海南岛东寨港红树林盐土的理化性状

Study on Physi-chemical Properties of the Saline Soil of Mangroves at Dongzhaigang,Hainan Island

采用常规方法研究了海南岛东寨港红树林盐土(酸性硫酸盐土)的理化性状。结果表明:各土层土粒密度平均值为2.2g/cm3,剖面上不同深度间变化小,有缓慢的下降趋势;平均土壤容重1.2g/cm3,大多数介于1.1～1.5g/cm3之间,属于粘质土壤;平均土壤含水量17.7%,不同土层无规律变化;剖面上绝大部分土层的土壤孔隙度在30%～60%之间,平均47.2%;土壤pH值为4.5,平均有机质含量(质量分数)w为130.10g/kg;土壤水溶性盐分平均含量15.03g/kg(9.15～16.60g/kg),硫酸根含量w(SO42-)平均为0.990g/kg,远高于当地其它土壤;平均有效磷含量为3.690mg/kg;水解性氮在不同深度的土壤剖面中分布无规律,平均值为49.022mg/kg;土壤速效钾含量高,平均值高达127.445mg/kg;土壤有效硫含量高,平均值高达118.740mg/kg,都明显高于其它土壤。

Conventional methods were used to determine the physi-chemical properties of the saline soil （acide sulfate soil） of Mangroves at Dongzhaigang, Hainan Island in order to provide some information for amelioration and sustainable use of acid sulfate soil. The soil particle density of different soil layers was found to average 2.2 g/cm3, showing a slow downward trend in the soil profile. The soil bulk density averaged 1.2 g/cm3, most of which is between 1.1 g/cm3 and 1.5 g/cm3, and hence the soil texture is clay. The soil water content was 17.7% by average, and was not regularly distributed in the soil profile. Most of the soil porosities were between 30% and 60%, with an average being 43.2%. The soil pH averaged 4.5. The organic matter content in the soil averaged 130.10 g/kg. The soluble salt content varied from 9.15 g/kg to 16.60 g/kg, with an average of 15.03 g/kg, showing a downward trend. And the SO4^2- content was 0.990 g/kg, much higher than that of the other local soils. The contents of available phosphorus, hydrolysable nitrogen, available potassium and available sulfur averaged 3.690 mg/kg, 49.022 mg/kg, 127.445 mg/kg, and 118.740 mg/kg, respectively, all higher than those in the local soil distinctly.