放牧强度对羊草草地植被再生性能的影响

Effect of grazing intensity on the regrowth capability in Leymus chinensis grassland

通过小区控制放牧试验,研究了放牧强度对松嫩平原羊草草地再生性能的影响。结果表明,再生期间和放牧强度对羊草草地的再生草量和再生速率的影响均达到了显著水平(P<0.05);地上生物量、再生草量和再生速率存在着明显的季节性,都呈"单峰型"变化,其峰值出现在7-8月,相对再生速率随季节变化呈直线下降趋势。在适度放牧强度(P4)下,再生草量和再生速率都最大,这说明一定程度的放牧能够促进牧草再生;根据牧草相对再生速率随放牧强度增大的变化曲线,可以确定本试验条件下适于牧草生长的最适放牧强度为8～12只/100m2。

The effect of grazing intensity on the regrowth capability in Leymus chinensis grassland was studied by grazing experiment. The results showed that the effect of regrowth duration and grazing intensity on regrowth biomass and regrowth speed was significant. There were seasonal dynamics as 'one peak' for aboveground biomass, regrowth biomass and regrowth speed, whose peak appeared in July-August. Relative regrowth speed decreased with change of seasons. Regrowth biomass and regrowth speed reached the climax under proper grazing intensity (P_4 plot), which indicated that proper grazing intensity could promote the regrowth of herbage. Based on the analysis on the relationship between relative regrowth speed and grazing intensity, there was an optimum domain of grazing intensity, which was 8-12 goats/100 m^2.