摘要
在水深为24cm的桶中,以6、12和18cm等3个收割强度对穗花狐尾藻(Myrio-phyllum 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18cm后,植物在41d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6cm或12cm后,穗花狐尾藻在55d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18cm,或11月下旬前第3次收割6或12cm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。
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 ease. 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 （0-41.3%）. The relative increase rate of dry mass declined, while the root/shoot ratio increased with the number of the cuttings.
出处
《生态学杂志》
CAS
CSCD
北大核心
2009年第4期643-647,共5页
Chinese Journal of Ecology
基金
中国科学院知识创新工程重要方向项目(KSCXZ-SW-107-07)
国家“十五”重大科技资助专项(2002AA601021)
关键词
富营养化
收割
穗花狐尾藻
恢复时间
根冠比
eutrophication
apex cutting
Myriophyllum spicatum
recovery time
root/shoot ratio
