关键词: 文冠果种群, 有性繁殖, 无性繁殖, 种群更新

Abstract: In order to explore the change pattern of mineral elements from hair, serum, feces and urine on grazing sheep of Qinghai-Tibet Plateau, the contents of Cu, Mn, Zn, Mg, Se and Mo in hair, blood, feces and urine collected in spring, summer and autumn from sheep on the southern shore of Qinghai Lake were measured, and the correlations of different elements in the same samples and the same elements in different samples were calculated. All elements showed no significant difference except the Mn and Se in serum among seasons, and all elements in urine, hair and feces showed significant difference except Se in hair and Zn in feces (P<0.05). These results showed that the content of each element in serum was much easier to keep constant than that in hair, feces and urine. From the correlation of different elements in the same samples, the positive relationship in spring was more than that in summer or autumn, and the related degree of each element in feces was higher than others, and the Mg had more synergic effect with other elements while the Se had less. From the correlation of the same element in different samples, the correlation of each element between urine and other sample was of significance. Zn and Se had a tight relationship with other elements while Mo did not. In conclusion, the urine is recommended as an index to monitor the grazing sheep minerals and Se should be separated from other elements to avoid antagonism when adding minerals in spring.

Key words: Xanthoceras sorbifolia population, sexual propagation, asexual propagation, population regeneration.