小叶章种群高度的季节动态

探讨了三江平原以小叶章为优势种的典型草旬、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峰型，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

DYNAMICS OF HEIGHTS OF DEYEUXIA ANGUSTIFOLIA POPULATION

The changing laws of heights of Deyeuxia angustifolia population in three vegetation types, ie. typical meadow, marsh meadow and swamp which are dominated by Deyeuxia angustifolia in sanjang plain are discussed in this paper. The results show that their increasements are all single peak type in the 3 vegetation types, their maximum values all appear at the end of July, respectively are 112.67cm, 101.61cm, & 83.88cm. The seasonal dynamics of HAGR are higher than 0, before the end of July, and then lower than 0, That maximum values of typical meadow and marsh meadow appear at the end of June to the middle of July, and that maximums appear at the middle to the end of June in swamp; the minimum value of typical meadow appears at the end of August to the middle of July, and, that of the other 2 types appear at the end of July to the middle of August. The seasonal dynamics of HRGR are the same as that of HAGR. The maximum value of marsh meadow appears at the end of June to the middle of July, and that of the other 2 types appear at the middle to the end of June. The minimum value of typical meadow appears at the end of August to the middle of September, that of the other 2 types appear at the middle of September to the beginning of October.