条带式改良陡坡草地的研究

STUDY ON BANDED IMPROVED-PASTURE OF HIGHSLOPE

对条带式补播改良陡坡草地效果研究的结果表明，条带式改良草地可以提高产草量，较天然草地的风干草产量提高１７６．３０％～２２５．６０％（Ｐ＜０．０１），且可以改善草群品质，草群中豆科牧草的比重由原来的２４．０１％增加到７５．１６％，有毒有害植物明显减少。草地植被覆盖度由原来的１２．５％提高到８３．５％。改变了植物群落结构，将蒿属植物为建群种的群落变为沙打旺—野艾蒿—万年蓬组成的群落。改良草地地表径流比天然草地减少１３．１４％，土壤冲刷减少２８．０８％，有效地控制了地表土壤养分和水分的流失。

ThiS paper studied the benefit of banded improved-pasture of steepland.The results showedthat air-dry herbage yield of banded improved-pasture was increased 176.30%～225. 60%(P<0. 01)comparedwith natural rangeland. The proportion of the leguminous grass has been increased by 51.42%, poisonousplants have been reduced , the cover degree has been increased 41.0%and plant community was changedinto Astragalus adsurgens-Artemisia lavandulaefolia-Atremisia vesita association.The surface runoff of theimproved pasture reduced by 13.14%and soil erosin reduced by 28.08%. This method could providescientific basis for steepland pasture improving on the hills and ravine of the Loess Plateau.