干热河谷不同引进草种水土保持效果比较

对3种引进草种的生物量、枯落物量、土壤的容重、孔隙度、自然含水量、毛管持水量、饱和含水量、机械组成、有机质含量、渗透性能和抗蚀能力等进行了测定和分析。结果表明,3种引进草种的水土保持效果依次为纳罗克非洲狗尾草>威提特东非狼尾草>沙弗雷肯尼亚白三叶草,纳罗克非洲狗尾草的持水能力和土壤改良性能最好,是水土保持效果最佳的牧草,可以推广种植,其次是威提特东非狼尾草。

Effects of Different Introduced Grasses on Soil and Water Conservation in Dry-Hot Valley

A study on soil and water conservation effects of different introduced grasses in dry-hot valley was conducted in Yunnan.It includes analysis of biomass,fresh weight and water holding capacity of leaves and stems,litter weights and water holding capacity,soil bulk density,soil porosity,soil moisture content,capillary moisture capacity,saturation moisture content,soil constitution and organic matter,soil permeability and erosion-resisting characteristics.The results showed that water holding capacity and soil improvement of three introduced grasses is Setaria sphacelata cv.Narok>Pennisetum clandestinum cv.Whitte>Trifolium semipilosum cv.Safari.Setaria sphacelata cv.Narok is the best fodder and has the highest water holding capacity and soil improvement in three grasses.Pennisetum clandestinum cv.Whitte is the second.They can be planted in Yunnan.