纳板河流域不同植被类型下土壤肥力综合评价

研究橡胶林土壤有机碳组分及理化性状间的关系，为中国植胶区土壤质量和天然橡胶产业高效发展提供理论依据。

以海南琼中大丰农场5种林龄(2、9、12、27和31龄)橡胶林土壤样品为研究对象，用农化分析方法测定土壤理化性质和有机碳组分含量。

(1) 9龄橡胶林土壤pH最高，31龄橡胶林土壤含水量最高且容重最低，各林龄全氮、全磷和全钾含量分别低于、等于和高于全国水平。(2) 不同林龄橡胶林土壤有机碳各组分含量存在差异，其中总有机碳含量为4.58~8.52 g/kg，易氧化有机碳含量为1.72~4.66 g/kg，稳定态有机碳含量为2.05~3.27 g/kg，水溶性有机碳含量为0.23~0.48 g/kg。(3) 土壤总有机碳含量与易氧化有机碳含量、稳定态有机碳含量呈极显著正相关(P<0.01)，相关系数分别为0.321和0.333。

27和31龄橡胶林因林下积累有机物较多，其土壤有机碳组分含量高于低林龄橡胶林；2龄橡胶林因刚定植，林下植被裸露，12龄橡胶林因已开割，因此，有机物流失均较多。

One health: soil health and its link with human health

To study the relationship between organic carbon components and physicochemical properties of rubber forest soil, providing theoretical basis for soil quality and efficient development of natural rubber industry in China. Several soil physicochemical properties and soil organic carbon components were tested by agrochemical analysis method in five rubber plantation soil samples (2, 9, 12, 27 and 31 a) of Qiongzhong Dafeng Farm in Hainan Province. 1) The soil pH in 9-age rubber plantations was the highest, the water content of 31-age rubber plantations was the highest and the bulk density was the lowest. The contents of total nitrogen, total phosphorus and total potassium in each forest age were lower than, equal to and higher than the national level, respectively. 2) The contents of soil organic carbon in different aged rubber plantations were different. The content of total organic carbon changed from 4.58 to 8.52 g/kg, the content of easily oxidized organic carbon changed from 1.72 to 4.66 g/kg, and the content of stable organic carbon changed from 2.05 to 3.27 g/kg, the content of water-soluble organic carbon changed from 0.23 to 0.48 g/kg. 3) The content of total soil organic carbon was extremely positively correlated with the content of easily oxidized organic carbon and the content of stable organic carbon (P<0.01), with correlation coefficients of 0.321 and 0.333, respectively. The soil organic carbon content of 27 and 31 aged rubber plantations is higher than that of low aged rubber plantations because of the accumulation of organic matter under the forest. Due to rigid planting, the vegetation under the 2-age rubber forest is exposed, and the 12-age rubber forest is cut, so the organic matter loss is more.