百喜草在退耕坡地种植中的水土保持效应及养羊效果

为弄清百喜草在退耕坡地种植中的综合效应,采用针刺样点法测定植被覆盖度,小区径流池观测地表径流和土壤侵蚀量等方法,研究了百喜草在退耕坡地种植中的水土保持效应及其养羊效果。结果表明:种植当年,百喜草草丛高度、鲜草产量和植被覆盖度分别达15.63cm、2 567.45kg/667m2和95.62%;种植第3年,鲜草产量和植被覆盖度均较当年有所提高,分别为2 896.24kg/667m2和99.23%;而多年生黑麦草及其混播组合与百喜草相比,各项指标均有不同程度下降;与撂荒坡耕地相比,地表径流和土壤侵蚀量分别降低47.54%和93.25%;百喜草饲养山羊,平均日增重133.5g,其屠宰率和净肉率也较高,每只羊净收入达40.36元。退耕坡地种植百喜草不仅可减少水土流失,而且可长期收获饲草,有利于发展生态草地畜牧业。

Effects of Paspalum notatumn in Soil and Water Conservation and Goat Fattening on Degraded Slope-land

The effects of P.notatumn in soil and water conservation and goat fattening on degraded slope-land were studied through needle punching method and plot run-off pool.The results showed that the height,fresh grass yield and vegetation coverage of P.notatumn were 15.63 cm,2 567.45 kg/667m2 and 95.62% respectively in the year when it was planted.The fresh grass yield and vegetation coverage would be up to 2 896.24 kg/667m2 and 99.23% respectively three years later.Nevertheless,compared with P.notatumn,various indexes of perennial ryegrass and its mixed sowing groups decreased in different degrees.Compared with abandoned sloping farmland,the surface runoff and soil erosion amount decreased by 47.54% and 93.25% separately.The daily gain of goats fed with P.notatumn was 133.5 g,and their dressing percentage and pure meat percentage were all very high.The net income of one goat was 40.35 Yuan.By planting P.notatumn on degraded slope-land,not only the loss of soil and water could be reduced,but also the forage grass could be get for ages,which was beneficial to the development of ecological pastoral animal husbandry.