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收割对穗花狐尾藻生长的影响

左进城1,2;苗凤萍3;王爱云1;赵爱芬1;王仲礼1;吴振斌2   

  1. 1鲁东大学生命科学学院, 山东烟台 264025;2中国科学院水生生物研究所淡水生态与生物技术国家重点实验室, 武汉 430072;3中国科学院烟台海岸带可持续发展研究所, 山东烟台 264000
  • 收稿日期:2008-08-12 修回日期:1900-01-01 出版日期:2009-04-10 发布日期:2009-04-10

Effects of apex cutting on re-growth of Myriophyllum spicatum cultured in buckets.

ZUO Jin-cheng1,2;MIAO Feng-ping3;WANG Ai-yun1;ZHAO Ai-fen1;WANG Zhong-li1;WU Zhen-bin2   

  1. 1College of Life Sciences, Ludong University, Yantai 264025, Shandong, China;2State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;3Yantai Institute of Coastal Zone Research for Sustainable Development, Chinese Academy of Sciences, Yantai 264025, Shandong, China
  • Received:2008-08-12 Revised:1900-01-01 Online:2009-04-10 Published:2009-04-10

摘要: 在水深为24 cm的桶中,以6、12和18 cm等3个收割强度对穗花狐尾藻(Myriophyllum spicatum)进行了连续4次收割实验,研究了收割强度、收割频次及收割季节对穗花狐尾藻生长恢复的影响。结果表明:8月下旬第1次收割18 cm后,植物在41 d恢复,但产生分枝较少,影响了植物的无性繁殖;9月下旬之前,前2次收割6 cm或12 cm后,穗花狐尾藻在55 d恢复,并能产生较多的分枝,而且条枝总长有明显的增加,表明穗花狐尾藻的无性繁殖没有受到抑制;10月初第2次收割18 cm,或11月下旬前第3次收割6或12 cm后,植物均能安全越冬,恢复时间至少4个月以上;各次收割后,穗花狐尾藻的新生枝条主要从切割处萌发(至少40%以上),其次是从基部萌发(0~41.3%);随着收割次数增加,干质量的相对增长率下降,而根冠比增加。

关键词: 水稻, 自由空气CO浓度增加(FACE), P积累, P分配, P效率

Abstract: Four consecutive cutting experiments were conducted to investigate the effects of cutting intensity, cutting frequency, and cutting date on the re-growth of Myriophyllum spicatum. The M. spicatum plants were cultured in buckets with a water depth of 24 cm, and three cutting intensities were taken at 6, 12 and 18 cm from the apex of the plants, respectively. The results showed that after the first cut-off at 18 cm from the apex in late August, the plants recovered after 41 days, but fewer lateral shoots generated. Therefore, the asexual reproduction would be negatively affected in this case. In contrast, the plants subjected to two initial cut-offs at 6 or 12 cm from the apex before late September recovered after 55 days, with more lateral shoots generated and with significant increase in total shoot length, which meant that the asexual reproduction would not be inhibited. After a second cut-off at 18 cm in early October or a third cut-off at 6 or 12 cm before late November, all the plants could survive in winter, with a recovery span of at least 4 months. The new shoots after each cutting were generated mostly from the cut place (over 40%), and secondly from turions (0〖KG-*2〗-〖KG-*7〗413%). The relative increase rate of dry mass declined, while the root/shoot ratio increased with the number of the cuttings.

Key words: Oryza sativa, Free-air CO2 enrichment (FACE), Phosphorus uptake, Phosphorus distribution, Phosphorus efficiency