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首页> 外文期刊>Soil Science >PHOSPHORUS SUPPLY TO PLANTS BY SOILS WITH VARIABLE PHOSPHORUS EXCHANGE
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PHOSPHORUS SUPPLY TO PLANTS BY SOILS WITH VARIABLE PHOSPHORUS EXCHANGE

机译：不同磷素交换条件下土壤对植物的磷供应

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Soil phosphorus (P) supply to plants increases with concurrent increases in both soil solution P (C-P) and P exchanged between the solution and the soil solid phase that rapidly equilibrates with C-P. For many temperate region soils, the amount of P isotopically exchanged in 1 min (E(1)) acts as an immediate source of replenishment for C-P. Relationships between E(1) and C-P were investigated to characterize the Intensity (C-P), Quantity (E(1)) and Capacity (dE(1)/dC(P)) factors of soil P supply to plants. Soil (Alfisol) samples were collected from seven P fertilization field experiments conducted in France over a period of 4 to 32 years. The E(1)/C-P curves are described by the same equation for the seven experiments: E(1) = vC(P)(0.78) where v is the E(1) value at 1 mg P L(-1). The v constant is soil dependent and ranged from 14.7 to 28.3 mg P kg(-1). The above equation was validated by testing a previous published data set. The buffer power of P in solution controlled by E(1) (dE(1)/dC(P)) decreased when C-P increased. At a given C-P level, dE(1)/dC(P) increased when v constant increased. The E(1)/C-P curves might be used as a basis for transferring information on soil P supply from one soil to another. The present work proposed an equation based on the use of E(1)/C-P curves to predict the C-P value associated with an optimum crop yield in different soils (OPtCP). The optC(P) value is inversely related to the v value, indicating that the lower the P buffer power of soils, the higher the optC(P) value.
机译：随着土壤溶液P（C-P）的增加和溶液与土壤固相之间交换的P的快速增加，土壤磷（P）的供应量随之增加。对于许多温带地区的土壤，在1分钟内同位素交换的P量（E（1））可作为C-P的直接补充来源。研究了E（1）和C-P之间的关系，以表征土壤P供给植物的强度（C-P），数量（E（1））和容量（dE（1）/ dC（P））因子。土壤（Alfisol）样品是从法国在4至32年内进行的7个磷肥田间试验中收集的。 E（1）/ C-P曲线由七个实验的相同方程式描述：E（1）= vC（P）（0.78）其中v是1 mg P L（-1）时的E（1）值。 v常数取决于土壤，范围为14.7至28.3 mg P kg（-1）。通过测试先前发布的数据集验证了上述方程式。当C-P增加时，由E（1）控制的溶液中P的缓冲功率（dE（1）/ dC（P））减小。在给定的C-P水平下，当v常数增加时，dE（1）/ dC（P）增加。 E（1）/ C-P曲线可以用作将土壤磷供应信息从一种土壤转移到另一种土壤的基础。本工作提出了一个基于E（1）/ C-P曲线的方程，用来预测与不同土壤中最佳作物产量（OPtCP）相关的C-P值。 optC（P）值与v值成反比，表明土壤的P缓冲力越低，optC（P）值就越高。

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