摘要
利用石灰性土壤,对猪粪(DR)、夏玉米秸秆(MR)和冬小麦秸秆(WR)单施或者与磷肥混施(在等磷量条件下)对土壤磷的吸附特性及其形态转化进行了为期15周的室内模拟培养研究.结果表明,无论是DR、MR和WR单施,还是有机物料与磷肥混施,都可以减少土壤对磷的吸附量,增加土壤磷的活性,其中有机物料单施处理的用NaHCO3或者NaOH提取的活性无机磷(Pi)和有机磷(Po)提高较大,顺序为:猪粪>夏玉米秸秆>冬小麦秸秆.夏玉米秸秆处理与对照(CK)相比NaHCO3提取的Pi、Po增加的量分别为6 0mg·kg-1,5 6mg·kg-1,NaOH提取的Po增加的量为12 7mg·kg-1,而猪粪处理与CK相比NaHCO3提取的Pi、Po增加的量分别为7 1mg·kg-1,5 4mg·kg-1,NaOH提取的Po增加的量为14 1mg·kg-1.通过Langmuir方程求得磷的最大吸附量(b)、磷吸附结合能常数(k)、磷素最大缓冲量(MPBC)、标准需磷量(SPR)的值,进一步说明了3种有机物料均可使土壤对磷的吸附能力降低,增加土壤中磷的活性.
The effects of pig\|dung, summer maize residue (MR) and winter wheat residue (WR) applied alone or in combination with fertilizer P (FP, 10?mg·kg^(-1)) on the characteristics of phosphate adsorption and forms of phosphorus in a calcareous soil were investigated in a 15 week long incubation study. The results showed that the additions of either DR, MR, WR alone or in combination with fertilizer P, could decrease the P sorption capacity and increase the P availability. Compared with the control, NaHCO_3 extractable P_i and P_o was increased by 6.0?mg·kg^(-1) and 5.6?mg·kg^(-1) in the treatment of MR alone, and NaOH extractable P_o was increased by 12.7?mg·kg^(-1) at the end of 15\|week incubation. NaHCO_3 extractable P_i and P_o were increased by 7.1?mg·kg^(-1) and 5.4?mg·kg^(-1) in the treatment of DR alone as compared with the control, and NaOH extractable P_o was increased by 14.1?mg·kg^(-1). A linear form of the Langmuir equation was used to evaluate the P adsorption, binding energy constant, P adsorption buffer capacity and the standard P requirement. These values all differed significantly between treatments, and the highest were all found for the control, and the lowest were all found for the DR. It also indicated that these three types of organic matter had promoted P availability in calcareous soil.
出处
《环境科学学报》
CAS
CSCD
北大核心
2004年第3期440-443,共4页
Acta Scientiae Circumstantiae
关键词
有机物
秸秆
有机磷
磷肥
石灰质
土壤
环境污染
crop residue
P fractions
Langmuir equation
P adsorption parameters
