基于HNSOTER的海南岛土壤有机碳储量及空间分布特征分析

基于海南岛1∶200 000土壤 地体数字化数据库（HNSOTER），在GIS系统的支持下，对海南岛土壤有机碳储量及分布特征进行了探讨.结果表明，1）标准剖深下（0～100 cm），海南岛土壤有机碳储量为2.78×10⁸ t.2）0～20 cm剖深土壤有机碳密度变幅在0.3～18.8 kg·m^-2之间，其中1.0～5.0 kg·m^-2密度区占总分布面积的81.2%，按面积加权均值为3.3 kg·m^-2.0～100 cm剖深的土壤有机碳密度变幅在1.0～32.1 kg·m^-2 之间，其中2.0～14.0 kg·m^-2密度区面积比重占89.7%，按面积加权均值为8.4 kg·m^-2.不同地形、岩性及土壤类型中，土壤有机碳密度分布有较大变异.3）从中部山地向外至沿海平原，土壤有机碳密度总体上呈递减趋势，但不同剖深下其分布格局仍有一定差异.0～20 cm剖深下土壤有机碳密度高值区（丰富度指数大于1）主要分布于山地以及北部玄武岩台地，0～100 cm剖深下，有机碳密度高值区（丰富度指数大于1）趋向集中于中东部山地、台地区，且其分布重心较前者明显的向东偏移.

Soil organic carbon storage and its spatial distribution characteristics in Hainan Island: a study based on HNSOTER

The study based on HNSOTER and supported by GIS showed that in Hainan Island, the total amount of soil organic carbon in the standard profile depth of 0 - 100 cm was about 2.78 x 10(8) t, and the soil organic carbon density in 0 - 20 cm and 0 - 100 cm profile depth was 0.3 - 18.8 kg x m(-2) and 1.0 - 32.1 kg x m(-2), with an area-weighted means of 3.3 kg x m(-2) and 8.4 kg x m(-2), respectively. Soil organic carbon density varied significantly with different landform, lithology and soil, which tended to decrease from the mountains in the middle part of Hainan Island to its coastal plain, and had some differences between 0 - 20 cm and 0 - 100 cm profile depth. The areas of high soil organic carbon density in 0 - 20 cm profile depth were mainly distributed in the mountains and northern basalt tableland, while those in 0 - 100 cm profile depth were in the middle-eastern mountains and tableland. The distribution center of soil organic carbon density in 0 - 100 cm profile depth had a significant shift to the eastern part, compared with that in 0 - 20 cm profile depth.