【摘要】 在内蒙古多伦县干沟乡围栏封育5年的退化草地上,连续2年分别施用控释肥和包膜肥的试验结果表明:与不施肥比较,表施控释肥和包膜肥对退化草地恢复具有明显的效果,在0～20cm土层中以土壤速效磷含量的增加最明显,平均增加227%～504%,水解氮含量增加32%～50%;牧草种类增多,生物量增大,种群结构改善,特别是在表施控释肥的处理中出现了标志退化草地恢复进程的羊草。表施控释肥105kgN/hm2时,经济效益最好,净收益为221元/hm2,牧草的干草产量为2362.5kg/hm2,是不施肥处理的5倍,比表施包膜肥135kgN/hm2增加干草约30%,差异均达到显著水平(P<0.05)。更多还原

【Abstract】 Two years continuous fertilizing experiments in degraded grassland shown that broad casting coated fertilizer and control release fertilizer (105～135 kgN/hm~2)was an effective measurement for rapid restoration of degraded grassland.The content of available phosphor and hydrolysable nitrogen of soil (0～20cm)were significantly increased by 227%～504%,32%～50%,respectively,compared with CK.Especially,when control release fertilizer(105kgN/hm~2)was broad casted,the dry weight of herbage was 2362.5(kg/hm~2,)it was as many as 5 times of CK,the net income was 221yuan/hm~2,the population structure of herbage has been markedly improved.更多还原