阿。。。求助~~

Solidago canadensis in the course of the investigation found that the growth in intensive Solidago canadensis-growing areas, underground almost no other weeds. On the one hand, because of its strong growth advantage, and other water weeds fight, fight fat, vying for sunlight; on the other hand is due to Solidago canadensis some of the roots secrete substances, these substances can inhibit the growth of sugar maple seedlings, but also inhibit own herbs, including germination. In Denmark, a study showed that the root system is the presence of acetylene gas, it is estimated that also inhibit the growth of other species. Solidago canadensis of whether there is a sense on the role extent effective parts in any place, the secretion of the active ingredients of secondary compounds what is material, these issues have to be further analysed. If indeed the role of the flu, the analysis may be used for the active ingredients of the new plant herbicide development.