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为了探索退化草场改良的技术途径与措施,我们于1980～1985年在宁南黄土丘陵半干旱区对退化严重的天然草场(植被覆盖度在30%以下)采用补播进行了改良,对较集中的退化天然草场(植被覆盖度在30%以上)采用封育措施进行了改良。结果表明,荒山补播、撩荒地补播、隔带耕翻补播的补播草种以沙打旺、黄花草木樨为先锋草种;撩荒地补播、隔带翻耕补播以红豆草、紫花苜蓿为优良草种;不同品种产草量差异显著。沙打旺密度与产量成负相关,株高与产量成正相关,比对照提高8～13倍;其它三种比对照提高5～8倍。封育试验成本低、效益高,封育2年后产量比对照提高2.4～5.5倍,可轮封轮牧合理利用。
In order to explore the technical approaches and measures for the improvement of degraded pasture, we made some improvements to the reclaimed natural pastures with vegetation degeneration below 30% in the semiarid area of Loess Plateau in southern Ningxia from 1980 to 1985, Of degraded natural pastures (with vegetation coverage above 30%) have been improved by enclosure measures. The results showed that the patchy sowing of barren hills, rewinding sowing of abandoned shrubs and sowing of sowing sowing and rewinding of seagrass sowing and sowing were the first sowing sowing grass, , Alfalfa is a fine grass species; different varieties of grass yield significant difference. Sand density and yield were negatively correlated, plant height and yield were positively correlated, compared with the control increased 8 to 13 times; the other three than the control increased 5 to 8 times. The sealing test has the advantages of low cost and high efficiency, and the output after two years of enclosure is increased by 2.4 to 5.5 times than that of the control, which can be used rationally by wheeled grazing.