摘要
通过室内试验,将苦草(Vallisneria natans)种子播种在不同附着基质上,对其发芽情况和苦草的形态特征及生物量分配格局进行了研究。结果表明:(1)在人工丝状棉上生长的苦草新生叶片数、最长根长、茎叶总长都要显著大于在薄层海绵和棕丝束上生长的苦草。而对照无附着基质组的苦草部分浮于水面,叶片枯黄,各项生长指标均低于其他3组;(2)对照组中生长的苦草根数量最少,显著小于其他3个试验组上生长的苦草,但是该组苦草的根上生物量占有率及出现弯曲茎的数量大大高于其他3组;(3)人工丝状棉基质上,苦草的存活率显著大于薄层海绵基质和棕丝束基质,也显著大于对照组(无基质),四组的存活率分别为91%,88%,69%,21%。因此,基质条件对苦草的生长和形态有较大的影响,如果没有附着基质,苦草易于漂浮水面而死亡;在结构疏松的人工丝状棉基质上,苦草长势最好,但考虑到苦草在基质上的附着牢度和基质浸泡水中的理化变化,故本次试验中,薄层海绵为最好的附着基质。
In the indoor experiment,the seeds of Vallisneria natans were sown on the different substrates in order to study the sprout,morphology and biomass allocation in V.natans.The results showed that compared with the seeds of V.natans grown in thin layer of sponge and palm,the seeds grown in artificial silk cotton had more new leaves and bigger length of the longest root as well as total length of stem and leaf.However,some of V.natans grown in control group without substrate floated on water surface with wither leaves and they had lower growth parameters than other groups.In spite of the smallest number of roots,V.natans grown in control group had a higher biomass ratio of root to shoot and a larger number of plants with curved stem.The survival rate of V.natans grown in artificial silk cotton was bigger than other groups.And the survival rate of V.natans grown in artificial silk cotton,thin layer of sponge,palm and control group were 91%,88%,69% and 21% respectively.In conclusion,the growth and morphology of V.natans was greatly affected by different substrates.Without substrate,V.natans was likely to float on water surface and die;meanwhile,V.natans grown in the artificial silk cotton with loosen structure grew well.Considering the stability of root adhension and physical-chemical change of substrate submerged in water,the thin layer of sponge was the best substrate for V.natans in the indoor experiment.
出处
《浙江农业学报》
CSCD
北大核心
2009年第6期599-603,共5页
Acta Agriculturae Zhejiangensis
基金
中央级公益性科研院所基本科研业务费专项资金项目"精养池塘水质生物净化模式研究"(6-115029)
关键词
基质
苦草
生长
形态
substrate
Vallisneria natans
growth
morphology
