黔中黄壤丘陵旱坡地香根草、紫穗槐的水土保持效应

通过4年连续的定点、定位试验研究，结果表明：香根草、紫穗槐生物埂保水能力在第3年后达到或超过次生植被的保水能力；香根草生物埂第2年后保水能力超过紫穗槐生物埂，第3年后无土壤侵蚀发生；紫穗槐 生物埂第2年即无土壤侵蚀发生；香根草、紫穗槐生物埂降低土壤坡度的作用非常明显；种植香根草、紫穗槐生物埂后，玉米产量呈逐年增加的趋势。该技术适宜在黔中乃至全省推广种植。

Effect of Vetivera zizanioides and Amorpha fruticosa on Soil and Water Conservation in Yellow Sloping Upland Areas of Middle Guizhou

The experiments on soil and water conservation of Vetiverazizanioides and Amorpha fruticosa had finished at fixed sites and positions for four years. The results showed that the effect of water conservation by using Vetivera zizanioides and Amorpha fruticosa hedge was equal or superior to the effect of sub-vegetation. No soil erosion occurred by adopting the hedge after the third year. The hedge of Vetivera zizanioides and Amorpha fruticosa had obviously decreased the upland slope and the yield of corn had gradually gone up after planting Vetivera zizanioides and Amorpha fruticosa. This technique is suitable for expanding in Guizhou.