论文部分内容阅读
报道了在恒温培养下，几种添加剂对外加硒在黄棕壤中不同形态的影响．试验表明，与对照土壤样品比较，经添加ＫＨ２ＰＯ４、Ｋ２ＳＯ４、ＣａＣＯ３、苜蓿和苜蓿＋ＣａＣＯ３，其可溶态Ｋ２ＳＯ４－Ｓｅ和残渣态ｒｅｓｉｄｕｅ－Ｓｅ的百分含量均有不同程度的提高．除添加ＣａＣＯ３外．加入其它添加剂时ＫＮ２ＰＯ－Ｓｅ的百分含量有大幅度的降低，其中以添加ＫＨ２ＰＯ４的最为明显．土壤添加Ｋ２ＳＯ４后氧水提取态ＮＨ３·Ｈ２Ｏ－Ｓｅ变化很小，而其余处理中的下降较多．所有试验中，随着培养时间的增加，交换态ＫＨ２ＰＯ４－Ｓｅ呈缓慢下降趋势，残渣态ｒｅｓｉｄｕｅ—Ｓｅ呈缓慢上升趋势，两者之间相互消长．在整个培养期间．经ＣａＣＯ３处理后的土壤，交换态ＫＨ２ＰＯ４－Ｓｅ和氨水提取态ＮＨ３·Ｈ２Ｏ－Ｓｅ的百分含量相近，而在其余的处理中交换态ＫＨ２ＰＯ４－Ｓｅ小于氨水提取态ＮＨ３·Ｈ２Ｏ－Ｓｅ的百分含量．
The effects of several additives on the different forms of selenium in yellow-brown soil under constant temperature culture were reported. The results showed that the percentages of soluble K2SO4-Se and residue-Se in residue increased with the addition of KH2PO4, K2SO4, CaCO3, alfalfa and alfalfa + CaCO3 compared with the control soil samples. In addition to adding CaCO3. The percentage of KN2PO-Se decreased significantly with addition of other additives, most notably with KH2PO4. After adding K2SO4 to soil, the change of NH3 · H2O-Se in oxygenated water changed little, but the decrease in other treatments was more. In all experiments, the exchangeable KH2PO4-Se showed a slowly decreasing trend with the increase of incubation time, while the residue-Se showed a slowly increasing trend with the increase of incubation time. Throughout the incubation period. The content of exchangeable KH2PO4-Se and NH3 · H2O-Se in ammonia-treated water was similar to that in the treated soil after CaCO3 treatment, while the exchangeable KH2PO4-Se was smaller than the percentage of NH3 · H2O-Se content.