Investigation and pollution evaluation of soil in Neilingding Island，Guangdong Province

In this study，the soil fertility and quality in the Neilingding Island，a national natural conservation area，were investigated to provide a basis for its ecological protection and rational utilization. Samples were collected from soil profiles and analyzed for fertility and total heavy metals，and the results were compared with those of 1997 so as to know soil fertility and total heavy metal changes of 4 types of soils in Neilingding Island. The results showed that fertility did not change apparently，soil pH decreasd to some extent，and total heavy metals except total Cr increased by various degrees，compared with in 1997. For the heavy metals，Mn had the largest increase of 362.3%，while Pb had the smallest of 29.38%. For the 4 types of soils，metamorphic latosolic red soil showed high fertility，while costal sandy soil and rocky soil had low fertility. Generally，the soils had acidification，and the total heavy metals increased considerably，but were still within the safety margin.