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首页> 外文期刊>Soil Biology & Biochemistry >Surface runoff phosphorus (P) loss in relation to phosphatase activity and soil P fractions in Florida sandy soils under citrus production.
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Surface runoff phosphorus (P) loss in relation to phosphatase activity and soil P fractions in Florida sandy soils under citrus production.

机译：柑橘生产下佛罗里达沙质土壤中地表径流磷（P）的损失与磷酸酶活性和土壤P组分的关系。

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Phosphorus losses by surface runoff from agricultural lands have been of public concern due to increasing P contamination to surface waters. Five representative commercial citrus groves (C1-C5) located in South Florida were studied to evaluate the relationships between P fractions in soils, surface runoff P, and soil phosphatase activity. A modified Hedley P sequential fractionation procedure was employed to fractionate soil P. Soil P consisted of mainly organically- and Ca/Mg-bound P fractions. The organically-bound P (biological P, sum of organic P in the water, NaHCO3 and NaOH extracts) was dominant in the acidic sandy soils from the C2 and C3 sites (18% and 24% of total soil P), whereas the Ca/Mg-bound P (HCl-extractable P) accounted for 45-60% of soil total P in the neutral and alkaline soils (C1, C4 and C5 soils). Plant-available P (sum of water and NaHCO3 extractable P fractions) ranged from 27 to 61 mg P kg-1 and decreased in the order of C3 & C4 & C1 & C2 & C5. The mean total P concentrations (TP) in surface runoff water samples ranged from 0.51 to 2.64 mg L-1. Total P, total dissolved P (TDP), and PO43--P in surface runoff were significantly correlated with soil biological P and plant-available P forms (p&0.01), suggesting that surface runoff P was directly derived from soil available P pools, including H2O- and NaHCO3-extractable inorganic P, water-soluble organic P, and NaHCO3- and NaOH-extractable organic P fractions, which are readily mineralized by soil microorganisms and/or enzyme mediated processes. Soil neutral (55-190 mg phenol kg-1 3 h-1) and natural (measured at soil pH) phosphatase activities (77-295 mg phenol kg-1 3 h-1) were related to TP, TDP, and PO43--P in surface runoff, and plant-available P and biological P forms in soils. These results indicate that there is a potential relationship between soil P availability and phosphatase activities, relating to P loss by surface runoff. Therefore, the neutral and natural phosphatase activities, especially the natural phosphatase activity, may serve as an index of surface runoff P loss potential and soil P availability..
机译：由于对地表水的磷污染增加，农田的地表径流造成的磷损失已引起公众关注。研究了位于南佛罗里达州的五个有代表性的商业柑橘林（C1-C5），以评估土壤中P含量，地表径流P和土壤磷酸酶活性之间的关系。采用改良的Hedley P顺序分馏程序对土壤P进行分馏。土壤P主要由有机结合的和Ca / Mg结合的P部分组成。有机结合的磷（生物磷，水中有机磷的总和，NaHCO3和NaOH提取物）在C2和C3站点的酸性沙质土壤中占主导地位（分别占总土壤P的18％和24％），而Ca在中性和碱性土壤（C1，C4和C5土壤）中，/ Mg结合的P（HCl可萃取的P）占土壤总P的45-60％。植物可用的P（水和NaHCO 3可提取的P部分的总和）的范围为27至61mg P kg-1，并且以C 3＞ C 3的顺序降低。 C4＞ C1＞ C2＞ C5。地表径流水样品中的平均总P浓度（TP）为0.51至2.64 mg L-1。地表径流中的总磷，总溶解磷（TDP）和PO43--P与土壤生物磷和植物有效磷形态显着相关（p <0.01），表明地表径流P直接来自土壤可利用磷库包括H2O和NaHCO3可萃取的无机P，水溶性有机P以及NaHCO3和NaOH可萃取的有机P馏分，它们很容易被土壤微生物和/或酶介导的过程矿化。土壤中性（55-190 mg苯酚kg-1 3 h-1）和天然磷酸酶活性（77-295 mg苯酚kg-1 3 h-1）与TP，TDP和PO43- -P在地表径流中以及在土壤中可利用的P和生物P形式。这些结果表明，土壤磷的有效性与磷酸酶活性之间存在潜在的关系，与地表径流造成的磷损失有关。因此，中性和天然磷酸酶活性，尤其是天然磷酸酶活性，可以作为地表径流磷损失潜力和土壤磷有效性的指标。

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