不同放牧制度大针茅草原植物种群有性繁殖能力研究

Study on Sexual Reproduction of Plant Population of Stipa grandis Steppe under Different Grazing System.

放牧制度对锡林郭勒大针茅草原植物种群有性繁殖能力有一定影响,对适口性不同的植物其影响结果不同。大针茅草原适度放牧利用能显著降低植物种群单位面积生殖枝数、种子数及其萌发力。划区轮牧与连续放牧相比,划区轮牧有利于提高适口性好的糙隐子草种群结实生殖枝数、种子雨和种子萌发力;连续放牧有利于提高适口性差的大针茅种群结实生殖枝数、种子雨及其萌发力。

Grazing system influences plant population sexual reproduction to some degree on Stipa grandis steppe and has an various effects on different palatable plants.Suitable grazing on Stipa grandis steppe can apparently decrease reproductive shoot number,seed number per unit,and its viability.Comparing RG(rotational grazing)and CG (continual grazing),RG increases Cleistogenes squarrosa population reproductive shoot number,seed rain and its viability;CG increases Stipa grandis population reproductive shoot number,seed rain and its viability.