| [allelopathy of aqueous extract from ligularia virgaurea, a dominant weed in psychro-grassland, on pasture plants]. | ligularia virgaurea is a noxious weed widely distributed in the alpine grassland of east qinghai-tibet plateau of china. this paper studied the allelopathy of its aqueous extract on the pasture plants festuca sinensis, bromus magnus, elymus nutans, poa annua, and f. ovina in the region. the mean response index (ri) values of the pasture plants were calculated, and used to quantitatively assess the allelopathic sensitivity of the receptors at three levels, i. e., growth items, development stages, ... | 2006 | 16883813 |