中文摘要：

采用混合水平均匀试验U6（62×3）,考察猪粪堆肥过程中分别添加不同摩尔分数（20%、40%、60%）的改性赤泥（pH为5.0±0.2和7.0±0.2）、改性镁橄榄石（pH=7.0±0.2）以及硫酸镁对氮磷营养元素保存的影响.结果表明,以猪粪初始总氮含量的20%添加改性镁橄榄石（第17 d）和40%添加硫酸镁（第10 d）的保氮效果相近,并优于其他试验组.添加金属盐类的试验组的固磷效果均优于对照组,其中按20%添加pH=5的赤泥（第21 d）对TP的保存效果最佳,且其中正磷酸盐所占比例最小.

英文摘要：

Batch experiments were carried out by using mixed-level uniform design method U6（62 × 3） to investigate the effect of the addition of different metal-salts at 20%,40% and 60% of NTN respectively,including modified red-mud（MR） at pH 5.0 ± 0.2 and 7.0 ± 0.2,respectively,modified forsterite（MF） at pH 7.0 ± 0.2,and MgSO4 on nitrogen and phosphorus conservation during swine manure composting.The results showed that the optimum effect of N saved occurred at No.5 experiment（20%,MF,day 17） and No.3 experiment（40%,MgSO4,day 10）.Meanwhile,the P conservation of experiments with metal salts addition was better than that of the control,and the No.6 experiment（20%,MR with pH = 5,day 21） was the highest on TP conservation,with the lowest ratio of PO43--P/TP.