Effects on Understory Vegetation Diversity and Soil Fertility of Continuous Planting of Eucalyptus
This study analyzed understory vegetation and soil properties of Eucalyptus plantations with different planting durations,T1(13 years)and T2(18 years),and explored effects of continuous Eucalyptus planting on understory vegetation diversity and soil fertility.The results indicated that continuous planting of Eucalyptus reduced herbaceous diversity,nutrient content,and biomass of the understory vegetation.The Margalef richness index,Simpson dominance index,Shannon-Wiener diversity index,and Pielou evenness index for herbaceous plants in T1 were all higher than those in T2,and the nutrient storage of understory vegetation in T1 was significantly greater than that in T2.Continuous Eucalyptus planting also decreased soil fertility,with the comprehensive soil fertility index for T1 being 0.627,which was significantly higher than that of T2.The ranking of comprehensive soil fertility indices across different soil layers was as follows:0～10 cm>10～20 cm>20～40 cm.Correlation analysis showed a significant positive correlation between understory herbaceous diversity and the comprehensive soil fertility index in 0～10 cm layer.
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