Influence of the difference of management on the weed vegetations around paddy fields in valley in hill land

DOI Web Site 4 Citations 23 References
  • Nemoto Masayuki
    Faculty of Regional Environment Science, Tokyo Univ. of Agriculture
  • Otsuka Hiroo
    Graduate School of Landscape Architecture, Tokyo Univ. of Agriculture

Bibliographic Information

Other Title
  • 管理条件の違いが谷戸地形における水田周辺の雑草群落に及ぼす影響
  • カンリ ジョウケン ノ チガイ ガ ヤト チケイ ニ オケル スイデン シュウヘン ノ ザッソウ グンラク ニ オヨボス エイキョウ

Search this article

Abstract

The vegetations on footpaths, levees and abandoned paddy located within the same valley were compared with each other, in an attempt to clarify the ecological properties of the weed communities which have been exposed to the continuous and periodic disturbance related to rice cropping such as trampling, cutting by farmers. The sample consisting of 119 species in 132 quadrats were classified by TWINSPAN. The stand groups containing Zoysia japonica, Imperata cylindrica and Miscanthus sacchariflosus corresponded to the footpath, the levee and the abandoned paddy communities, respectively. The above-ground parts of the vegetation in the footpath that frequently destructed was dominated by small creeping weeds like Z. japonica, Triforium repens, and moreover tree seedlings and tall-growing competitive erect and tussock-form weeds were involved in this vegetation. I. cylindrica super-dominated on the levees where cutting had been practiced once a year. In abandoned paddy, M. sacchariflorus formed the framework of this community, and short-growing weeds like Oenanthe javanica, Equisetum arvense and climbers coexisted. Abandoned paddy may not be suitable for germination of tree seeds dispersing from surrounding forest because of the high humidity. Therefore, weed community on the humid abandoned paddy seems to be relatively stable. To characterize the successional stability of vegetation, Index of Vegetation Condition (IVC) was defined for each stand based on the difference of relative plant height of each component species with dominant species of the stand. This index suggested that the stability of weed vegetation in the studied area does not correspond the values of diversity index (H′). The IVC value decreased with increasing intensity of disturbance in this valley.

Journal

Citations (4)*help

See more

References(23)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top