Changes in Olsen P in Relation to P Balance in Contrasting Agricultural Soils
Changes in Olsen P in Relation to P Balance in Contrasting Agricultural Soils
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DOI：
10.1016/s1002-0160(15)60072-8
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发表时间：
2016-10-01
期刊：
影响因子：
5.7
通讯作者：
Torrent, Jose
中科院分区：
文献类型：
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作者：
Diaz, Isabel;Torrent, Jose
将土壤磷保持在植物生长所需的适当水平，需要评估长期磷平衡(即磷输入和输出之间的差异)如何导致土壤测试磷的变化。在西班牙地中海地区农业区的39个地点进行了例行测量土壤性质可以帮助预测磷平衡到奥尔森磷的转换系数的假设。对每个地点的一组土壤样品进行了Olsen P、无机P(用0.5moL L-1H_2SO_4提取的P)、假全P(550℃点火后用0.5mol L~(-1)H_2SO_4提取的P)和有机P(假全P与无机P的差异)的分析。在39种土壤中，有机磷和奥尔森磷大部分不相关，这表明有机磷含量随磷的输入和输出变化不大。作为转换因子的两种不同量度，Olsen P对拟总P和无机P的回归直线斜率变化很大(约在0.03到0.25之间)，其平均值(约0.10)与在温带地区进行的长期实验中发现的-CO相似。两种转化系数与常规测定的土壤性质均无显著相关性，但石灰性土壤无机磷的转化系数显著低于非石灰性土壤。我们的负面结果表明，在未来的研究中，有必要将土壤性质的影响与与磷动态有关的管理系统和环境因素的影响分开。
Maintaining soil phosphorus (P) at adequate levels for plant growth requires assessing how the long-term P balance (viz., the difference between P inputs and outputs) results in changes in soil test P. The hypothesis that routinely measured soil properties can help predict the conversion factor of P balance into Olsen P was tested at 39 sites in agricultural areas of the Mediterranean region in Spain. A set of soil samples from each site was analyzed for Olsen P, inorganic P (P extracted using 0.5 mol L-1 H2SO4), pseudototal P (P extracted using 0.5 mol L-1 H2SO4 following ignition at 550 degrees C), and organic P (the difference between pseudototal P and inorganic P). Organic and Olsen P were uncorrelated in most of the 39 soil sets, which suggests that organic P content changed little with P inputs and outputs. The slopes of the regression lines of Olsen P against pseudototal and inorganic P, which were used as two different measures of the conversion factor, ranged widely (from 0.03 to 0.25 approximately), with their average values (about 0.10) being similar-CO those found in long-term experiments conducted in temperate areas. Neither conversion factor was significantly correlated with any routinely measured soil property; however, the conversion factor for inorganic P was significantly lower for calcareous soils than for noncalcareous soils. Our negative results suggest the need to isolate the influence of soil properties from that of management systems and environmental factors relating to P dynamics in future studies.