三江平原典型草甸小叶章种群高生长及其与生物量的关系

Height Growth of Deyeuxia angustifolia and Its Relationship with Biomass of Population in Typical Meadows in Sanjiang Plain

小叶章为三江平原典型草甸的建群植物，为了探讨其高度与其地上生物量之间的关系，采用野外调查与测定的方法进行研究，结果表明：小叶章种群的高度（Ｈ）、地上生物量（Ｂｐ）、茎生物量（ＢＳ）、叶生物量（Ｂ１）的极大值均出现在７月末，分别为１１２．６７ｃｍ、９９６．９５ｇ／ｍ２、５７１．４８ｇ／ｍ２、４１１．５６ｇ／ｍ２。此前，高度符合Ｌｏｇｉｓｔｉｃ增长（ｒ＞ｒ０．０５），其它均符合指数增长（ｒ＞ｒ０．０１）。而且，它们之间存在良好的线性关系（ｒＨ－Ｂｐ、ｒＨ－ＢＳ＞ｒ０．０１，ｒＨ－Ｂ１＞ｒ０．０５）。高度增长速率在６月末～７月中旬达到极大值１．７７０７ｃｍ／ｄ，此前均大于１．００ｃｍ／ｄ，而后迅速降低。株高分布频率则具有低→高→低的季节变化，且集中分布频率表现出由集中的分数状态发展的趋势。

Deyeuxia angustifolia is a constructive species in typical meadow in Sanjiang Plain. This paper states the relations between the height growth and aboveground biomass. All the maximum values of height (H), aboveground biomass(B p ), stem biomass (B s) and leaf biomass (B 1) occurred at the end of Mary, being as 112.67 cm, 996.95 g/m 2, 571.48 g/m 2 and 411.58 g/m 2 respectively. Before the occurrence of the maximum values, height growth obeys Logistic relation (r >r 0.05), and the others obey exponent relation (r> r 0.01). There is good relationship among themr H-B p 、r H-B S >r 0.01 ,r H-B 1 > r 0.05) The growth rate of height (V H) reaches its maximum value 1.7707 cm/d at the end of June to middle of Mary. Before this period, the growth rate of height is more than 1.00 cm/d and after this period it rapidly falls down. The dynamic change of frequency distribution of plant height is of low-high-low trend, and the focus distribution frequency is of the trend of concentration to dispersion, which reflects the spatial distribution characteristics of height.