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本文应用~(14)C均匀标记的杂交狼尾草喂饲山羊,制备~(14)C均匀标记的羊粪,测定了~(14)C在山羊体内代谢68小时过程中的分配状况,及~(14)C标记羊粪再循环过程中,羊粪在不同土壤中的矿化特点。山羊同化~(14)C饲草碳量较少(0.45％),羊粪中~(14)C回收率为13.5％,尿为0.88％,在体外进行再循环。培养试验结果表明,~(14)C羊粪碳在石灰性土壤中年矿化量比非石灰性土壤高3％,同时前期矿化较快。土壤不同水湿状况相比较,淹水土壤中~(14)C羊粪年矿化量为旱地土壤中的1.3倍,旱地土壤中的前期矿化较快,淹水土壤中的矿化过程较平稳。~(14)C羊粪碳的年矿化量较~(14)C秸秆碳低,仅为其1/4,且矿化过程较平稳。~(14)C羊粪配合无机氮肥施用,可提高~(14)C羊粪碳的矿化量,其提高幅度在石灰性土壤中为3.53％,非石灰性土壤为1.80％。
In this paper, ~ (14) C homogenized labeled sheep manure was prepared using ~ (14) C homogenously labeled hybrid Pennisetum, and the distribution of ~ (14) C in goats during 68 hours of metabolism was determined. ~ (14) C labeled sheep manure in the process of sheep manure in different soil mineralization characteristics. (14) C forage carbon was less (0.45%) in goat assimilation, 13.5% in ~ (14) C in sheep manure and 0.88% in urine was recovered in vitro. The results of culture experiment showed that ~ (14) C sheep manure carbon had 3% higher annual mineralization in calcareous soil than non-calcareous soil, and the earlier mineralization was faster. The mineralization amount of ~ (14) C sheep manure in flooded soil was 1.3 times that in dryland soil, and the earlier mineralization in dryland soil was faster. The mineralization process in flooded soil was more smooth. ~ (14) C sheep fecal carbon annual mineralization ~ (14) C straw carbon is low, only 1/4, and the mineralization process is relatively stable. ~ (14) C sheep manure combined with inorganic nitrogen could increase the amount of ~ (14) C sheep manure carbon mineralization by 3.53% in calcareous soil and 1.80% in non-calcareous soil.