苇状羊茅和鸭茅的水土保持效果

为了解苇状羊茅和鸭茅两种地方牧草的水土保持性能,2003~2005年对退耕坡地种植的苇状羊茅和鸭茅进行了植被盖度、产草量、根系生物量、径流量、土壤侵蚀量和理化性状的测定比较。结果表明,两种草地盖度分别在播种90 d和120 d后均达到100%,鲜草产量高,径流量分别比对照减少32.7%和38.0%,土壤侵蚀量分别比对照降低80.00%和88.57%,根系数量多,集中分布于0~25 cm土层中,具有良好的水土保持特性,比较适宜在退耕坡地还草中利用。

Effects of Festuca arundinacea and Cocksfoot on Soil and Water Conservation

The vegetation coverage,green grass production,root biomass,runoff volume,soil erosion amount and physical character of Festuca arundinacea and cocksfoot planted on sloping land were measured to investigate their capacities of soil and water conservation during 2003~2005.The results show that the coverage degrees of Festuca arundinacea and cocksfoot reach 100% in 90 days and 120 days after planting respectively,the fresh grass yield is very high,the runoff volume decreases(32.7%) and 38.0% compared with CK respectively,the soil erosion amount decreased 80.00% and 88.57% compared with CK respectively and a vast amount of root system with a good character of soil and water conservation mainly distributed in soil of(0~)25 cm layer,which indicates that Festuca arundinacea and cocksfoot can be planted on the sloping land.