SOTER支持下海南岛土壤侵蚀模拟与影响因子分析

SOTER-Dased Soil Water Erosion Simulation and Contribution Factor Analysis in Hainan Island

基于SOTER数据库,利用USLE方程对海南岛土壤的现实和潜在侵蚀量进行了定量估算,结果表明海南岛92.82%的面积土壤侵蚀量在500t/km2·a以下,侵蚀主要发生在中坡度坡地和高坡度丘陵区;而由于其所处的特殊气候区,潜在侵蚀量巨大,中度以上侵蚀面积达到全岛的90.67%。酸性常湿雏形土、铝质湿润雏形土和铁质湿润雏形土相对侵蚀程度大,粉砂岩、泥岩地区最容易发生侵蚀。

The actual and potential soil water erosion amounts were estimated based on the USLE and SOTER database of Hainan island. Results show that 92.82% of the whole island had a current erosion amount of lower than 500t/km2.a. The actual erosion area was mainly distributed over the low hill and mesa areas around mountains. The soil erosion hazard was high because on the abundant rainfall on the island. The potential soil erosion amount could be extremely high and 90.76% of the island could have an erosion higher than 2500t/km2.a without vegetation cover. Cambisols developed from silt-sandstone were most vulnerable to water erosion according to the analysis of the distribution pattern of the modeled data.