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在湖南南山牧场研究了在不同放牧制度和强度下奶牛对多年生黑麦草／白三叶人工草地地下和地上生物量及其组成的影响。结果表明，地上生物量及各土层中地下生物量均以轮牧制较高；随放牧强度增加，根系生物量呈下降趋势，而地上总生物量呈增加趋势。
The effects of dairy cow on subsurface and aboveground biomass and its composition in perennial ryegrass / white clover artificial grassland under different grazing systems and intensities were studied in Nanshan Ranch, Hunan Province. The results showed that aboveground biomass and underground biomass in each soil layer were higher in grazing rotation. With the increase of grazing intensity, root biomass decreased and total biomass increased.