Seasonal changes of soluble sugar contents of Dactylis glomerata in mowing pasture under different intensities of simulating grazing

The different simulatant grazing intensity were designed on Zhaosu Horse Farm to study the change of soluble sugar contents in roots and leaves of Dactylis glomerata in mowing pasture. The results showed that the soluble sugar content in leaf was increasing before the cutting. It was high after returning green but low after heading stage. The roots of soluble sugar contents on growth prophase was not significant (P0.05). It was rapidly decreased after cutting, and then raising up until late September. The coimpacts of season and grazing intensity on the soluble sugar content were significant (P0.01). The effect of the grazing intensity on the soluble sugar content was significant, but its affecting patter was not obvious due to season and climate.