Abstract: This article has systematically observed the biomass to three artificial communities (Trifolium pratense, Dactylis glomerata and Trifolium-Dactylis) at Hongchiba.The regression analysis on the biomass dynamics of three communities by Richards’ Equation was established.The regression equation about the aboveground biomass with growing day of Trifolium pratense community is Y = 3383 (1-e^-3.65x)^1.30, r=0.9932, the equation of Dactylis glomerata community is Y = 363 (1-e^-0.09x)^1.83, r=0.9989, and the equation of Trifolium-Dactylis community is Y=1579 (1-e-0.09x)^1.83, r = 0.9892.The dynamics of the underground biomass of Trifolium pratense community changes with one peak at the middle of fruiting peroid and the dynamics of the underground biomass both Dactylis glomerata and Trifolium-Dactylis change with two peaks on the middle ten days of June and on the later ten days of August.The productive rates both communities of Trifolium pratense and Trifolium-Dactylis are higher.It is a quickly stage which dry matter accumulated in budding-flowering peroid and it reaches 10 g/m²•d.

Key words: Pasture community, Biomass, Seasonal dynamics

摘要： 作者对红池坝地区红三叶(Trefolinm pratense)、鸭茅(Dactyles glomerata)和红三叶-鸭茅(Trifolium－Dactylis)生物量进行系统观测。运用理查德方程对三种群落生物量动态进行回归分析,其中红三叶、鸭茅、红三叶-鸭茅三种群落地上生物量回归方程分别为Y=3383(1－e^－3.65x)^1.30,r=0.9932;Y=363(1-e^-0.09x)^1.83,r=0.9989;和Y=1579(1-e^－0.09x)^1.83,r=0.9892。红三叶地下生物量呈单峰变化,鸭茅和红三叶-鸭茅则呈双峰变化。红三叶和红三叶-鸭茅生产速率较,现蕾-开花阶段是其干物质快速积累阶段,生产速率达10g/m²•d以上。

关键词: 草地群落, 生物量, 季节动态