaf production, maximum leaf area and relative growth rate, livestock wastewater enhanced the growth of Kandelia candel and Bruguiera gymnorrhiza . The effects of salinity and livestock wastewater on biomass partitioning were significant for Bruguiera gymnorrhiza , but not for Kandelia candel .Under livestock wastewater application,the chlorophyll a and b contents of Bruguiera gymnorrhiza leaves increased,but the electric conductance had no significant variation.Wastewater increased the leaf electric conductance of Kandelia candel , but had no significant effects on its chlorophyll a and b contents.Under the two salinity conditions, there was no significant difference in root activity of both species. The POX activity increased in the stem and root of Kandelia candel under the two salinity conditions, while decreased in the root of Bruguiera gymnorrhiza under freshwater condition,and increased under seawater condition. The SOD activity of Bruguiera gymnorrhiza decreased, but for Kandelia candel ,it had no significant change.