扎龙自然保护区不同生境条件下羊草种群构件的年龄结构

Age structure of Leymus chinensis population modules in different habitats of Zhalong Nature Reserve

对黑龙江国家级自然保护区扎龙湿地不同生境条件下羊草种群构件的年龄结构进行了研究。结果表明,在7月末羊草种群的腊熟期,3种生境种群分蘖株均由3个龄级组成,林间风沙土生境为1 080株.m-2,沙土生境为1 290株.m-2,草甸土生境为1 011株.m-2,均以1龄和2龄级分蘖株占绝对优势,3龄级分蘖株所占比例甚小,呈增长型年龄结构。根茎均由4个龄级组成,以沙土生境最多,累积长度为8 000 cm.m-2,草甸土生境最少,为6 948 cm.m-2,均呈增长型年龄结构。各生境根茎物质的储量随着龄级的升高而降低。芽均由4个龄级组成,其数量以草甸土生境最大,为2 279个.m-2,沙土生境次之为2 113个.m-2,林间风沙土生境最少为1 410个.m-2,均呈增长型年龄结构。

The study on the age structure of Leymus chinensis population modules in three habitats of Zhalong Nature Reserve showed that at the waxen maturity stage of the population(by the end of July),the tillers were composed of three age classes, with the 1st and 2nd age classes the dominant and the 3rd age class the least,and presented in an increasing age structure.There were(1 080) tillers·m^(-2) in inter-forest sand soil,(1 290) tillers·m^(-2) in sand soil,and(1 011) tillers·m^(-2) in meadow soil.The rhizomes ...