EFFECTS OF PHOSPHORUS CONCENTRATION AND pH ON PHOSPHATE RETENTION BY ACTIVE ALUMINUM AND IRON OF ANDO SOILS
EFFECTS OF PHOSPHORUS CONCENTRATION AND pH ON PHOSPHATE RETENTION BY ACTIVE ALUMINUM AND IRON OF ANDO SOILS
复制标题
磷浓度和pH值对安藤土活性铝和铁固磷的影响
DOI：
10.1097/00010694-198111000-00004
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
K. Wada
中科院分区：
文献类型：
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作者：
Noriaki Gunjigake;K. Wada
我们测量了18个Ando土壤样品在不同pH值(4到8.5)和磷浓度(10-3到2 M)下的磷保留量。每种土壤的一般回归方程为：Log Y=αpH+βLog[C]+c，其中Y=磷保留量，[C]=磷浓度。通过多元回归分析，Y值与焦磷酸盐、二亚硫酸盐-柠檬酸、草酸-草酸选择性溶解分析的铝和铁的状态相关。与腐殖质Alpyr结合的铝与磷酸盐的反应不依赖于pH，对磷的浓度有显著影响，而尿磷矿中的铝和铁，(Al+Fe)oxa，对pH有显著的依赖关系，对磷浓度有中等程度的影响。类透膜组分(Al+Fe)DIT-PYR中的铝和铁表现出与腐殖质结合的铝相似的特征。在0.5M时，铝和铁对磷酸盐(P/Al或Fe)的摩尔反应性依次为：(Al+Fe)dit-Pyr(0.3)<；(Al+Fe)oxa(0.4)<；Alpyr(0.5)<；FePyr(0.8)；(Al+Fe)oxa(<；0.1)<；(Al+Fe)dit-pyr(0.3)<；Alpyr(0.6)，pH 8.0。
We measured phosphate retention by 18 Ando soil samples at different pH values (4 to 8.5) and phosphorus concentrations (10-3 to 2 M). A general regression equation held for each soil: log Y = α pH + β log [C] + c, where Y = phosphorus retention and [C] = phosphorus concentration. By multiple regression analysis, the Y values were correlated with the status of aluminum and iron analyzed by selective dissolution using pyrophosphate, dithionite-citrate, and oxalate-oxalic acid as reagents. Aluminum bound with humus, Alpyr, reacted with phosphate depending little on pH and markedly on phosphorus concentration, whereas aluminum and iron in allophane, (Al + Fe)oxa, depending markedly on pH and moderately on phosphorus concentration. Aluminum and iron in allophanelike constituents (Al + Fe)dit-pyr showed features similar to aluminum bound with humus. The molar reactivity of aluminum and iron toward phosphate (P/Al or Fe) at 0.5 M increased in the order: (Al + Fe)dit-pyr (0.3) < (Al + Fe)oxa (0.4) < Alpyr (0.5) < Fepyr (0.8) at pH 5.0, and (Al + Fe)oxa (<0.1) < (Al + Fe)dit-pyr (0.3) < Fepyr (0.5) < Alpyr (0.6) at pH 8.0.