山間地における放棄水田と畦畔のり面の植生動態

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Successional patterns of vegetation on abandoned paddy fields and their levee slopes were analyzed in mountainous regions of central Japan. The samples were classified into two types, the Miscanthus sinensis type and Phragmites australis type, at the first division level of TWINSPAN, based on the dominant species regardless of location or fallow duration. The M. sinensis type occurred at dry sites on convex slopes and the P. australis type at wet sites on concave slopes. M. sinensis and P. australis have dominated paddy field stands for 20 years. Both the clump size and litter accumulation of M. sinensis increased with fallow duration, and this litter effect would be one of the important factors related to the long-term dominance of M. sinensis. During 20 years of fallow in the M. sinensis type, however, woody species invaded the gaps among the M. sinensis clumps. As individuals of M. sinensis become clumped and form heterogeneous spatial patterns including gaps, seeds dispersed from the levee slope vegetation and surrounding forests and /or buried seeds may establish themselves. On levee slopes, most stands were of the M. sinensis type, and dominated by woody species except in those that had lain fallow for three years. These results suggest that the succession of abandoned paddy fields in the surveyed regions is affected by soil moisture conditions related to micro-landform, litter accumulation, the growth form of dominant species and the levee slope vegetation as a seed source.
日本生態学会の論文
1996-04-25

山間地における放棄水田と畦畔のり面の植生動態

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