Abstract: 【Objective】 This project aim to explore the response of the population and desert community quantitative characteristics to grazing exclusion, and make clear its dynamic changes in different growth periods in the hope of providing a theoretical basis for the scientific grassland management.【Method】The important value of eco-economic categories, population and desert community characteristics of Seriphidium borotalalense after grazing exclusion four years in different growth periods (May, July and September) were measured by using the field investigation sampling method.【Result】(1) The important values of semi shrub and perennial herbs in May and July in response to grazing exclusion were not significant, but in grazing exclusion areas, they were significantly higher and lower than grazing areas' 6.5%, 93.8% in September (P<0.05); (2) Compared with the grazing area, population height significantly was increased by 23.1% in July, the coverage of population and community were significantly increased by 43.9% and 57% respectively, and their biomass were significantly increased by 119.9% and 51%.【Conclusion】Short-term grazing exclusion can increase coverage and biomass of population and desert community of S. borotalalense in initial grazing period, thus improving the quality of grassland.

Key words: grazing exclusion; Seriphidium borotalalense; population characteristics; community characteristics

摘要： 【目的】研究荒漠建群种种群和群落数量特征对禁牧的响应规律,明确其在不同生长季时期的动态变化,为草地的科学经营和管理提供理论依据。【方法】采用野外调查取样的方法,以博乐绢蒿荒漠为研究对象,对禁牧4 a后不同生长季时期(5、7和9月)植被生态经济类群重要值、博乐绢蒿种群和群落特征的测定分析。【结果】(1)半灌木、多年生草本的重要值在5和7月对禁牧的响应不明显,但在9月禁牧区分别显著高于和低于放牧区的6.5%、93.8%(P<0.05);(2)与放牧区相比,禁牧区的种群高度在7月显著增加23.1%,5月禁牧区的种群和群落盖度分别显著增加43.9%、57.0%,生物量分别显著增加119.9%、51.0%。【结论】短期禁牧可增加始牧期博乐绢蒿种群和荒漠群落盖度、生物量,改善草地质量。

关键词: 禁牧, 博乐绢蒿, 种群特征, 群落特征