黄麻土工布与苎麻结合控制水土流失效应的研究

Effect of Jute Geotextiles in Combination with Ramie on Soil Erosion

覆盖黄麻土工布 ,显著提高了苎麻的出苗速度、出苗率和成活率 ,不仅有利于植被的快速建立 ,同时也有利于其群体的生长。在苎麻植被尚未建立之前 ,黄麻土工布的覆盖使坡面水土流失得到很好的控制 ,此后与苎麻结合具有十分显著的减水减沙作用。1997年和 1998年测定的盖布苎麻分别比对照减少年总径流量 61.95 % ,64.3 5 % ,减少总产沙量均为 96%。黄麻土工布使用 8个月后 ,在 1.0 mm/ min人工降雨条件下测定 ,盖布苎麻比对照推迟产流时间 9m in4 9s,减少累计径流量 95 .5 8% ,减少累计产沙量 99.98%。

The results showed that mulching of jute geotextiles can greatly improve the ger minati on and growth of ramie. Combined with ramie the geotextiles can reduce soil eros ion effectively. When geojute was covered within one year, the treatment of geoj ute with ramie can reduce runoff volume 61.95% and sediment volume 96.52% compar ing with not covered geojute; and when it is covered for two years, the geojute with ramie can reduce runoff volume 64.35% and sediment volume 96. 01% comparing with the contrast. Under 60mm/h medium intensity artificial rainfall, the runo ff occurs 9min49s later when the land was covered with geojute and ramie than the contrast, and its accumulative runoff was 95.58% and accumulative sediment was 99.98% less than that with only ramie.