【摘要】 为阐明不同施肥条件下土壤有效磷与土壤磷素累积的响应关系,为黄潮土农区科学施用磷肥提供依据。分析了黄潮土34年(1980-2014年)肥料长期定位试验中,不同施肥处理下土壤磷素盈亏与土壤有效磷的变化特征。结果表明:长期不施磷肥处理(CK、N)土壤有效磷含量随年限的延长呈极显著(P<0.01)下降趋势,年均分别降低0.16,0.11 mg/kg;长期施用有机肥及有机无机配施处理(M、MN、MNP、MNPK),土壤有效磷含量呈极显著(P<0.01)上升趋势,年均分别增加1.12,1.00,1.65,1.49 mg/kg;而长期施用化学磷肥处理(NP、NPK),土壤有效磷含量呈持平的趋势。土壤有效磷变化量随磷素盈亏而变化,不施磷肥处理(CK、N),土壤中的磷素均亏缺,土壤每亏缺100 kg/hm2磷,有效磷含量降低分别为0.68,0.47 mg/kg;长期施用有机肥及有机无机配施处理(M、MN、MNP、MNPK),土壤中的磷素均有盈余,土壤中每盈余100 kg/hm2磷所能增加的土壤有效磷含量分别为1.98,2.19,1.56,1.42 mg/kg。更多还原

【Abstract】 Response of Olsen-P to P balance in a yellow fluvo-aquic soil was studied in a long-term fertilization experiment carried out in Xuzhou,Jiangsu province for the purpose of providing a theoretical basis for the scientific application of phosphate fertilizer in the yellow fluvo-aquic soil farming areas. The relationships between Olsen-P change and the budget of soil P balance in the eight treatments were studied by the method of linear regression based on a 34-year( 1980- 2014) experiment. The results showed that long-term application of CK and N resulted in significant decrease of Olsen-P by 0. 16 and 0. 11 mg / kg,and M,MN,MNP,MNPK resulted in significant increase of Olsen-P by 1. 12,1. 00,1. 65,1. 49 mg / kg,respectively. While the soil Olsen-P content remained stable in the NP and NPK treatments. The increase amount of Olsen-P changed with P balance. Application of CK and N reduced the amount of Olsen-P significantly. With an average wane of 100 kg phosphorus per ha,the soil Olsen-P decreased by 0. 68 and 0. 47 mg / kg,in the CK,N treatments,respectively. Application of M,MN,MNP and MNPK increased the amount of Olsen-P significantly. With an average surplus of 100 kg phosphorus per ha,the soil Olsen-P increased by 1. 98,2. 19,1. 56,1. 42 mg / kg,in the M,MN,MNP and MNPK treatments,respectively. Long-term application of organic combined with chemical fertilizer resulted in the increase of the amount of Olsen-P is higher than another treatments.更多还原