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探讨了三江平原以小叶章为优势种的典型草甸、沼泽化草甸、沼泽３个植被类型中小叶章种群高度的变化规律。结果表明，在３个类型中，种群高度的季节动态均呈单蜂型，极大值均出现在７月末，分别为１１２．６７ｃｍ、１０１．６１ｃｍ、８３．８８ｃｍ。ＨＡＧＲ的季节动态在７月末之前＞０，之后＜０；典型草甸和沼泽化草甸的极大值出现在６月末至７月中旬，沼泽则出现在６月中旬至６月末；极小值典型草甸出现在８月末至９月中旬，而另２个类型则出现在７月末至８月中旬。ＨＲＧＲ的季节动态与ＨＡＧＲ相同；极大值沼泽化草甸出现在６月末至７月中旬，而另２个类型则出现在６月中旬至６月末；极小值典型草甸出现在８月末至９月中旬，另２个类型出现在９月中旬至１０月初
The variation regularity of Populus simonii population in typical vegetation, marsh meadow and swamp in the Sanjiang Plain was studied. The results showed that in all three types, the seasonal dynamics of population height showed a single wasp, with the maximum values occurring at the end of July, being 112.67 cm, 101.61 cm and 83.88 cm, respectively. The seasonal trend of HAGR was> 0 before the end of July, and then <0. The maximum of typical meadow and swampy meadow appeared from the end of June to the middle of July, while that of marsh appeared from the middle of June to the end of June. The minimum Typical meadows appear in late August to mid-September, while the other two occur in late July and mid-August. The seasonal dynamics of HRGR is the same as that of HAGR; the maximum swampy meadow appears from the end of June to the middle of July, while the other two types appear from mid June to the end of June; the minimum typical meadow appears from the end of August to the middle of August In mid-September, the other two types appeared in mid-September to early October