• ISSN 1008-505X
  • CN 11-3996/S

稻田农牧沼生态系统中氮的转化与循环研究

Study on the cycle and transformation of nitrogen in farming-stockbreeding-biogas ecosystem of rice areas

  • 摘要: 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 24 .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

     

    Abstract: 15N-labeled technique was used to study the fixation, transformation, fate and utilized efficiency of N in the farming -stockbreeding-biogas ecosystem of rice areas. The results showed that the crude protein digestibility of the ensilaged milk vetch by pig was 53.76%, the recovery rates of ensilaged milk vetch N by the pig feces and urine were 39.36% and 24.71%, respectively. The recovery rate of N of pig feces and urine was 97.9% for biogas fermentation. The content of hydrolyzable N in biogas fertilizer was 2.6 times higher than before the fermentation. The combined application of milk vetch, biogas fertilizer and chemical fertilizer can promote N translocation to rice grain to increase the yield. The residual N of fertilizer in soil and gaseous loss N in combined application of milk vetch, biogas fertilizer and chemical fertilizer was 1.0~1.5 times higher and 1.6~7.2 lower than that in the treatment of chemical fertilizer alone, respectively. The comprehensive economic benefit in the farming-stockbreeding-biogas ecosystem increased by 300%~400%, compared to that of milk vetch-early rice-late rice system, and ecological and social benefit were also significant.

     

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