Effects Of Management Models On Abundanceand Structure Of Soil Bacterial And Fungal Community In Mao Bamboo (Phyllostachys Edulis) Forest

Moso bamboo(Phyllostachys heterocycla)is an important plantation in the subtropical region of China.At present,extensive and intensive management are the two main management model for moso bamboo in China.The extensive management of moso bamboo has a significant impact on soil nutrient cycling and microbial community structure.Soil samples(0-20 and 20-40 cm)under bamboo planation with 5 gradient cultivation history in extensive and intensive management moso bamboo forests were collected for analysis soil chemical properties and bacterial and fungal community by PCR-DGGE and T-RFLP methods.The objective was to find out the characteristics and evolution of bacteria and fungi in moso bamboo stand soils.The main results obtained were as follows:(1)The abundance of soil bacteria in Anji decreased in the history of extensive management.The abundance of Anji Fungi were highest in 5th year.The trend of abundance in different area was differernt.Soil bacteria structure exhibited a higher sensible response to disturbance by bamboo cultivation compared with fungal,but bacteria structure of subsoil in both sides display an ability of eventual resiliency.Redundancy analysis(RDA)of soil properties and bacteria and fungi species based on DGGE bands information showed that the first two axes explained less than 65%of environmental variables in most of the sampling sites and soil layers,which indicated that the complex soil parameters rather than the analyzed 5 ones to drive the soil community alteration.There was no accordant significant factor(positive or negative)to drive alteration of soil microbial communities in the sampling sites and layers,which indicated multi parameters rather than one or two factors did.(2)Soil nutrients are enriched in the history of intensive management.There are regional differences in abundance of bacteria and fungi.There was no significant difference in abundance of bacteria and fungi in samples of different operating hours.Changes of bacterial diversity occur in the late stages of operation,and changes of fungi diversity occur in the early stages of operation.Community structure of soil bacteria and fungi in the intensive management of bamboo forest development process changes,but bacteria show a tendency which can return to the initial structure,and the difference in community structure of fungi will increase with time.The physical and chemical properties which affect the same area of bacteria and fungi structure are uniform,and p H plays a key role in the process of bacterial and fungal community changing.