CHANGES OF FLOWERING CHARACTERISTICS OF A RIPARIAN CHASMOPHYTE, SPIRAEA THUNBERGII SIEB.

• 芦澤 和也

  明治大学 研究・知財戦略機構

• 倉本 宣

  明治大学 農学部

Bibliographic Information

Other Title

• 河岸の岩場に生育するユキヤナギの開花の経年変化

Abstract

 Spiraea thunbergii Sieb. grows naturally in rocky areas along rivers. This species is listed as 'vulnerable' or 'near threatened' in some regional red data books for Japan. To examine the effects of flooding on the flowering of S. thunbergii, we investigated the flowering of S. thunbergii between 2008 and 2010 in areas that were flooded by the ninth typhoon in 2007.<br> We examined the presence or absence of flowers; plant length; the numbers of flowers, old stems, and new sprouts; and relative elevation of 175 individuals in four populations along the Tama River every April. We created classification and regression trees to examine the parameters related to changes in the presence or absence of flowers. The proportion of individuals that bloomed decreased from 2008 to 2009 in south-facing populations on the left bank, but increased from 2008 to 2010 in north-facing populations on the right bank. In north-facing populations on the right bank, many individuals produced more flowers each year. Parameters that affected the change in the presence or absence of flowers from 2008 to 2009 were the number of old stems in 2009, length in 2009, direction of slope, and number of old stems in 2008. Parameters that affected the change from 2009 to 2010 were the number of old stems in 2009, length in 2009, and number of new sprouts in 2008. In this study, the change in the flowering of S. thunbergii differed between north- and south-facing populations. The main parameter that affected the change in flowering was the number of old stems. We found more new sprouts in 2008 compared to in 2009 and 2010. These results suggest that flooding affected the flowering and regeneration of S. thunbergii.

Journal

• Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)

  Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 67 (6), II_57-II_62, 2011

  Japan Society of Civil Engineers

Keywords

• chasmophyte
• Tama River
• slope
• flooding
• sprouting

Details

• CRID: 1390282680332999040
• NII Article ID: 130004560251
• DOI: 10.2208/jscejer.67.ii_57
• ISSN: 21856648
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed