亚热带低山丘陵区混播冬性牧草-水稻短期草田轮作系统的研究

Short-term rotation systems of winter forage mixtures with rice in low mountainous and hilly areas of sub-tropical zone of China

1991～1994年在亚热带低山丘陵区(四川芦山县)进行的混播冬性牧草-水稻短期草田轮作系统的研究结果表明,混播冬性禾草和豆草与水稻轮作,即意大利黑麦草+紫云英→水稻、意大利黑麦草+南苜蓿→水稻和意大利黑麦草+白三叶草→水稻3个轮作系统在水稻产量高于对照的情况下获得高饲料价值,较充分地利用了禾草和豆草的共生互补作用,改善了土壤肥力状况,提高了农田生态位的利用效率,从而获得了较高的总生产效率。

The experiments were carried out in Lushan county of Sichuan province during the period of 1991 to 1994.The results showed that the three kinds of rotation systems of mixtures of grasses and legumes with rice-.lMlium multiflorum + Astragalus sinicus-'rice, Loilum multiflo-rum + Medicago hispida- rice and Lolium multiflorum + Trifolium repens- rice, produced higher forage values and higher rice yield than the controlled plots.The utilization efficiency of cropland niche in those three rotation systems was increased through the improvement of soil structure and nutrition condition and the full utilization of symbiosis and mutual supplemental effects of winter grasses and lugumes.Thus the field gross productivity in the rotation systems were increased.