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海南岛地处热带季雨林砖红壤地带,适于热带经济作物生长。因其地理环境不一,各地的经济作物和土壤的地球化学特征均有差异。胶林土壤中的有机质含量约为1～2％,铜、锌、锰、镍、砷、镁、钙、钾含量与土壤母质和热带地区的强烈风化、淋溶有关,土壤剖面的微量元素往往因强烈的淋溶作用而淋失。我们发现铜元素明显累积于土壤剖面的底层。不过,橡胶树一般并不缺乏这些养分,胶树中钙、镁、钾的含量分别为0.05～1.44％,0.22～0.46％、0.46～1.02％。这三种元素累积在橡胶树根部。胶树在抽新叶的初期需要钙、镁、钾。我们用计算方法估算出橡胶林区的水、风化石,土壤和水中钙的含量。因风化而释放出来的钙每公顷每年为20～25公斤,而雨水给土壤带来的钙每公顷每年为22～30公斤。胶树归还给土壤的钙每公顷每年为240公斤。土壤中的钙含量每公顷为400～500公斤。用数字方法估算的结果表明,每公顷胶林每年钙循环流动量约为20～200公斤。
Hainan Island is located in tropical monsoon forest brick red soil zone, suitable for the growth of tropical cash crops. Because of their different geographical environments, there are differences in the geochemical characteristics of cash crops and soil around the country. The content of organic matter in the rubber forest soil is about 1-2%. The contents of copper, zinc, manganese, nickel, arsenic, magnesium, calcium and potassium are related to the strong weathering and leaching of soil parent material and tropical areas. The trace elements in the soil profile are often Leaching due to strong leaching effect. We found that copper was clearly accumulated on the bottom of the soil profile. However, the rubber tree is generally not lack of these nutrients, gum tree calcium, magnesium and potassium were 0.05 to 1.44%, 0.22 to 0.46%, 0.46 to 1.02%. These three elements accumulate in the roots of rubber trees. Gum tree in the initial pumping of new leaves need calcium, magnesium and potassium. We used the calculation method to estimate the rubber, water, fossil, soil and water calcium content. Calcium released by weathering is 20-25 kilograms per hectare per hectare, whereas rain brings about 22-30 kilograms per hectare of calcium per year to the soil. The return of gum trees to the soil is 240 kilograms per hectare per hectare. The amount of calcium in the soil is 400 to 500 kg per hectare. Calculated numerically, the results show that the annual circulation of calcium per hectare is about 20-200 kg.