【摘要】 本文研究了黄土丘陵区紫花苜蓿与沙打旺在施入大量和微量营养元素后的生物量效应，以及植株中的化学元素的浓度和摄入量。结果表明：凡含有Ｐ素的试验处理，两种牧草地上部生物量均有显著增加，对紫花苜蓿根系增加的作用尤其突出。沙打旺施Ｍｏ地上部与根系生物量明显增加；各处理紫花苜蓿地上部Ｋ、Ｆｅ、Ｍｏ的浓度均高于沙打旺，而Ｃａ、Ｍｇ、Ｍｎ、Ｂ的浓度几乎都低于沙打旺。含Ｐ处理紫花苜蓿的Ｐ浓度高于无Ｐ处理，同时伴随Ｚｎ浓度的降低。两种牧草由于施Ｐ虽然导致Ｚｎ浓度的降低，但Ｚｎ的摄入量却高于无Ｐ处理；施Ｍｏ处理地上部Ｎ、Ｐ、Ｋ、Ｃｕ、Ｆｅ、Ｂ、Ｍｏ的浓度．紫花苜蓿大于沙打旺，而摄入量则有相反趋势。更多还原

【Abstract】 The present paper deals with a pot experimenton on the effect of Medicago sativa and Astragalus adsurgens in response to nutrient elements applied.The main results show that:there is a remarable response to P,NP,NPK applieed,and the root -biomass of Medicago sativa is more than all.The application of Mo promote the increment both above-ground and biomass,The concentrations of K,Fe,Mo,for above-ground of Medicago sativa are more than Astragalus adsurgens,but that of Ca,Mg, Mo, B are almost apposite trend,on the treatments of P applied,P comcentration of Medicago sativa more than treatments of P-dificent.In the mean while,Zn-concentration is decrease,but Zn absorbing capacity is increase.The concentrations of N、P、K 、Cu 、Zn 、Fe、B、Mo of above-ground part for sativa are more than that of Astragalus adsurgens,but the absorbing capacity of elements express the apposite tread.更多还原