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Inhibition of the regeneration of Japanese black pine (Pinus thunbergii) by black locust (Robinia pseudoacacia) in coastal sand dunes
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Inhibition of the regeneration of Japanese black pine (Pinus thunbergii) by black locust (Robinia pseudoacacia) in coastal sand dunes
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Inhibition of the regeneration of Japanese black pine (Pinus thunbergii) by black locust (Robinia pseudoacacia) in coastal sand dunes
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Journal Article
Inhibition of the regeneration of Japanese black pine (Pinus thunbergii) by black locust (Robinia pseudoacacia) in coastal sand dunes
2007
Overview
Pine forests are declining because of pine wilt disease and Robinia pseudoacacia, a nitrogen-fixing species, is dominating coastal forests along the Sea of Japan. We examined the effects of R. pseudoacacia on the regeneration of a native pine species, Pinus thunbergii. Two 200 m² plots were set up at the border of a P. thunbergii and R. pseudoacacia-dominated area in a coastal forest. We conducted monthly censuses of emergence, distribution and survival of pine seedlings in the plots from May 2003 to December 2004. Light intensity and soil properties were also measured to analyze the relationships between the survival of pine seedlings and environmental conditions using the Mantel test and the structural equation model. Pinus thunbergii seedlings emerged in spring-early summer and in late autumn. Survival of pine seedlings in the R. pseudoacacia-dominated subplots was less than half that in the pine-dominated subplots. Survival of pine seedlings emerging in May 2003 was significantly reduced by the lower light intensity and higher soil nitrogen in R. pseudoacacia-dominated subplots. The tendency was the same for seedlings emerging from April to May 2004. We concluded that R. pseudoacacia reduced the intensity of light during the growing season and increased the nitrogen content of soil, which resulted in inhibition of the natural regeneration of P. thunbergii.
