Soil microbial community structure and diversity in Tamarix chinensis plantations in the Yellow River Delta
[Objective]The aim of this study was to explore the effects of soil microbial composition and diversity of Tamarix chinensis plantations with different stand ages,it is of great significance for evaluating the dynamic changes in soil quality and later cultivation management of artificial forests.[Method]The high-throughput sequencing technology was used to analysis the changes of bacterial and fungi community structure and diversity on no-forest land(WLD)and the plantations of different stand ages(TC3a,TC8a,TC12a)in the Yellow River Delta.[Result]The number of bacteria was more than that of fungi in three kinds of forest age and non-forest land and the dominant species did not change with the increase of forest age.Forest age had limited influence on the alpha diversity soil bacterial and fungal communities.Among them,the sequence of bacterial Chao1index,ACE index and Shannon index from high to low was TC8a,TC3a and TC12a,while the sequence of Shannon index and Simpson index of fungi from high to low was TC3a,TC 8a and TC12a.The community composition of bacteria was significantly different from that of fungi at the levels of phylum,class,order,family and genus(P＜0.05).The order of community composition of bacteria was TC12a,TC8a,TC3a and WLD at all taxonomic levels,while that of fungi was irregular,but the number of TC3a was the largest.The composition of soil microbial dominant communities and major communities was basically the same,but there were some differences in relative abundance.The relative abundance of Proteobacteria and unidentified Bacteria in the bacterial community was more than 10%,which was the absolute dominant phylum.In the fungal community,the relative abundance of Ascomycota is more than 45%,which was the dominant phylum.The change of forest age had a influence on soil physical and chemical properties and microbial community structure characteristics.The contents of soil organic carbon,total nitrogen,total phosphorus,total potassium,ammonium nitrogen,available phosphorus and available potassium increased with the increase of forest age,and were higher than WLD,while the soil salt content showed the opposite change rule.The results of redundancy analysis showed that the microbial communities of different forest age were significantly affected by nutrients,and soil total nitrogen and ammonium nitrogen in bacterial communities and total salt,organic carbon,total nitrogen and total phosphorus in fungal communities were the main environmental factors which affected the changes of bacterial and fungal communities,respectively.[Conclusion]The establishment of T.chinensis plantations effectively regulated the structure of soil microbial communities,enhanced soil microbial diversity,and improved physical and chemical properties in coastal saline-alkali lands.However,the response to forest age exhibited irregular patterns.
Yellow River DeltaTamarix chinensis plantationssoil microorganismcommunity structuresoil quality
万方数据
维普
