条带式改良陡坡草地的水土保持效益

BENEFIT OF SOIL AND WATER CONSERVATION TO BANED IMPROVEDPASTURE OF STEEPLAND

本文对条带式补播改良天然划坡的水土保持效益进行了研究。其结果表明,用条带式改良陡坡草地。其风干划产量较天然草地提高1.76～2.25倍,草群中豆科牧划的比重由原业的24.04％增加到75.46％,有毒有害植物明显减少,植被覆盖度由42.5％增加到83.5％,且改变了植物群落结构。改良草地的地表径流比天然草地减少13.14％,土壤冲刷减少28.08％,为有效地控制地表土壤水分和养分的流失创造了条件,提高了水土保持效益,并为黄土高原丘陵沟壑区陡坡划地的改良提供了依据。

This paper studied the benefit of soil and water conservation to banded improved—pasture of steepland. The result showed that air—dry herbage yield of banded improved—pasture was from 2. 76 to 3. 25 times aslong as natural rangeland. The proportion of the leguminous grass has been increased 51. 42% in the grass associations, poisonous plants has been reduced, density of cover has been increased 41%, the surface run off of the improved pasture was reduced 13. 24% and soil erosion was reduced 28. 08% compared with natural rangeland. This method could provide basis for improving steepland pasture at the hills ans ravine of the loess plateau.