种间竞争对小麦生长过程的影响

采用荠菜与春小麦间作的方式,利用对照实验,通过测定小麦生长不同时期的株高、叶面积、分蘖数、过氧化物酶（POD）活性、根冠比等数据,对其平均值进行分析。结果表明：种间竞争对小麦生长过程中的叶面积和分蘖数起抑制作用,而对株高、POD活性和根系生长（根冠比）则随小麦的生长过程的延长由抑制作用转化为促进作用。其原因是荠菜与小麦在空间、光、水、气、养分等资源方面存在竞争关系,这种竞争作用对小麦的生长起抑制作用,小麦为了得到更多的资源用以维持生长,就必须改变自身的形态结构并产生一系列的生理生化变化（如株高、POD活性、根冠比的增大）,以此来提高自己的竞争能力,从而有利于自身更好的生长繁殖。

Effect of Interspecific Competition on the Growth of Wheat

The studies on the effect of interspecific competition on the growth of wheat were carried out by wheat and capsella bursa -pastoris intercropping. The plant height,leaf area index,tiller number,POD enzyme activity ,root and shoot biomass were studied at different growth stages,and analyzed by their averages. The results showed that interspecific competition can restrain the leaf area index and the tiller number,but can accelerate the plant height,POD enzyme activity,root and shoot biomass. The reasons are ...