Effects of Light Intensity and Phosphorus Application Rate on Competition Between Veronica Agrestis and Chorispora Tenella

Pot experiments were carried out to study effects of light intensity and phosphorus application rate on growth and competition of Veronica agrestis and Chorispora tenella.Results showed that low light intensity hindered growth of V.agrestis and C.tenella,but the former could develop more leaves to adapt to the weak light condition.Phosphorus application benefited growth of V.agrestis under either high or low light intensity,but the effect on C tenella was not significant under low light intensity;Comparison between the two showed that C.tenella was more tolerant to low soil P supply,and V.agrestis to low light intensity.So,when soil P supply was lower,C.tenella was more competitive than V.agrestis under high light intensity.Then,when soil P supply was higher,V.agrestis was more competitive than C.tenella under any light intensity.