Floristic Composition and the Dynamics of Weeds of Sown Grassland in Japan
III. Classification of Weed Communities in Sown Grasslands in Akita and Yamagata Prefectures
1980 Volume 25 Issue 1 Pages 17-23
Details
1980 Volume 25 Issue 1 Pages 17-23
Weed communities on several sown grasslands were examined in Akita and Yamagata prefectures of the northern Tohoku district. Weeds, the most frequently observed in the district were Rumex obtusifolius, Rumex acetosella, Plantago asiatica, Miscanthus sinensis, Erigeron canadensis, Petasites japonicus var. giganteus and Polygonum longisetum. Weed communities on grassland in Akita and Yamagata prefectures were classified as follows:
I. Amaranthus lividus type (Differential species; Amaranthus lividus and Setaria faberi).
1. Amaranthus retroflexus-community (Differential species; Amaranthus retroflexus, Commelina communis, Portulaca oleracea, Polygonum aviculare, Chenopodium album and Stellaria neglecta).
2. Rumex acetosella-community (Differential species; Rumex acetosella and Plantago asiatica).
II. Carex albata type (Differential species; Carex albata, Polygonum hydropiper and Juncus effusus var. decipiens).
3. Typical community.
4. Scirpus wichurae-community (Differential species; Scirpus wichurae and Juncus tenuis).
III. Rumex obtusifolius type (Differential species; Rumex obtusifolius).
5. Typical community.
6. Plantago asiatica-community (Differential species; Plantago asiatica, Poa annua and Artemisia montana).
7. Erigeron canadensis-community (Differential species; Erigeron canadensis).
8. Pteridium aquilinum var. latiusculum-community (Differential species; Pteridium aquilinum var. latiusculum).
IV. Rumex acetosella type (Differential species; Rumex acetosella, Plantago lanceolata, Anthoxanthum odoratum and Hypochoeris radicata).
9. Rumex obtusifolius-community (Differential species; Rumex obtusifolius).
10. Typical community.
11. Gnaphalium japonicum-community (Differential species; Gnaphaliumm japonicum).
12. Petasites japonicus var. giganteus-community (Differential species; Petasites japonicus var. giganteus).
13. Bryum argenteum-community (Differential species; Bryum argenteum).
V. Petasites japonicus var. giganteus type (Differential species; Petasites japonicus var. giganteus and Epilobium cephalostigma).
VI. Bryum argenteum-Hypnum plumaeforme type (Differential species; Bryum argenteum and Hypnum plumaeforme).
VII. Erigeron canadensis type (Differential species; Erigeron canadensis).
VIII. Miscanthus sinensis type (Differential species; Miscanthus sinensis).
