Abstract: Excessive grazing and irrational grazing system had resulted in the severe degradation of sagebrush desert in Xinjiang and restricted the development of seasonal stock raising in Xinjiang. In order to understand the growth law of individual module of dominant species and guide the reasonable utilization and reversion of sagebrush desert grassland in Xinjiang, the amount and yield dynamics of individual modules of Seriphidium transiliense in sagebrush desert grassland was investigated in field and laboratory in 2005 and 2006. Results show: height and tiller weight of S.transiliense were linearly increased during entire growing season, and emerged in a ‘rapid-slow-rapid’ shape on rate of growth; the tiller quantity and leaf biomass had "increase-reduce-increase" and "double growth peaks" in curve shapes, respectively; the root biomass had no significant difference and averaged 6.1 g per individual plant; both the whole yield and aboveground biomass of S. transiliense emerged in S shape; the fluctuations of modules between 2005 and 2006 was probable related to the local conditions of moisture and temperature. Desert grassland of S. transiliense was suitable for grazing from April to June in spring and from September to October in fall during the whole growing season.

Key words: Seriphidium transiliense, Modules, Biomass, Dynamical measuring

摘要： 为确定新疆蒿属荒漠草地建群种个体构件的自然生长规律,2005-2006年采用实地调查与室内分析相结合的方式,连续两年对蒿属荒漠草地建群种伊犁绢蒿(Seriphidium transiliense)个体构件数量及产量进行动态监测。结果表明:伊犁绢蒿在整个生长季内株高和枝条重量基本呈线性生长,增长速度呈"快-慢-快"的趋势;枝条数量及叶片重量分别呈"升高-降低-升高"双峰曲线形式;根重变化不明显,均在6.1g/株左右;从整体上看,伊犁绢蒿地上部分和个体总产量均呈"S"型变化;各构件在年度之间存在一定的波动性,可能与当年的水热条件相关;从利用上看,伊犁绢蒿荒漠草地适宜在4-6月、9-10月进行放牧。

关键词: 伊犁绢蒿, 构件, 生物量, 动态监测