【摘要】 <正> 甘肃南部的甘南藏族自治州,位于青藏高原的东北部边缘,全区海拔高度约在3,000至4,000余米之间;年降雨量约600至800毫米,雨季集中在5—7月份,年平均气温1—3℃,几乎不存在绝对无霜期。因此,该地区的气候特点是高寒与湿润。在这样的气候条件下,本区大面积发育着以垂穗披碱草(Clinelymus nutans)、垂穗鹅观草(Roegneria nutans)、几种嵩草(Kobresia spp)、几种苔草(Carex spp)为优势种的草原化草甸、真草甸和沼泽草甸植被。更多还原

【Abstract】 The authors have made observation and study on the Fire Succession of three subtypes of meadow vegetation which distributes in the mountain ranges of Southern Gansu, with the purpose to evaluate the influence of fire to the productivity of this type of vegetation. The results are as follows;1. After burning, the production of forage grass in green -weight increases by 14.35% on an average and the increasing rate of true meadow subtype reaches the value of 18.77%;2. In Spring, the forage grasses of these meadows turn green 15 to 18 days earlier in comparison with those without burning and period in utilization of these types of natural pasture is prolonged;3. This measure is in favours of suppressing or destroying insect pests and diseases of livestocks and pastures.Although, accompanying the above mentioned advantages, there are shortcomings of a small degree of decline in quality of forages and their palatability, nevertheless, taking both sides into account, the advantage is apparently bigger than shortcoming. Therefore, the authors consider that burning is one of the useful measure in raising productivity of these pastures.更多还原