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2010年8月,通过单位面积取样的方法,对新疆伊犁草甸和干旱两种生境无芒雀麦(Bromus inermis)自然种群分蘖株、根茎、冬性苗和芽的年龄结构进行了分析,旨在揭示无芒雀麦种群在不同生境条件下的繁殖潜力。结果表明,无芒雀麦种群分蘖株、根茎、冬性苗和芽在两种生境中均以最低的两个龄级占优势。种群生殖分蘖株有3个龄级,营养分蘖株、根茎、冬性苗和芽均有4个龄级;根茎分蘖节最多繁殖4个世代,最多可存活5个生长季。种群的分蘖株数量、芽数量和根茎长度为草甸生境>干旱生境,冬性苗数量为草甸生境<干旱生境。营养分蘖株和冬性苗数量为1龄>2龄>3龄>4龄,芽数量为0龄>1龄>2龄>3龄。两种生境下,无芒雀麦种群分蘖株、根茎、冬性苗和芽等构件均呈增长型年龄结构。
In August 2010, the age structure of tillers, rhizomes, winter seedlings and shoots of natural populations of Bromus inermis in two habitats of meadow and arid in Xinjiang were analyzed by sampling per unit area. Reveal the reproductive potential of the Bromus inermis population under different habitat conditions. The results showed that the tillers, rhizomes, winter seedlings and buds of Bromus inermis had the lowest two age classes in both habitats. There are 3 age classes in population reproductive tillers. There are 4 age classes in nutrient tillers, rhizomes, winter seedlings and buds. The rhizome tillers reproduce up to 4 generations and can survive for up to 5 growing seasons. The number of tillers, the number of buds and the length of rhizomes in the population were the meadows> the arid habitats, and the number of the winter seedlings was a meadow habitat 2 years> 3 years> 4 years, and the number of buds was 0 years> 1 year> 2 years> 3 years. Under the two habitats, the components of tillering, rhizome, winter seedlings and buds of M. przewalskii showed an increasing age structure.