Effects Of Long-term Fertilization On The Change Law Of The Microbial Biomass C,N And Soil Enzyme Activity In Cinnamon Soil

Cinnamon soil is the main one of soil types in partial drought region of China's semi-arid and sub-humid areas.Cinnamon soil is 2.861 million hectares in the main fanning soil of Shanxi Province,which is an important production base for foodstuff,vegetables,fruits,meat,egg,milk and other agricultural and sideline products in Shanxi Province.As the shortcomings of natural environment and agricultural operations as well as the large area of low fertility in arable land,we can not play the greatest production potential of Cinnamon soil.Soil microbial activity and soil enzyme activity are the key factor of soil organic matter transformation and nutrients transformation, while they have a rapid change by factors such as the impact of fertilizing. Soil microbial activity and Soil enzyme activity often were used to evaluate biological characteristics of soil quality.Through studying long-term fertilization effects on evolution of biological characteristics of Cinnamon soil quality,we can explore and nail down the effective ways and key measures to maintaining and enhancing biological characteristics of Cinnamon soil quality in order to promote the sustainable development of agriculture.During corn's growing period,the soil of two long-term experimental fields(0～20cm and 20～40cm) located in national dry farming trial area was detected and analyzed in Shouyang county,Shanxi province.We have a discussion on evolution of biological characteristics of Cinnamon soil quality by applying long-term fertilization in different corn's growing periods and the changes of cinnamon soil microbial biomass carbon,microbial biomass nitrogen and soil enzyme activity in different levels,else,We have a correlation analysis among microbial biomass,soil enzyme activity,soil physical and chemical factors and soil productivity.The results were as follows:Through long-term fertilization,the evolution of microbial biomass carbon,microbial biomass nitrogen and enzyme activity in the tillage layer(0～20cm) of cinnamon soil is approached at preplanting,small bell stage and post-harvest,respectively.MBC:In the surface layer,the trend increased first and then decreased is for no fertilizer and the middle amount application of single inorganic fertilizer.The same trend is high amount application of single inorganic fertilizer,high amount of inorganic fertilizer combined with organic manure, high amount of organic manure and returning corn stalks(cattle dung) to the field combined with applying fertilizer in autumn.MBN:In the surface,the trend increased first and then decreased is for low amount and high amount application of single inorganic fertilizer,stalks mulching treatment combined with applying fertilizer in spring,returning corn stalks(cattle dung) to the field combined with applying fertilizer in autumn,stalks directly returning to field combined with applying fertilizer in autumn and only applying inorganic fertilizer in autumn.Urease:In the long-term trial of inorganic fertilizer combined with organic manure,the trend increased first and then decreased is for all treatments in the surface layer.In the long-term different fertilization and fertility betterment trial,only stalks mulching treatment combined with applying fertilizer in spring have the same trend.ALP:In the surface layer,the trend increased first and then decreased is nothing treatments.Effects of long-term fertilization on microbial biomass C,N and enzyme activity in different layers of cinnamon soil for all treatments.MBC and MBN in cinnamon soil could both increased through applying high amount of organic fertilizer,inorganic fertilizer combined with organic manure in a right way.With the increasing of applying organic fertilizer,the amount of MBC and MBN was increased significantly.By applying inorganic fertilizer in different dosage,the amount of MBC and MBN was not increased significantly.The amount of MBC,MBN in cinnamon soil both decreased when from 0～20cm layer to 20～40cm layer.Urease and Alkaline phosphatase activity in cinnamon soil could increase by a long-term of application with inorganic fertilizer or inorganic fertilizer combined with organic manure in a right way.Urease and Alkaline phosphatase activity in cinnamon soil were increased significantly by applying high amount of organic fertilizer.The activity of Urease and Alkaline phosphatase in cinnamon soil both decreased when from 0～20cm layer to 20～40cm layer, too.The amount of MBC and MBN in cinnamon soil could increase through long-term returning corn stalks to the field combined with applying fertilizer in autumn and long-term returning corn stalks to the field combined with applying fertilizer in spring.At the depth of 0～20cm tillage layer,the amount of MBC in cinnamon soil could increase by applying fertilizer in spring,and the amount of MBN in cinnamon soil could increase and decrease by applying fertilizer in autumn.The amount of microbial biomass C,N in cinnamon soil for different treatments at the depth of 20～40cm have a different change with different treatments at the depth of 20～40cm.At the depth of 0～20cm,Urease and Alkaline phosphatase activity in cinnamon soil could increase through long-term returning corn stalks to the field combined with applying fertilizer in autumn and long-term returning corn stalks to the field combined with applying fertilizer in spring.At the depth of 20～40 cm, Urease activity in cinnamon soil could increase through returning corn stalks to the field combined with applying fertilizer in autumn,and Urease activity in cinnamon soil could decrease through returning corn stalks to the field combined with applying fertilizer in spring.Alkaline phosphatase could only decrease through stalks directly returning to field combined with applying fertilizer in spring.The positive or apparent positive correlation was found between grain yield and the four ldnds of soil quality indicators—MBC,MBN,Urease enzyme and Alkaline phosphatase in cinnamon soil,which was also found between soil nutrients content and them.The apparent positive correlation was found between MBC and MBN,which was also found between MBC and alkaline phosphatase.The positive correlation was found between MBC and urease activitiy.The apparent positive correlation was found between microbial biomass N and activities of urease and alkaline phosphatase.