Relationship between Damaged Soil Seed Bank and Aboveground Vegetation and Soil Properties in Post-Flooding Forests in Nanping City,Fujian Province,China
Soil seed bank is a survival strategy in the long evolutionary process of seed plants.Antecedent research on post-disaster soil seed banks primarily conducted on the characteristics,spatiotemporal changes,germination traits of seed banks,and their association with vegetation restoration at various stages after disasters such as earthquakes,fires,and desertification.Flood disasters had long-term and persistent destructive effects on soil seed banks,resulting in impairment of seed survival and germination potential in damaged ecosystems;unfortunately,less research achievements were made regarding post-flooding soil seed banks in relation to aboveground vegetation and soil factors.In this study,the post-flooding(damaged)plots,naturally recovered plots and undisturbed plots in the forests of northern Fujian Province of China were established for field survey.Soil seed banks,vegetation community and soil physicochemical properties under different degrees of recovery were analyzed by correlation and canonical correspondence analysis(Canonical Correspondence Analysis,CCA)methods.(1)At different stages of recovery,the Margalef richness index,Shannon-Wiener diversity index,and Pielou evenness index were all higher in undisturbed plots than in naturally recovering and damaged plots,while the Simpson dominance index was the lowest in undisturbed plots.The soil seed banks in naturally recovered and damaged plots showed the highest similarity,while the similarity between undisturbed and damaged plots was lowest.The similarity between soil seed banks and aboveground vegetation was relatively low in the three types of plots,but the similarity index was higher in naturally recovering plots than in undisturbed and damaged plots.(2)The correlation between soil seed bank density and soil factors varied with plots,but it was significantly correlated with most factors.(3)By CCA,it suggested that in naturally recovering plots environmental factors had a comparable impact on soil seed bank species distribution in descending order:Total Organic Carbon(TOC),Total Phosphorus(TP),Available Potassium(AK),and clay content.For undisturbed plots,the factors were orderly sorted by Total Kjeldahl Nitrogen(TK),TP,Ammonia Nitrogen(AN),AK,and TOC content.The ordination effect of soil seed bank distribution with soil factors was better in undisturbed plots,but it was not ideal in naturally recovering plots.This study can provide theoretical reference for prediction of evolutionary process of damaged forest communities.
万方数据
维普
