1. The productive structures of
Miscanthus sinensis- and
Arundinella hirta-type communities in Kirigamine grassland, Nagano Prefecture, were investigated in August of 1959, using the stratified-clip method. In the former, the upper layer was mostly occupied by
M. sinensis and the lower layer by other forbs, showing marked vertical stratification (Fig. 1-B). In the latter, no clear stratification was found and greater part of the foliage was distributed in the lowermost layer, 0-20cm above ground-level (Fig. 1-A).
2. Above-ground standing crop of the whole vegetation began to increase from early May and reached their maxima by late August (
Arundinella type, ca. 270g/m
2) or early September (
Miscanthus type, ca. 380g/m
2), then decreased rapidly towards the end of growing season in November (Fig. 2).
Underground standing crop ranged from 487 to 717g/m
2 for
Miscanthus type, and from 402 to 502g/m
2 for
Arundinella type, showing no clear seasonal trends during the growing period (Table 1). Mean value in winter of 600g/m
2 was observed in
Miscanthus-type community.
Amount of litter was maximal at the end of growing season, in October or November, ca. 430g dry weight/m
2 for
Miscanthus type and ca. 200g/m
2 for
Arundinella type.
3. Characteristic seasonal change in above-ground standing crop was shown for each constituent species of the communities (Fig. 3).
Miscanthus sinensis assumed the largest proportion (about 40-60%) in total aboveground standing crop of
Miscanthus-type community throughout the growing season, and it had a seasonal peak of ca. 240g dry weight/m
2 in early September. Compositae species, such as
Aster, Solidago, and
Anaphalis, followed
M. sinensis in rank of standing crop.
In
Arundinella-type community, grasses made the largest contribution to aboveground standing crop especially in late August, when the seasonal maximum, ca. 180g dry weight/m
2, of grasses was attained. Liliaceae species, and
Scabiosa japonica showed their seasonal maxima in June and in August, respectively.
Seasonal peaks of the top weight/total plant weight ratio (%) were observed in late June for Liliaceae species, in late July for Compositae species, in August for
Scabiosa japonica, and in late August or later for
Miscanthus sinensis and other grasses (Fig. 4).
4. Above-ground standing crops of these communities were compared with those of other Japanese herbaceous communities (Table 3).
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