Study On Soil Enzyme Activity And Soil Microorganisms In Different Transformation Pattern Of The Cypress Inefficient

Soil microbial is the important participants of forest ecological restoration and reconstruction, it is also one of important index of the process of reconstruction.The research of soil microbial succession law in the process of forest ecological system recovery and the important factors of the rule is significant for guiding the ecological restoration. The soil enzyme activity is not only the important biological characterization of soil fertility index and closely related with biological elements cycling, also it is one of the essential monitoring index in the process of ecological system.The cycling and balance of nutrient directly impacts on the level of the ecosystem productivity, distribution and metabolism in plant decide the growth process and productivity of plant. In the process of the circle of nature, it makes an important contribution for the variation.This study discusses the influence of the soil enzyme activity and soil microorganisms and the soil nutrient in several typical transformation pattern of cypress inefficient (cypress+bamboo+alder、pure bamboo、cypress+bamboo、cypress+oak、pure cypress、 oak+bamboo) in De yang city, The results were mainly as follows:(1) Soil microbial counts in several typical transformation pattern of cedar inefficient showed the ranked order of bacteria> actinomycetes> fungi.The number of total number of microbial bacteria is75%～95%, The number of total number of microbial actinomycetes is5%～20%, The number of total number of microbial fungi is0.4%～1.2%. Among them,the total number of soil microbial was found with maximum in pure bamboo, followed by cypress+bamboo+alder, minimum in oak+bamboo.(2) The total quantity of soil bacteria, fungi, actinomyces, and microbial changed significantly in different soil layer, in six kinds of reform mode. The amount increased linearly with soil depth decreased. Season rule of all kinds of group of microorganism quantity was not consistent in soil, The quantity of bacteria and actinomyces was obviously the highest in summer, change of fungi quantity was without obvious seasonal law,but the major peak appeared in the spring and summer season.(3) Soil enzyme activities of the six modes were very distinct in different soil layers (soil phosphatase, catalase, invertase and urease). The activities of soil enzyme were higher in the0～10cm soil layer than that in the10～20cm soil layer, But the upper and lower of catalase was no significant difference.Soil enzyme activities of different modes were not very distinct in different seasons. The activity of soil phosphatase, invertase and urease was the highest for the summer, That of catalase was the highest for the autumn. Invertase and urease activity was found with maximum in mode cypress+bamboo+alder, acid phosphatase activities for mode cypress+oak, catalase activity for pure bamboo.(4) Soil nutrient content was very distinct in different soil layers (total nitrogen、 nitrogen hydrolysis、total phosphorus、effective phosphorus、total potassium、 rapidly-available potassium and organic matter). The content of soil nutrient was higher in the0～10cm soil layer than that in the10～20cm soil layer. Among them, there wrere little differences between the upper and the lower for the soil total potassium and total phosphorus.Then there were large differences between the upper and the lower for mode cypress+bamboo+alder、oak+bamboo、cypress+oak and mode cypress+bamboo.Soil nutrient content of different modes was very distinct in different seasons.The content of soil total nitrogen, total phosphorus, total potassium and organic matter was found with maximum in autumn; the content of soil nitrogen hydrolysis, phosphorus efficient and rapidly-available potassium was found with maximum in summer.In the six modes, the content of total nitrogen, hydrolysis nitrogen, phosphorus efficient, total potassium and organic matter were showed the highest in mode cypress+bamboo+alder, the content of total phosphorus demonstrated the highest in mode pure bamboo, the content of rapidly-available potassium demonstrated the highest in mode oak+bamboo.(5) There are definite correlations among soil microbial, soil enzymes and soil nutrients. Among them, fungi was significant positive correlated with catalase(p<0.05), and a very significant positive correlation was found among fungi with total nitrogen, hydrolysable nitrogen, total potassium and available potassium(p<0.01); Actinomycetes had a significant positive correlation with hydrolysable nitrogen and total potassium(p<0.05), and was very significant positive correlated with urease, catalase, invertase and total phosphorus (p<0.01); Bacteria was significant positive correlatied with hydrolysable nitrogen,total potassium and organic matter(p<0.05),and the correlations among bacteria and urease, catalase, invertase and total nitrogen reached very significant level(p<0.01).Urease was significant positive related with total nitrogen, hydrolysable nitrogen and total potassium (p<0.05);the relation between catalase and total nitaogen and total potassium was into very significant positive correlation(p<0.05), and catalase was very significant positive correlated with hydrolysable nitrogen and organic matter(p<0.01); phosphatase had a very significant positive correlation with organic matter(p<0.05) and was significant positive correlated with total nitrogen and total potassium(p<0.01);sucrase was significant positive correlated with hydrolysable nitrogen,total phosphorus and total potassium(p<0.05).(6) The analysis of principal component was carried out based on six transformation models. Then comprehensive evaluation of soil fertility came to a conclusion that: cypress+bamboo+alder> pure bamboo> cypress+bamboo> cypress+oak> pure cypress> oak+bamboo. It is clear that soil fertility is significantly improved after cypress inefficient forest transformation in Deyang Jinyang District.