不同放牧强度对南方人工草地植被特征的影响

研究了山羊不同放牧强度对南方人工栽培草地植被特征的影响。结果表明:放牧利用下鸭茅高度和对照差异显著(P<0.05),黑麦草和白三叶高度在对照区和放牧区差异不显著(P>0.05);放牧强度对不同植物的盖度影响不同,放牧利用降低了鸭茅和黑麦草盖度,对白三叶盖度影响不大,从整个植物群落来看,对照区盖度大于放牧小区;放牧地0～20 cm土层地下生物量占90%左右,随着放牧强度增加,地下生物量有减少趋势;放牧利用后牧草粗蛋白(CP)和粗脂肪(EE)含量都有所下降,而酸性洗涤纤维(ADF)和中性洗涤纤维(NDF)则有所增加。

Effects of Different Stocking Rates on Vegetation Traits of Cultivated Pastures in Southern China

Effects of different stocking rates on vegetation traits of cultivated pastures in southern China were studied.The results showed: the height of Dactylis glomerata L.had significant differences between the control and grazing areas,and the heights of Lolium perenne L.and Trifolium repens had no significant differences between the control and grazing areas.There were different effects of cover under different stocking rate,the cover of Dactylis glomerata L.and Lolium perenne L.were decreased under grazing,and there were little effects on Trifolium repens,total covers of the control was greater than that of grazing areas;there was about 90% underground biomass in 0-20cm soil layer of pasture,the biomass decreased with increasing grazing pressure index.The contents of crude protein and crude fat decreased under grazing,and the contents of acid detergent fibre and neutral detergent fiber increased under grazing.