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应用15N示踪方法 ,研究了稻田农牧沼生态系统中N的储存、转化、流向及其利用效率。证明猪对紫云英青贮饲料中粗蛋白质的消化率为 53.76 % ,猪粪和猪尿对青贮饲料中N的回收率分别为 39.36 %和 2 4 .71% ,猪粪尿沼气发酵 ,N的回收率达 97.9% ,水解N含量为发酵前的2 .6倍。绿肥和沼肥与化肥配合施用能促进N向稻谷转移 ,从而有利于产量的提高 ,且肥料N在土壤中的残留量相当于单施化肥的 2～ 2 .5倍 ,而气态损失N ,后者为前者的 2 .6～ 8.2倍。整个系统的综合经济效益比单纯的肥稻稻增加 3～ 4倍 ,生态效益和社会效益显著
Using 15N tracer method, the storage, transformation, flow direction and utilization efficiency of N in paddy field agro-pasture ecosystem were studied. The results showed that the digestibility of crude protein in astragalus silage was 53.76%, that of pig manure and pig urine was 39.36% and 24.71% respectively, pig manure and biogas fermentation, N The recovery rate reached 97.9%, hydrolysis N content was 2.6 times before fermentation. Combined application of green manure and biogas manure and chemical fertilizers can promote the N-translocation to paddy so as to increase the yield, and the residual amount of fertilizer N in the soil is equivalent to 2 to 2.5 times as much as applying chemical fertilizers, while the loss of gaseous nitrogen The former is 2.6 ~ 8.2 times. The comprehensive economic efficiency of the whole system is increased by 3 ~ 4 times than that of pure rice and the ecological and social benefits are significant