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为探讨热带亚热带森林,尤其城市及其周边地区残存森林土壤磷的有效性,对佛山地区14个残存林(7个自然林和7个人工林)的0～3 cm和3～23 cm矿质土壤的P有效性进行研究。结果表明,铁结合态无机P和还原剂可溶解无机P是土壤无机P的主要组分。在0～3 cm矿质层中,自然林土壤铝结合态无机P、Bray 1提取无机P和总无机P含量显著高于人工林;而在3～23 cm矿质土层中,自然林土壤钙结合态无机P含量显著高于人工林。其它土壤营养指标在自然林和人工林间差异不显著。相关分析结果表明,土壤有机质含量与钙结合态无机P除外的其它无机P组分含量均成显著正相关。聚类分析结果表明14个残存林土壤P有效性可分成3组,整体上人工林土壤P有效性比自然林低。这有助于认识城市化影响下城市及其周边地区残存森林土壤营养状况及加强养分管理。
In order to explore the availability of soil phosphorus in the remnant forest in the tropical and subtropical forests, especially in the urban and surrounding areas, the effects of 0 ~ 3 cm and 3 ~ 23 cm mineral soils in 14 remaining forests (7 natural forests and 7 plantations) The P validity of the study. The results showed that the inorganic P, which is the iron-bound inorganic P and the reductant, is the main component of inorganic P in soil. In 0 ~ 3 cm mineral layer, the content of inorganic P, inorganic P and total inorganic P in the natural forest soil was significantly higher than that in the plantation, while in the mineral layer of 3 ~ 23 cm, the soil calcium Inorganic P content was significantly higher than the plantation. Other indicators of soil nutrition in the natural forest and plantation difference was not significant. Correlation analysis showed that soil organic matter content was significantly and positively correlated with other inorganic P components except calcium-bound inorganic P. The results of cluster analysis showed that P availability of soil in 14 remaining forests could be divided into three groups, and the overall availability of soil P in artificial forests was lower than that in natural forests. This helps to understand the nutritional status of soil in remnants forests and enhance nutrient management in urban and surrounding areas affected by urbanization.