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对伊犁河谷昭苏县杨树群落(H1)、羊草单优势种群落(H2)生境内的羊草无性系种群年龄结构进行对比分析。结果表明:(1)H1、H2样地内羊草无性系种群分蘖株数量分别由3个龄级和4个龄级组成,且随着龄级的增大迅速减少;各生境羊草种群年龄结构同为增长型。(2)两个样地羊草无性系种群根茎长度均由4个龄级组成,其中H1样地羊草无性系种群根茎长度年龄结构为增长型,H2样地为稳定型。(3)两个样地羊草无性系种群分蘖株生物量与分蘖株数量龄级构成相同,年龄结构均为增长型;根茎生物量均由4个龄级组成都为稳定型。各生境分蘖株和根茎生物量年龄结构均以低龄级居于优势位置。
The age structure of Populus tomentosa populations in Populus tomentosa community (H1) and Leymus chinensis (Habitat) (H2) habitat in Zhaosu County of Ili Valley were compared. The results showed that: (1) The number of tillers of Leymus chinensis clonal populations in H1 and H2 plots were composed of three age classes and four age classes, respectively, and decreased rapidly with age. The age structure of Leymus chinensis population The same growth. (2) The root length of two populations of Leymus chinensis clonal populations consisted of 4 age classes. Among them, rhizome length and age structure of the Leymus chinensis clonal populations in H1 were increased and H2 was stable. (3) The biomass of tillering plants of two populations of Leymus chinensis had the same age-class structure as that of the tillers, and both of them were growth-type. The biomass of rhizomes was composed of 4-age classes. The biomass and age structure of tillers and rhizomes in all habitats all dominated the younger age groups.