Subjects: Biology >> Botany >> Plant ecology, plant geography submitted time 2016-05-03
Abstract： ：Abstract The main distribution areas of tropical virgin forests in Jianfengling (JFL), Bawangling (BWL), Wuzhishan (WZS), Diaoluoshan (DLS), Yinggeling (YGL) of Hainan Island were selected, and the 100 cm deep soil samples were sampled and analyzed. SOC density in its areas were estimated by soil vertical fitting method and soil stratification method to discover its soil organic carbon distribution characteristic in tropical virgin forests of Hainan Island. Results showed that: (1) The average SOC densities using soil vertical fitting method in these regions were 14.98, 18.46, 16.48, 18.81, 16.66 kg?m–2, respectively,. The SOC densities using soil stratification method were 14.73, 16.24, 15.50, 16.91, 15.03 kg?m–2, respectively. The former was significantly higher than the latter (p < 0.05). Soil vertical fitting method was available used for calculating SOC density when soil was natural soil without disturbance. (2) The proportions of the first 0–30 cm interval related to the total content of the 1 m profile in these areas are 50.50%, 48.56%, 43.49%, 47.37% , 42.88%, respectively. (3) There was significantly negative correlation between SOC density and Shannon-Wiener index, Simpson index, species richness, soil bulk density; significantly positive correlation between SOC density and altitude, soil porosity, soil nitrogen. However, there was no significantly correlation between SOC density and slope, biomass, average diameter at breast height, average height. (4) Hainan the study area was located in the low latitudes, the rich rainfall and high temperature conditions which accelerated the decomposition of organic matter and nutrient recycling, which result in that SOC densities in tropical virgin forests of Hainan Island were significantly lower than that of SOC density in China.
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