【摘要】 在亚热带山地湿润环境条件下 ,研究牧压和土壤肥力对人工草地净生产的影响。三年试验结果表明 ,绵羊在轮牧下 ,产草量和磷肥对全年及各月牧草净生产具有显著影响。禁牧时 ,夏季地上生物量积累到一定程度后 ,只有很少量的净生产。放牧时 ,产草量在 10 0 0 kg DM/ hm2左右时 ,净生产最大 ,当产草量低于 30 0 kg DM/ hm2以下时 ,净生产量则降低。每年施一次 P2 O5 3 6～ 6 0 kg/ hm2 ,可以显著增加牧草净生产 ,尤以春末夏初时施肥更为显著。最低产草量出现在不施肥处理更多还原

【Abstract】 The effect of grazing and fertility on net pasture production(net herbage accumulation)was studied experimentally in a subtropical mountain area located in Western Hubei Province.The result of three years from 1997 to 1999 showed significant effect of post grazing residual and P level on seasonal and annual net production of the sown pasture under sheep rotational grazing.The pasture without any grazing disturbance had little net production after reaching a high level in summer.Net production was maximized by grazing management with a residual around in net production.Phosphorus applied annually at 36～60 kg/hm 2 resulted in markedly increased pasture net production,particularly during late spring/early summer period when there is a high potential of pasture growth.The lowest production occurred where no fertilizer was applied. [WT5HZ]更多还原