海南岛东北部红树林盐土的化学性质

The Chemical Properties of the Mangrove Solonchak in the Northeast Part of Hainan Island

研究结果表明,海南岛红树林盐土呈强酸性和酸性。其酸度与红树富硫有密切关系。土壤阳离子交换量随剖面深度而减少。土壤水溶性Cl^-与Na^+含量,SO_4^(2-)含量与 Ca^(2+)和Mg^(2+)合量紧密相关。土壤中磷在表层明显积累,钙、铁、锰在表层有所淋溶,钛、钾在剖面分布较均匀,硅、铝上下层多少不定。

The mangrove solonchak is very wide distribution in the Chinese coast of the tropics and the southern subtropics. The chemical properties and characteristics of the mangrove solonchak in the northeast part of Hainan Island were studied. Main results obtained summarized as follows: 1. The soil is the acidity or the strongly acidity, pH2.62-6.10. The pH decreases as the soil depth increase. 2. The content of the soil water-soluble ion, Cl- and Na+, SO42- and (Ca2++Mg2+) are positive correlation. In every soil layer, the content of the water- soluble Cl- approximates to Na+. 3. The content of P2O5 and the cation exchange capacity in the soil decreases as the depthe increase. They are evidently higher in the surface soil than the lower layer, but the content of TiO2 and K2O changes a little only.