biostudies-literatureUnknown13Kitao MFor a successful natural regeneration of Japanese white birch (<i>Betula platyphylla</i> var. <i>japonica</i>), competitive vegetation should be managed. Here, we clarified how soil water condition modifies the competitiveness of Japanese white birch against perennial weeds, <i>Eupatorium</i> species, based on an ecophysiological approach combining a glasshouse experiment and a field survey. We investigated photosynthetic and growth responses to various water regimes from water deficit to waterlogging (two times-a-week irrigation, three times-a-week irrigation, half waterlogging, and full waterlogging) in pot-grown seedlings of Japanese white birch and the competitive weed <i>Eupatorium makinoi</i>. The ratio of seedling height of Japanese white birch to seedling height of <i>E. makinoi</iFrontiers in plant science835068https://www.ebi.ac.uk/biostudies/studies/S-EPMC8959217biostudies-literaturePhotosynthetic and Growth Responses in a Pioneer Tree (Japanese White Birch) and Competitive Perennial Weeds (<i>Eupatorium</i> sp.) Grown Under Different Regimes With Limited Water Supply to Waterlogging.PMC8959217Harayama HKitao MHashimoto TFuruya NYazaki KTobita HAgathokleous EfalsePhotosynthetic and Growth Responses in a Pioneer Tree (Japanese White Birch) and Competitive Perennial Weeds (<i>Eupatorium</i> sp.) Grown Under Different Regimes With Limited Water Supply to Waterlogging.For a successful natural regeneration of Japanese white birch (<i>Betula platyphylla</i> var. <i>japonica</i>), competitive vegetation should be managed. Here, we clarified how soil water condition modifies the competitiveness of Japanese white birch against perennial weeds, <i>Eupatorium</i> species, based on an ecophysiological approach combining a glasshouse experiment and a field survey. We investigated photosynthetic and growth responses to various water regimes from water deficit to waterlogging (two times-a-week irrigation, three times-a-week irrigation, half waterlogging, and full waterlogging) in pot-grown seedlings of Japanese white birch and the competitive weed <i>Eupatorium makinoi</i>. The ratio of seedling height of Japanese white birch to seedling height of <i>E. makinoi</i2022-01-01T00:00:00Z20222025-08-23T03:05:34.601Z2025-04-06T00:31:43.126ZS-EPMC89592173535612710.3389/fpls.2022.835068