种植密度对2种沉水植物生长繁殖的影响

程花 韩翠敏 林超 李静

摘要 在自然條件下，研究5种不同种植密度（15、30、45、60和75株/m2）对刺苦草和密齿苦草在种群和单株水平上生长繁殖的影响。结果表明，刺苦草和密齿苦草的分株数、扩繁面积、株高、种群生物量、叶绿素含量均随着种植密度的增加先增加后减少，均在种植密度为30 株/m2时达到最大值。刺苦草和密齿苦草的平均单株生物量随着种植密度的增加先减少后增加，均在种植密度为30株/m2时达到最小值。刺苦草的相对生长速率在种植密度为15株/m2时达到最大，密齿苦草的相对生长速率在种植密度为30株/m2时达到最大。刺苦草的可溶性糖含量在种植密度为30株/m2时达到最大值，密齿苦草的可溶性糖含量在种植密度为45株/m2时达到最大值。在2种沉水植被恢复过程中，刺苦草最合适的种植密度为15～30株/m2，密齿苦草最合适的种植密度为30～45株/m2。

关键词 沉水植物;种植密度;刺苦草;密齿苦草;生长繁殖

中图分类号 X 173  文献标识码 A

文章编号 0517-6611（2021）19-0050-05

doi：10.3969/j.issn.0517-6611.2021.19.013

开放科学（资源服务）标识码（OSID）：

Effect of Planting Density on the Growth and Reproduction of Two Submerged Plants

CHENG Hua， HAN Cui-min， LIN Chao et al

（Jiangsu Jiangda Ecological Technology Co.， Ltd.， Wuxi， Jiangsu 214000）

Abstract Under natural conditions， the effects of 5 different planting densities （15， 30， 45， 60 and 75 plants/m2） on the growth and reproduction of  Vallisneria spinulosa  and  Vallisneria denseserrulata  at the population and individual plant levels were studied.The results showed that the number of ramets， expansion area， plant height， population biomass and chlorophyll content of  Vallisneria spinulosa  and  Vallisneria denseserrulata  increased first and then decreased with the increase of planting density， and both reached the maximum when the planting density was 30 plants/m2.The average biomass per plant of  Vallisneria spinulosa  and  Vallisneria denseserrulata  first decreased and then increased with the increase of planting density， and both reached the minimum when the planting density was 30 plants/m2.The relative growth rate of  Vallisneria spinulosa  reached its maximum when the planting density was 15 plants/m2， and the relative growth rate of  Vallisneria denseserrulata  reached its maximum when the planting density was 30 plants/m2.The soluble sugar content of  Vallisneria spinulosa  reached its maximum when the planting density was 30 plants/m2， and the soluble sugar content of  Vallisneria denseserrulata  reached its maximum when the planting density was 45 plants/m2.In the restoration process of the two submerged vegetations， the most suitable planting density of  Vallisneria spinulosa  was 15-30 plants/m2， and the most suitable planting density of  Vallisneria denseserrulata  was 30-45 plants/m2.

Key words Submerged plants;Planting density; Vallisneria spinulosa;Vallisneria denseserrulata; Growth and reproduction