几种冰草属披碱草属牧草种群地上生物量形成规律的研究

本文从种群生态的层次,研究了在宁夏盐池干草原向荒漠草原过渡地带冰草属、披碱草属6种牧草种群地上生物量的形成规律。结果表明,供试牧草种群高度生长有明显季节性。与其它5种牧草相比,俄罗斯野麦草生长发育早而快,其种群地上生物量及有效营养物量生长季内的变化曲线均呈单峰式,在乳熟期最大值分别为141.3和86.0g/m²。此外,本文还指出了牧草的最佳利用时期,并在牧草生产上提出一些建议。

Formative regularity of aboveground biomass of Agropyron and Elymus species.

The formative regularity of aboveground biomass of six species of Agropyron and Elymus in transition region from dry to desesrt steppe at Yanchi county of Ningxia is studied from the view point of population. Results show that the height growth of tested herbages is varied with seasonal changes. The growth and development of Elymus junceus are earlier and faster than those of other 5 species. The aboveground biomass and available nutrients of E. junceus change with time and reach to the peak in growing season, their maximal values in milky stage being141.3 and 86.0g·m^-2 respectively. The optimal utilization period of forage grasses is pointed out and suggestions on grass prodution are put forward.