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绵羊宿营法(A_2B_1C_8处理)改良后的草地,在不施维持肥的情况下,其第三年牧草干物质产量达11415kg/(hm~2·年),而作为对照区的用常规法建植的人工草地,在施用维持肥的条件下,其第三年牧草干物质产量仅为8628kg/(hm~2·年),P<0.01。前者草地植物组分中豆科牧草所占比例达7%～20%左右,优良牧草所占比例约达100%,后者分别达到7%～20%和88%～98%左右。研究结果表明,绵羊宿营法改良后的草地,在控制水土流失方面,其效果相当于或好于高产人工草地和保护完好的天然草地。在日降雨量为5～10mm和30～40mm水平下,坡度为15°±1°时,其地面迳流量损失仅相当于农田的45%左右,土壤冲刷损失量仅相当于农田的1%左右。经济分析表明,当地条件下,绵羊宿营法改良草地的建植成本相当于常规法的31%,由于前三年可全部免去常规法所需投入的草地维持费用,所以其总成本(包括放牧地化肥补偿费)相当于常规法的20%。
The improved grassland of sheep was treated with sheep in the camp (A_2B_1C_8 treatment). The dry matter yield of forage grass reached 11415kg / (hm ~ 2 · yr) in the third year without applying fertilizer, while the control Of artificial grassland, the dry matter yield of forage grass in the third year was only 8628kg / (hm ~ 2 · year), P <0.01 under the condition of maintaining fertility. The proportion of legumes in the former grass plant fraction is about 7% to 20%, and that of fine forage is about 100%, the latter reaching about 7% to 20% and 88% to 98% respectively. The results show that the improved grassland of sheep camping method is equivalent to or better than high yield artificial grassland and natural grassland protection in controlling soil erosion. At the daily rainfall of 5 ~ 10mm and 30 ~ 40mm, when the slope is 15 ° ± 1 °, the flow loss of ground 迳 is only about 45% of the farmland, and the erosion loss of soil is only about 1% of the farmland . Economic analysis shows that under the local conditions, the cost of establishing sheep farms for improved grasslands is equal to 31% of the conventional ones. Since the total cost of grazing (including grazing Fertilizer compensation fee) is equivalent to 20% of the conventional method.