海南岛五指山土壤指纹电荷特征及影响因素研究

Charge Fingerprint and Its Main Affecting Factors of Perudic Luvisol and Perudic Cambisols on Wuzhi Mountain, Hainan Island

采用指纹电荷法(chargefingerprint)研究了海南岛五指山土壤指纹电荷特征及其与土壤有机质、pH、土壤黏粒含量、交换性H、交换性Al等之间的关系。结果表明:在本研究所设定的土壤pH范围(7.0、6.4、5.8、5.2、4.6、4.0)内,土壤指纹电荷随土壤pH的降低而减少;土壤指纹电荷与土壤有机质、pH、交换性H、交换性Al等之间极显著相关。研究显示,土壤黏粒含量对土壤养分的保持能力在低pH条件下比在高pH条件下显得更为重要。在实际工作中可用有机质含量、pH、黏粒含量(体积%)、交换性H、交换性Al含量等常规理化指标来计算出指纹电荷,作为判断土壤养分保持能力及预测土壤酸化影响的一个重要指标。

Characteristics of charge fingerprint and its contributing factors of soils on the Wuzhi Mountain in Hainan Island were studied. The results illustrated that charge fingerprint of the soils decreased with pH （7.0, 6.4, 5.8, 5.2, 4.6, 4.0）; and it was significantly correlated with soil organic matter, pH, clay content, exchangeable hydrogen and exchangeable aluminum. Regression analysis found that clay content was more important in the situation of low pH for conservation of soil nutrients. Charge fingerprint could be calculated based on some conventional physio-chemical indexes, such as soil organic matter, pH, clay content, exchangeable hydrogen, exchangeable aluminum, etc. and it could be used as a major index to assess nutrient holding capacity and predict potential impact of soil acidification on nutrient loss.