The Microbial Diversity Difference In The Carya Cathayensis Forest Soil Under Different Management Models

To optimize the management models of the Carya cathayensis forest through the diversity and function of soil microorganism,the disease indexes,soil p H,nutrient and soil microbial diversity were investigated under ecological management and excessive management during Botryosphaeria dothidea infected period by using 16 Sr RNA gene and ITS high-throughput sequencing.The correlations between each interrelationship factors were also analyzed.The results showed that:1.The disease index of ecological management forest was 3.3,which was significantly lower than that of excessive management forest with 81.9.2.The soil p H value of ecological management forest was near neutral with reading of 6.64,which was significantly higher than that of excessive management forest soil.3.The contents of available phosphorus,available potassium and available nitrogen in excessive management forest soil were 18.10 mg/kg,698.63 mg/kg and 227.13 mg/kg respectively,which were significantly higher than those in ecological management forest respectively.4.There were 14 and 21 major bacterial genera,8 and 27 major fungal genera in ecological and excessive management forest soil samples respectively.In ecological management forest soil,the dominant bacterial genera were Sphingomonas,Gaiella and Lysobacter,with relative abundance of 2.29%,0.61% and 0.57% respectively.Whereas the dominant fungal genera were Tomentella,Xerocomellus and Amanita,with relative abundance of 3.06%,0.76% and 0.10% respectively.All of the above were significantly higher than relative abundance of those dominant microbial genera in excessive management forest soil.In excessive management forest soil,the dominant bacterial genera were Bryobacter,Candidatus Solibacter and Bradyrhizobium,with relative abundance of 1.03%,1.40% and 0.95% respectively.Whereas the dominant fungal genera were Inocybe,Sebacina,Hymenogaster,Clavulina,Russula and Tuber,with relative abundance of 27.12%,14.02%,6.95%,6.46%,4.51% and 3.93% respectively.All of the above were significantly higher than relative abundance of those dominant microbial genera in ecological management forest soil.5.Both hickory forest soil of two management models all had a high bacterial and fungal species abundance and diversity.The fungal indices of Ace,Chao,Shannon and Simpson in excessive management forest soil were 451,441,4.11 and 0.905 respectively,which were significantly higher than those four indices in ecological management forest soil respectively.6.PH value,available phosphorous and available nitrogen had significant influences on the community structure of dominant bacterial genera,and p H value,available potassium and available nitrogen were significant influence factors of the community structure of dominant fungal genera.Our results can provide valuable references for the sustainable management of hickory forest.