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本文对夏玉米秸秆(MR)和冬小麦秸秆(WR)单施或者与P肥混施(在等P量条件下)对石灰性土壤P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MR和WR单施,还是秸秆与P肥混施,都可以减少土壤对P的吸附量,提高土壤P的活性,其中秸秆单施处理的活性无机磷(Pi)和有机磷(Po)(NaHCO3-P或者NaOH-P)提高较大,夏玉米秸秆单施时,比对照(CK)增加Pi、Po的量分别达6.0、5.6mgkg-1(NaHCO3-P),增加NaOH-Po为12.7mgkg-1。并通过Langmuir方程求得P的最大吸附量(b)、P吸附结合能常数(k)、P素最大缓冲量(MPBC)、标准需P量(SPR)的值,进一步说明了两种秸秆均可使土壤对P的吸附能力降低,增加土壤中P的活性。
In this paper, we conducted a 15-week laboratory simulation of the sorption characteristics and morphological changes of P in calcareous soils under either single application of maize straw (MR) or winter wheat straw (WR) The results showed that both the application of MR and WR, or the combination of straw and P fertilizer could reduce the amount of soil P adsorption and increase the activity of P in soil. Among them, the active inorganic phosphorus (Pi) And organic phosphorus (NaHCO3-P or NaOH-P) increased greatly. When the amount of Pi and Po were increased by 6.0 and 5.6 mgkg-1 (NaHCO3-P) , Increasing NaOH-Po to 12.7 mg kg-1. The maximum adsorption amount of P (b), the P adsorption binding energy constant (k), the maximum P buffer (MPBC) and the standard required P amount (SPR) were obtained by Langmuir equation. Can reduce soil P adsorption capacity, increase the activity of P in the soil.