刈割处理对贝加尔针茅草原植物生长与繁殖状况的影响--Ⅳ.对生殖状况的影响

在2年内进行刈割和对照处理的基础上，于观察草原植物营养生长与处理间关系的同时，定量和定性观察了植物的生殖状况对处理的反应。结果表明，在处理年内，通过生殖枝数量、高度、出现率、开花数、结实情况等表现出来的生殖活动状态基本上随刈割强度加大和刈割时间的推后而变差。1年1次处理效果即很明显，连续2年2次处理，累加效应更加显著。中晚期连续强度利用，使植物种子繁殖受到十分不利的影响，成为草原退化的重要原因。

EFFECTS OF CUTTING TREATMENTS ON PLANT GROWTH AND REPRODUCTIVE STATUS IN Stipa baicalensis STEPPE Ⅳ. EFFECTS ON THE PLANT REPRODUCTION

Based on the observation of relationship occurring between vegetative growth of plants and cutting treatments during two years, the responses of plant reproductive activities to treating intensity and treating time were quantitatively observed. The results showed that in the treating year plant reproductive status reflected from number, height and appearing rate of reproductive plants or branches, flowering numbers and seeding conditions became worse with the increase of treating intensity and delayed cuttings. The effects were significant when treated only once a year, and the accumulated effects resulted from two times of treatments in two years were more significant. The steppe degradation could be caused by continuous heavy treatments in summer and autumn because of the negative effects on plant reproduction.