Dynamics of soil micro-ecological environment at different growth stages of poplar plantation were studied in Zhaoxian town and Qiaoshan town of Ju county

Shandong province.The results showed: with the plantation ages increased

soil physics property became worse

and then it became better than before.However

pH value decreased with plantation ages increased.Contents of soil nutrients and the activity of soil urease increased firstly

and then decreased.Peroxidase activity and polyphenol oxidase activity decreased with plantation ages increased;however

catalase activity was not a significant law.With the poplar plantation ages increased

the number of bacteria and actinomyces and total number of soil microbes increased;however

the number of fungi was not a significant law.Compared with different soil layers

soil physical properties of the bottom layer were worse than the top layer.With the depth of soil layer increased

the contents of soil nutrients were decreased other than soil available P and soil micro-element Fe.The activity of soil urease was decreased with the depth of soil layer increased;however

catalase activity

peroxidase activity and polyphenol oxidase activity were not significant law.Especially

compared with the two experimental sites

catalase activity showed reverse trends.