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Research Paper : Effects of phosphorus and light intensity on the growth and competition of the two weed species Veronica persica and Chorispora tenella
분야 농학 > 임학
저자 ( Li Chu Yin ) , ( Jian Xin Luo ) , ( Lan Fang Luo ) , ( Gui Xian Xie )
발행기관 한국잡초학회
간행물정보 Weed Biology and Management 2012년, 제12권 제1호, 22~28쪽(총7쪽)
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영문초록
Veronica persica Poir. (Persian speedwell) is an invasive alien weed species in the upland soils throughout China. Its dominance in weed flora could be alleviated by Chorispora tenella (Pall.) (tender chorispora) in P-poor soils and in an intense light environment. Here, three experiments in growth chambers were carried out in order to explore the effect of P and light intensity on the growth and competition of V. persica and C. tenella, the pH value in their rhizospheres, and the kinetic parameters (Km and Vmax) of the H2PO4 - uptake by the two weed species. The ANOVA results showed that the light intensity and P level in the soil obviously influenced the growth of the two weed species. However, the effect of the P level in the soil was greater for V. persica and the effect of the light intensity was greater for C. tenella. The restriction of the growth of V. persica by a low P level in the soil was much more than that of C. tenella, but it was reversed in the two species in relation to a low light intensity. In addition, the pH was lower in the rhizosphere of C. tenella after the P-deficient treatment and there was a lower Km in the uptake of H2PO4 - than for V. persica, suggesting that C. tenella could adapt to a low-P environment more easily. In conclusion, C. tenella growing together with V. persica had a competitive advantage under high-light-intensity and low-P-level conditions, but it lost its advantage with an increase in P fertilization and a decrease in light intensity.
 
 
competition, kinetic parameters, light intensity, pH, phosphorus
 
 
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