松嫩草原放牧地主要植物群落地上生物量的增长规律

The Growing Law of Aboveground Biomass of Main Plant Communities in Grazing Field of the Songnen Grasslands

松嫩平原是我国重要的畜牧业基地和优良草场之一，本文采用收获法对松嫩草原放牧场羊草、小獐茅、马莲、虎尾草、碱蓬、百里香、针蔺、野古草８个群落地上生物量增长规律进行分析。结果表明：群落地上生物量除针蔺群落在７月外，其余７个群落均在８月达到高峰值，季节动态呈单蜂型，均符合逻辑斯蒂曲线。绝对增长速率和相对增长速率的季节动态亦呈单峰型，均在生物量呈高峰值前为正，之后为负，达到极值期依群落类型不同而稍有变化。表明地上生物量的增长和净积累集中于地上生物量的高峰期之前。

The songnen plain is one of the important animal husbandry bases and fine grasslands By havest method, the analysis on the growing law of aboveground biomass of such eight forms as Ancurolepidium chinensis, Aeluropus littoralis var sinensis, Iris lactea, Cloris virgata, Sueda glabra, Thymus serpyllum, Heleochria interbita, Arundineela hirta from grazing field of the Songnen grasslands showed that except Heleochria interbita form in July, in August the other seven forms all reached its peak of above biomass which was accordance with Logistic curve and appeared monopeak on seasonal movement Also the seasonal movements of absolute growing rate (A GR ) and relative growing rate (R GR ) appeared monopeaks were positive before the peaks and negative after the peaks The different time for different forms to reach its peak period indicated that there were little difference in the largest accumulative rate when the growing and net accumulation of ground biomass were concentrated before reaching their peakvalue