Weed vegetation of small cavities formed in paved roads
2004
Suto, Y. (Utsunomiya Univ. (Japan)) | Ogasawara, M. | Nishio, T. | Ichizen, N.
Summary The present study was conducted to clarify the ecological characteristics of the weed vegetation of small cavities formed in gaps at junctions of curbstones and sidewalks. Weed vegetation of the cavities was investigated at 78 points from March 18 to April 25 (spring) and at 71 points from October 17 to October 29 (autumn) in 2002 in Utsunomiya City, Tochigi Pref. The average (SE) width (depth) of cavities was ll.8 (=+-l.1) mm (77.2 (=+-7.4) mm), and the pH of the soil contained in the cavity was 7.58 (=+-0.06). The weed vegetation was analyzed in terms of the frequency of occurrence, summed dominance ratio, life form, and ratio (%) of naturalized weed. The vegetation of the cavity consisted of 74 weed species belonging to 25 families in total for spring and autumn. Eight weed species, Cerastium glomeratum, Arenaria serpyllifolia, Setaria viridis, Euphorbia supina, Eragrostis multicaulis, Eleusine indica,Poa annua and Artemtsia princeps dominated, and Arenaria serpyllifolia was nominated as a characteristics species of the vegetation of the cavity.From the point of floristic composition, weed vegetation of the cavities differs from the floristic compositions of paddy fields, upland fields and turf. However, in terms of life form,vegetation of the cavities included a large number of Th-R sub (5) -D sub (4) type weeds (therophyte,without connection to underground and the ground, and seed spraying by gravity or the wind), as in arable land. The ratio (%) of naturalized weeds in spring (autumn) was 38. 8% (37.5%).
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