Relating soil phosphorus indices to potential phosphorus release to water
Relating soil phosphorus indices to potential phosphorus release to water
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DOI：
10.2134/jeq2000.00472425002900040018x
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发表时间：
2000-07-01
影响因子：
2.4
通讯作者：
Truesdale, VW
中科院分区：
文献类型：
--
作者：
Hooda, PS;Rendell, AR;Truesdale, VW
土壤测试磷（STP）和释放的P在地表和地下径流之间的关系，需要帮助确定源区域实施管理策略，以限制磷流失到水中。为了确定是否可以通过STP值，吸附-解吸指数，或土壤饱和度与磷（DSSP），11个站点的对比化学性质和管理历史进行了采样从长期的田间试验在英国的土壤磷释放预测。每个地点提供最多三种处理方法，总共产生29个土壤样本。结果表明，连续稀释法解吸的磷量与土壤全磷含量和磷吸附量无关。最显著的特性是磷饱和度。DSSP值低于10%时，几乎没有解吸;高于此点时，解吸的P量随DSSP线性增加。比较了五种STP方法（Olsen、Mehlich-3、酸化草酸铵-草酸、Fe 2 O3-涂布纸条和蒸馏水），以预测其预测潜在P释放到水中的有效性。虽然STP值得到使用酸化草酸铵证明是最有效的，用水提取的最好的相关性与解吸的P量。占96%的差异磷释放从土壤中的变异。
Relationships between soil test phosphorus (STP) and release of P in surface and subsurface runoff are needed to help identify source areas for implementing management strategies to limit P loss to water. To determine whether soil P release could be predicted either by STP values, sorption-desorption indices, or the degree of soil saturation with phosphorus (DSSP), 11 sites with contrasting chemical properties and management histories were sampled From long-term field trials in the UK. Each site offered up to three treatments, resulting in a total of 29 soil samples. The results showed that the amount of P desorbed using a successive dilution procedure had no relationship with either total soil P content or P sorption capacity. The most significant property was the extent of P saturation. There was little desorption for DSSP values below 10%; above this point, the amount of P desorbed increased linearly with the DSSP, Five STP methods (Olsen, Mehlich-3, acidified ammonium oxalate-oxalic acid, Fe2O3-coated paper strip, and distilled water) were compared to predict their effectiveness in predicting potential P release to water. While STP values obtained using acidified ammonium oxalate proved to be least effective, those extracted with water correlated best with the amount of P desorbed. accounting for 96% of the variability in differential P release from the soils.