海南胶园不同母质发育砖红壤磷素形态特征研究

采用Hedley磷分级方法对海南胶园5种母质15个砖红壤磷素形态进行了研究。结果表明:由于变幅较大,砂页岩、花岗岩、片麻岩、浅海沉积物和玄武岩5种母质砖红壤Resin-P含量间、NaHCO3-Pi含量间、NaOH-Pi含量间和HCl-P含量间差异均不显著。所有土壤各级磷中残余态磷含量和百分比均最高,且玄武岩发育砖红壤上残余态磷含量和百分比含量均显著高于其他4种母质砖红壤。5种母质砖红壤中浅海沉积物发育砖红壤有机磷总量最低,所有土壤有机磷占全磷百分比的平均值为14.67%;除浅海沉积物发育砖红壤外,其他4种母质发育砖红壤上有机磷均以NaOH-Po为主,其占有机磷总量百分比的平均值为83.68%。Resin-P、NaHCO3-Pi、NaOH-Pi和HCl-P 4个无机磷组分含量间显著或极显著水平正相关,且均与土壤Bray 2提取态磷呈极显著的正相关。NaHCO3-Po和NaOH-Po两个有机磷组分含量间呈极显著正相关,NaHCO3-Po、土壤有机磷总量均与土壤有机质含量呈显著正相关。

Phosphorus Fractions of Latosols Developed from Different Parent Materials in Rubber Plantation of Hainan Province

Hedley's sequential extraction method was used to investigate the inorganic and organic P fractions of fifteen latosols with different parent materials in rubber plantations of Hainan Province. Results showed that: there were no significant difference among resin-P of latosols, NaHCO3-Pi of latosols, NaOH-Pi of latosols, HCl-P of latosols developed from sand shale, granite, gneiss, neritic sediment and basalt. All soils studied were dominated by residual-P, residual-P and percentage of residual-P/total P of latosols developed from basalt were significantly higher than that developed from the other four parent materials(p<0.05). Total organic P content of the soils developed from neritic sediment were significant lower than that developed from the other four parent materials (p<0.05), organic phosphorus in all soils studied represented an average of 14.67% of the total soil P. Except the soils from neritic sediment, soil organic P fraction of the soils from sand shale, granite, gneiss and basalt were mainly occurred in NaOH-Po, which represented an average of 83.68% of total soil organic P. resin-P, NaHCO3-Pi, NaOH-Pi, HCl-P were positive correlated with each other(p<0.05), which were all positive correlated with soil Bray 2-P(p<0.05). NaHCO3-Po was positive correlated with NaOH-Po(p<0.01), NaHCO3-Po and soil total organic P were both positive correlated soil organic matter(p<0.05).