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不同水体条件和基质类型对苦草(Vallisneria spiralis L.)种子萌发的影响

韩翠敏1,胡庚1,武涛1,游文华2**   

  1. 1江苏江达生态科技有限公司, 江苏无锡 214061; 2江苏大学环境与安全工程学院, 江苏镇江 212013)
  • 出版日期:2014-06-10 发布日期:2014-06-10

Effects of water quality and substrate type on seed germination of Vallisneria spiralis L.

HAN Cui-min1, HU Geng1, WU Tao1, YOU Wen-hua2**   

  1. (1The Ecological Science and Technology Limited Company of Jiangda, Wuxi 214061, Jiangsu, China; 2
    School of the Environment and Satety Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China)
  • Online:2014-06-10 Published:2014-06-10

摘要: 研究了不同水体条件和基质类型对苦草(Vallisneria spiralis L.)种子萌发的影响,探讨富营养化水体中苦草种子的萌发策略。结果表明:在自然温度和光照条件下,苦草种子的萌发率为40%~69%,在不同水体条件下没有显著差异;相比自来水和贡湖水,苦草种子在太湖水中有更高的累积萌发率和最终萌发率、更快的萌发速率和更短的平均萌发时间。基质类型对苦草种子萌发有显著的影响,黄土中种子萌发情况最好,河沙中萌发情况最差;在黄土基质中,苦草种子最终萌发率比河沙基质中高约20%,萌发速率是河沙基质的2倍,且平均萌发时间比河沙基质短14 d。不同萌发介质条件下,苦草种子在水中的萌发率(64%)显著高于基质(50%),而萌发效率却显著低于后者(萌发速率低5%,平均萌发时间多11 d)。研究结果为富营养化湖泊中利用苦草种子育苗进行植被生态修复提供了理论依据。

关键词: 沟垄二元覆盖技术, 旱作区

Abstract: The effects of water quality and substrate type on the seed germination of Vallisneria spiralis L. were investigated, with the goal to explore its strategies of seed germination under eutrophic water condition. The results showed that the seed germination percentage of V. spiralis was 40%-69% under natural temperature and light conditions. Water bodies had little effect on the seed germination of V. spiralis. However, compared to the other two waters, the cumulative germination percentage and total germination percentage were relatively higher, the germination rate was faster and the mean germination time was shorter in the water of Taihu. Substrate types significantly affected the seed germination of V. spiralis, which was the best in the loess and the worst in the sand. In the substrate of loess, the total germination percentage was 20% higher, the germination rate doubled, and the mean germination time was 11 days shorter than those in the sand. The seed germination percentage in the water (64%) was greatly higher than in the sediment (50%), while the seed germination efficiency was significantly lower in the water than in the sediment (germination rate 5% lower and mean germination time 11 days longer). This study provides a theoretical basis for vegetation restoration in eutrophic lakes using the V. spiralis seeds.

Key words: dry farming regions, dual-mulching of ridges and furrows.