猪粪施用对黑土型水稻土磷转化过程的影响

Effects of pig manure on phosphorus conversion in black paddy soil

以辽河三角洲水稻土为研究对象,采用培养试验模拟稻田淹水-落干变化,探究了猪粪施用对黑土型水稻土中磷素赋存形态和微生物生物量的影响。结果表明:与不施磷肥相比,添加猪粪处理下的土壤速效磷(Olsen-P)和全磷(total phosphorus, TP)含量在淹水40 d后分别显著增加276.3%和34.1%(P<0.05),无机磷中Ca2-P,Ca8-P,Al-P,Fe-P含量分别显著增加384.7%,142.9%,105.8%和44.1%(P<0.05);中等稳态有机磷(fulvic acid-associated organic phosphorus, FAPo)显著增加36.6%(P<0.05);进一步落干20 d后,土壤Olsen-P和TP含量分别显著增加213.1%和21.6%(P<0.05),Ca2-P,Ca8-P,Al-P,Fe-P含量分别显著增加343.1%,113.7%,89.8%和35.8%(P<0.05);猪粪施用显著增加微生物量磷(microbial biomass phosphorus, MBP)含量,微生物量碳(microbial biomass carbon, MBC)有所增加,但MBC/MBP略有降低。添加猪粪处理可显著增加各培养时期土壤Olsen-P,TP和活性较高的无机磷组分以及淹水培养时的稳态有机磷(humic acid-associated organic P,HAPo)含量,提升了黑土磷库库容和磷素有效性。

In this study, the incubation experiment was conducted to explore the effect of pig manure application on phosphorus forms change in black paddy soil. The results show that compared with no application of phosphorus fertilizer, the content of soil available phosphorus(Olsen-P) and total phosphorus(TP) are significantly increased by 276.3% and 34.1%(P<0.05), respectively, after 40 d of flooding with the addition of pig manure, the contents of Ca2-P, Ca8-P, Al-P, Fe-P in inorganic phosphorus increase significantly by 384.7%, 142.9%, 105.8%, 44.1%(P<0.05), respectively, fulvic acid-associated organic phosphorus(FAPo) significantly increase by 36.6%(P<0.05);after futher drying for 20 d, soil Olsen-P and TP contents significantly increase by 213.1%, 21.6%(P<0.05), Ca2-P, Ca8-P, Al-P, Fe-P content significantly increase by 343.1%, 113.7%, 89.8%, 35.8%(P<0.05), respectively;Pig manure application significantly increase microbial biomass phosphorus(MBP) content, and microbial biomass carbon(MBC) increases, but MBC/MBP slightly lower. The addition of pig manure significantly increased the soil Olsen-P, TP, inorganic phosphorus components with high activity at each incubation period and humic acid-associated organic P(HAPo) content during waterlogged incubation, and improved the storage capacity and phosphorus availability of black soil.