多年生黑麦草/白三叶人工草地饲用价值及其与环境的关系

Relationship Between Nutritive Value Changes and Environmental Factors in Mixed Sward of Perennial Ryegrass/White Clover

笔者于 1994年 5～ 11月在湖南南山牧场研究黑麦草 /白三叶人工草地的饲用价值及其与环境的关系。当年12月～翌年 12月对植物及土壤进行分析 ,结合放牧强度进行统计。结果表明 ,在不同放牧强度条件下 ,多年生黑麦草 /白三叶人工草地的饲用价值各异 ,其中以适度放牧区较高。引起人工草地退化的首要因素是 0～ 10 cm土壤速效磷含量 ,但放牧引起的土壤紧实及其相互作用则是退化的重要因素。分析人工草地的饲用价值及其退化原因 ,笔者认为 ,适度放牧不但保持草地的较高利用价值 。

Field works on relationship between nutritive value changes and environmental factors in mixed sward of perennial ryegrass/white clover Lolium perenne/Trifolium repens were carried out at Nanshan Ranch,Hunan province(25°48′～25°58′N,110°36′～110°40′E) during May to November,1994.Samples of plant and samples soil were analysed during Dec,1994 to Dec,1995.It showed by statistical analysis that grazing lead to degeneration in mixed sward of perennial ryegrass/white colver. The results showed that under the condition of different grazing,nutritive value was different in artificial sward.However,the nutritive value of artificial sward was the highest in the condition of moderate grazing. The available phosphorus contents in 0～10 cm soil layer was of the first important factor causing deteriotation.It was also important factor causing deterioration that grazing lead to soil erosion,surface crusting and interrelation action.