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Volume 49 (2004)
- Issue 4 Pages 277-
- Issue 3 Pages 169-
- Issue 2 Pages 95-
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Volume 49, Issue 3
Displaying 1-8 of 8 articles from this issue
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Masayuki HATTORI, Syuntaro HIRADATE, Hiroshi ARAYA, Eiji NISHIHARA, Yo ...2004 Volume 49 Issue 3 Pages 169-183
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSAllelopathic activity of 4 different types of weeds-Japanese native weeds (38 species of 18 families), naturalized or established weeds in Japan (30 species of 12 families), newly imported weeds (18 species of 8 families, originating as feed-mix in imported feeds), and Brazilian weeds (55 species of 17 families, considered potentially invasive), and total 129 species of 25 families were evaluated by “Plant-Box” method using lettuce as a test plant.
Results showed that the imported weeds had not always lower allelopathic activity than that of naturalized or established ones. However, several Brazilian weeds showed high allelopathic activities in comparison to native, naturalized or established weeds. The velvetleaf (either the imported or endemic type) showed strong phytotoxic effect against lettuce radicle growth. In case of common lambsquarters, strong allelopathic activities were observed on the imported type and that with Brazilian origin, but allelopathic activity of those phenotypes that already established in Japan was not prominent. These results suggest that allelopathic activity might depend on their origin of each phenotype. This study suggests that some potentially invasive weeds, as well as some imported weeds, were highly allelopathic, and could possibly become a threat to Japanese vegetation, if they invade, and establish in Japan.View full abstractDownload PDF (1923K) -
Masayuki Nemoto, Hiroo Otsuka2004 Volume 49 Issue 3 Pages 184-192
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThe 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.View full abstractDownload PDF (1167K) -
Hiroshi Matsumoto2004 Volume 49 Issue 3 Pages 193-201
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
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T. IWASE2004 Volume 49 Issue 3 Pages 202-205
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
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Shigeya Yamakawa, Kazuyuki Itoh2004 Volume 49 Issue 3 Pages 206-219
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
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Takafumi Takeshita2004 Volume 49 Issue 3 Pages 220-230
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
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Reiichi Miura2004 Volume 49 Issue 3 Pages 231-232
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
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Masatoshi Gohbara, Masayuki Hattori, Shizuko Ishikawa, Matsuo Itoh, Ak ...2004 Volume 49 Issue 3 Pages 239-248
Published: September 30, 2004
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (1439K)
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