摘要
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。
The effects of summer maize residue (MR) and winter wheat residue (WR) applied alone or in combination with fertilizer P (FP) on the characteristics of phosphate adsorption and forms of phosphorus in a calcareous soil were carried out in a 15 week long incubation study (keeping constant at 10 mg P kg^(-1)). The results showed that either MR, WR alone or in combination with fertilizer P could decrease the P adsorption capacity and increase the P availability. The magnitude of increase in NaOH-Po and NaOH-Pi of MR and WR alone by 6.0 and 5.6mg kg^(-1) against CK, and NaOH-Po was by 12.7 mg kg^(-1) at the end of 15 week long incubation. A linear form of the Langmuir equation was used to evaluate the P adsorption maximum, bonding energy constant, P adsorption buffer capacity and the standard Prequirement. These values all differed significantly between treatments, and the highest was found for the CK, and the lowest for the MR. It indicated that these two kinds of crop residues promoted P availability in calcareous soil.
出处
《土壤通报》
CAS
CSCD
北大核心
2004年第2期177-180,共4页
Chinese Journal of Soil Science
基金
国家自然科学基金资助项目(40071053)
