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通过对西沙群岛９个主要岛屿、１２个剖面的５２个土壤样品的分析研究，发现西沙群岛土壤磷的含量有从海岸向内陆递增的趋向；土壤全磷量中无机Ｐ占优势，而有机Ｐ的含量随土壤有机质含量的增加而提高；土壤无机Ｐ形态以磷酸钙盐（Ｃａ一Ｐ，以下仝）占绝对优势（占９８％以上），其他铁，铝磷酸盐［Ｆｅ（ＡＬ）一Ｐ］和闭蓄态磷（Ｏ一Ｐ）含量很微，因而磷的有效性很高，构溶Ｐ占无机Ｐ总量的３０％左右；西沙群岛的磷质石灰土──“海鸟磷矿”属于中品位磷矿，具有直接作为磷肥使用的价值。）；对作物有效的构溶Ｐ主要来自无机Ｐ中的Ｃａ一Ｐ，构溶Ｐ与无机Ｐ，Ｃａ一ｐ间的相关系数（ｒ分别为０．９３和０．８７）大于构溶Ｐ与有机Ｐ（ｒ＝０．７１）；土壤有效Ｐ与全磷相关密切，而无机Ｐ、有机Ｐ与有效Ｐ的相关程度相近，说明有效Ｐ均受两者的影响；有机Ｐ含量与土壤有机质相关极显著，有机质含量愈高有机Ｐ比例愈大，而构溶Ｐ比例随土壤有机质的增加而相对减少。参考文献
Through the analysis of 52 soil samples in 9 major islands and 12 sections of the Xisha Islands, it was found that the content of phosphorus in the Xisha Islands tended to increase from the coast to the inland; the inorganic P was dominant in the total phosphorus in the soil, The contents of P increased with the increase of soil organic matter content. The inorganic P forms dominated by calcium phosphate (Ca-P, the same below) accounted for more than 98% P] and closed-state phosphorus (O-P) content is very small, and thus the effectiveness of phosphorus is very high, the formation of dissolved P accounted for about 30% of the total amount of inorganic P; Xisha islands of phosphorus lime soil ─ ─ “seabird phosphorus Mine ”belongs to the grade of phosphate rock, with the direct use of phosphate value. ). The effective solubilization of crop P mainly came from Ca-P in inorganic P, the correlation coefficient (r = 0.93 and 0.87, respectively) between dissolved P and inorganic P and Ca-P was greater than that of dissolved P and Organic P (r = 0.71). Soil available P was closely related to total phosphorus. However, the correlation between inorganic P and organic P was similar to that of available P, indicating that effective P was affected by both. Organic P content was correlated with soil organic matter Extremely significant. The higher the content of organic matter is, the greater the proportion of organic P is, while the proportion of solution soluble P is relatively decreased with the increase of soil organic matter. references