光照强度与氮肥施用水平对麦田杂草婆婆纳和离子草的生长及其竞争关系的影响

通过盆栽试验,研究了光照强度、氮肥施用水平对两种麦田杂草婆婆纳与离子草的生长及其竞争关系的影响。结果表明,在弱光照强度下,婆婆纳、离子草地上与地下部分的生长都相应减弱,但在施用高量氮肥时,婆婆纳植株能萌发更多的叶片以适应弱光照强度条件;增施氮肥,无论是在弱或强光照强度下都有利于婆婆纳的生长,但在弱光照强度下并不显著促进离子草的生长。当土壤中含有丰富的磷、钾养分时,婆婆纳的相对竞争能力要大于离子草,且光照强度与氮肥施用水平不能改变它的竞争优势。

Effects of light intensity and nitrogen application rate on the growth and competition of wheat weeds Veronica agrestis and Chorispora tenella

The pot trials showed that low light intensity decreased the growth of wheat weeds Veronica agrestis and Chorispora tenella,but high nitrogen application rate could make V. agrestis develop more leaves to adapt the weak light condition. Nitrogen application benefited the growth of V. agrestis under high or low light intensity,but had no significant effect on the growth of C. tenella under low light intensity. V. agrestis had a stronger competitive ability than C. tenella when the two weeds grew together on the soil rich in P and K,and the competitive predominance of V. agrestis could not be changed by light intensity and nitrogen application rate.