论文部分内容阅读
豚草是一种危害性恶性入侵杂草,对农业生态系统造成了严重危害。本实验主要研究了燃烧及未燃烧的豚草残留物及其水浸提液对小麦的化感作用,探讨了是否可用燃烧的方法来消除或减弱豚草残留物的化感作用。结果表明:豚草的残留物及其水浸提液均对小麦的早期生长有抑制作用,且残留物水浸提液对苗长的影响较残留物大,说明豚草残留物的化感物质可能是一些水溶性的物质,水的浸提使植物体中的一些化感物质得到了较完全的释放;混有豚草残留物的土壤的理化性质也发生变化,且随着土壤中豚草残留物浓度的增加,土壤的pH、电导率、有机碳含量及酚酸含量均有不同程度的升高,这些因素的综合作用抑制了小麦幼苗的生长,其中酚酸是其主要化感组分之一;通过对燃烧和未燃烧的豚草残留物的化感作用比较研究发现,燃烧过的残留物与未燃烧的残留物对苗长均有显著的抑制作用,但二者之间的差异不显著,因此不能用燃烧的方法消除豚草残留物对本地植物的影响。
Ragweed is a harmful and harmful invasive weed that causes serious damage to the agroecosystem. This experiment mainly studied the allelopathic effects of burning and unburned ragweed residue and its aqueous extracts on wheat and explored whether the combustion method can be used to eliminate or reduce the allelopathic effect of ragweed residue. The results showed that residues of ragweed and its aqueous extract all inhibited the early growth of wheat, and the effect of residual aqueous extract on seedling growth was greater than that of the residue, indicating that allelochemicals of ragweed residue May be some water-soluble substances, the extraction of water so that some allelochemicals in the plant body has been completely released; the physical and chemical properties of the soil mixed with ragweed residue also changed, and with the ragweed The increase of residue concentration, soil pH, electrical conductivity, organic carbon content and the content of phenolic acids were increased to varying degrees, the combined effect of these factors inhibited the growth of wheat seedlings, in which phenolic acids are the main allelochemicals The comparison of the allelopathic effects of the burned and unburned ragweed residues showed that both the burned residue and the unburnt residue had a significant inhibitory effect on the seedling length. However, the difference between the two Not significant, therefore, burning method should not be used to eliminate the impact of ragweed residues on native plants.