SPECIAL ISSUE “ Nonnative Species and Vegetation Management ” Evaluation of the effect of alien plants on the indigenous grassland community on the river bank of the Tone canal

AIZAWAi Akihito, TANAKA Aiko, KOBAYASHI Hirokazu, KOBAYASHI Tatsuaki

doi:10.7211/jjsrt.40.527

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特集「外来種と植生管理」利根運河堤防部における在来草原性植物群落に対する外来植物の影響評価
利根運河堤防部における在来草原性植物群落に対する外来植物の影響評価
リコンウンガテイボウブニオケルザイライソウゲンセイショクブツグンラクニタイスルガイライショクブツノエイキョウヒョウカ
SPECIAL ISSUE “ Nonnative Species and Vegetation Management ” Evaluation of the effect of alien plants on the indigenous grassland community on the river bank of the Tone canal

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Description

To evaluate the effect of the alien plants on indigenous grassland ecosystem on the riverbank of the Tone canal, we did vegetation survey using random sampling method and used TWINSPAN and statistical modeling. The TWINSPAN divided the vegetation into two alien communities and two indigenous communities. The result of the statistical modeling showed that an alien indicator species Solidago altissima affected on the indigenous species only in population level scale (5 m × 10 m) but not in individual level scale (50 cm × 50 cm), meanwhile another alien indicator species Sorghum halepense f. muticum showed strong and multiscale effect on the indigenous species. That means S. altissima affect indigenous species in large scale, but inside the population of the S. altissima, there can be some indigenous species inside. Thereby, regulation of the density of the S. altissima (ex: shifting the mowing season) may lead to the expansion of the indigenous species. To manage alien plants in this riverbank, we must reference to the community types divided by TWINSPAN and make an effort to bring down the density of the S. altissima and control expansion of the S. halepense f. muticum. Additionally, we recommend our survey method to apply monitoring not only for checking alien species reduction but also for confirming the indigenous ecosystem recovery.

Journal

Journal of the Japanese Society of Revegetation Technology

Journal of the Japanese Society of Revegetation Technology 40 (4), 527-533, 2015

JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY

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