程花 韓翠敏 林超 李靜

摘要 在自然條件下，研究5種不同種植密度（15、30、45、60和75株/m2）對刺苦草和密齒苦草在種群和單株水平上生長繁殖的影響。結果表明，刺苦草和密齒苦草的分株數(shù)、擴繁面積、株高、種群生物量、葉綠素含量均隨著種植密度的增加先增加后減少，均在種植密度為30 株/m2時達到最大值。刺苦草和密齒苦草的平均單株生物量隨著種植密度的增加先減少后增加，均在種植密度為30株/m2時達到最小值。刺苦草的相對生長速率在種植密度為15株/m2時達到最大，密齒苦草的相對生長速率在種植密度為30株/m2時達到最大。刺苦草的可溶性糖含量在種植密度為30株/m2時達到最大值，密齒苦草的可溶性糖含量在種植密度為45株/m2時達到最大值。在2種沉水植被恢復過程中，刺苦草最合適的種植密度為15～30株/m2，密齒苦草最合適的種植密度為30～45株/m2。

關鍵詞 沉水植物;種植密度;刺苦草;密齒苦草;生長繁殖

中圖分類號 X 173? 文獻標識碼 A

文章編號 0517-6611（2021）19-0050-05

doi：10.3969/j.issn.0517-6611.2021.19.013

開放科學（資源服務）標識碼（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