利用肉牛重牧践踏结合补播牧草改良退化草地的研究

Research on Combining Heavy Grazing of Beef Cattle with Supplementary Pasture Seeds on Degenerated Grassland

受"绵羊宿营法"的启发,在山地红壤人工退化草地上,以电围栏为辅助,利用肉牛重牧践踏破坏原有植被,结合补播牧草对退化草地开展了改良试验。试验在7月份进行,供试牛群为BMY杂交牛,依据践踏时间的不同设7个践踏强度水平,3次重复,试验小区随机区组排列。结果表明:践踏强度与践踏后补播牧草的盖度、组分、产量间均存在显著的回归关系(F>F0.05)。在践踏强度为2.77 t.h/m2时,牧草产量最高,两年的干物质平均产量为4 063 kg/hm2,显著高于其他处理的牧草产量(P<0.05)。试验结果表明利用重牧践踏结合牧草补播能取得较好的改良效果,对于开展肉牛养殖的牧场,在小面积草地改良方面值得参考和借鉴。

Accepting the enlightenment of sheep night penning, relying on electric fence, making use of heavy grazing on trampling the original vegetation, combining pasture supplement seeding, several improving experiments were done on artificial degeneration pasture of mountain red earth areas in July. The crossbreeding beef cattle of BMY were the examination herds. Three experimenting repeats were done according to 7 trampling intensity on the different trampling periods. The trial plots were block designed randomly. The trials showed that notable regression relation （F 〉 Fo.os） existed between trampling in- tensity and supplementing pasture coverage, blocks and pasture output. When the trampling intensity was 2. 77 t · h/m2, the pasture output is maximal. The two years＇ average yield of dry matter was 4 063 kg/hm2, significantly higher than other treatments （P 〈 0. 05）. It is indicated that the methods of com- bining with heavy grazing trampling and supplement seedinz can achieve the better improved results on artificial degeneration pasture of mountain red earth areas. The experience of the trial is worth using for reference in the small scale pasture improvement for the beef cattle raising farms.