人工草地的羊草生长繁殖动态

研究了松嫩人工草地，羊草地上营养株与生殖株和地下根茎的生物量及其它各组分的季节动态变化，探讨了它们之间的关系，根据生物量随时间的变化，求出了其生长率及生物量与茎，叶，鞘及穗之间的比例。结果表明，生长季中营养株与生殖株生长有2个峰值。峰值其一在6月10－20日之间，AGR为0.0710与0.0925;其二在8月10－20日之间，AGR为0．1050与0．2071，羊草营养株与生殖株的生长妆期，叶所占的比例产大，分别为92．5％和93．9％，7月中旬叶所占的比例变小，而茎与鞘所占的比例变大。此外，对羊草生物量及其它各组分进行一元非线性回归模拟，建立了多项式，指数，对数及幂函数模拟模型。可为人工草地植物群落建植与管理提供科学依据。

The growth and reproductive trends of Leymus chinensis on sown pastures

The seasonal variation trends and relationship of biomass and other ingredients of the aboveground tillers and underground rhizome of Leymus chinensis on sown pastures of the Songnen Plains in China were studied. The absolute growth rate ( AGR ), biomass, proportion of stem, leaf, sheath and spike were measured. The results showed that there were two peak values of AGR for the growth of vegetative ramets and reproductive ramets. The first two values which were 0.0710, 0.0952 emerged from June 10 to 20. The second two were 0.105 0, 0.207 1 during August 10 to 20. At the beginning of the growth of vegetative and reproductive ramets, the proportion of leaves were higher (92.5% and 93.9%). The proportion of leaves decreased in the middle ten days of July. However the proportions of stem and sheath rose. Furthermore, the polynomial, exponential, logarithm and power function simulation models have been constituted by one unknown non linear regression for biomass and other ingredients. This paper provided a scientific bases for the construction and management of sown pastures.