Relationships between plant community''''s species diversity and soil factors on Otingdag sandy land
浑善达克沙地植物群落物种多样性与土壤因子的关系

Based on the plot investigation sandy land in August 2004, the richness data about the plant communities on the Otingdag index, Shannon-Wiener index, Simpson index and Pielou index of 21 types of plant communities on moving and semi-moving dune, fixed dune, in- ter-dune lowland, and lake-brim were compared, and the relationships between the biodiversity indices and soil factors were studied by employing correlation analysis. The results showed that on moving and semi-moving dune, the richness index and Shannon-Wiener index of the plant communities were the lowest, while the Simpson index was higher and the Pielou index was the highest. On fixed dune, the richness index and Shannon-Winner index of the communities were the highest, while the Simpson index was the lowest. On inter-dune lowland and lake-brim, the richness index and Shannon-Wiener index of the communities were higher than those on moving and semi-moving dune but lower than those on fixed dune, and the Simpson index was higher than that on fixed dune but the Pielou index was lower than that on moving and semi-moving dune. The correlation analysis showed that soil pH value and total N content had significant effects on the Pielou index, and soil organic matter content had significant effects on the richness index.