龙须草对湖南紫色土荒山坡地蓄水性能的影响

Effects of Eulaliopsis binata on water retaining of purple soil in Hunan

为提高紫色土蓄水能力,防止水土流失,在湖南省衡阳县选择20o左右的紫色土荒山坡地,设置祼地、自然草地、龙须草地和龙须草与林地复合4个处理,比较分析各处理贮水性能及其改良机理.结果表明,与裸地相比,在紫色土荒山坡地上实行龙须草与林木立体种植1～2年后,土壤容重降低0.09～0.10g/cm3,土壤总孔隙度增加14.01%,土壤水分渗透速率提高2.20～2.29倍.

Improving the water retaining of purple soil is a very important measure to prevent its loss of natural environment. By comparison, the function of water retaining of purple soil was studied through 4 treatments： bare land, natural grass land, grass land of Eulaliopsis binata and multiple planting of Eulaliopsis binata with trees. It was found that soil bulk density decreased 0.09-0.10 g/cm^3, total soil porosity increased by 14.01% and soil water penetration speed increased 2.20-2.29 times of multiple planting of Eulaliopsis binata with trees. The water storage capacity and water retaining efficiency of purple soil were remarkably improved.