The Study On Soil Microorganism, Enzyme Activity And Nutrition Under Different Forest Vegetations

The report is focusing on four main types of vegetations: Larix kaempfera, Fargesia qinlingensis, Bashania fargesi and Pinus tabulaeformis in Shanxi Changqing National Nature Reserve in Shanxi province. We detected and analyzed the soil microorganism quantity, enzyme activity and soil nutrition contents of three soil layers(0—10 cm, 10—30cm, 30—60 cm) in stands of four forest vegetations, found their vertical change rule and distribution state under four kinds of forest vegetation, analyzed the correlation and main factors among them, and detected and analyzed nutrition elements of leaves and stems of part plants. The results are as follows:Among four kinds of forest land, soil bacteria quantity is the most, actionmyces takes second place, Cellulolytic organism is the fewest. The microorganism quantity of different forest lands are different, soil bacteria and actionmyces quantities in Fargesia qinlingensis stand are the highest, and those in Bashania fargesi land are lower than those in Larix kaempfera and Pinus tabulaeformis stands; soil fungi quantities in Fargesia qinlingensis and Bashania fargesi stands are more than Larix kaempfera and Pinus tabulaeformis stands; Azotobacter and Cellulolytic organism quantities in Fargesia qinlingensis stand are the most, the next is Larix kaempfera stand, and those in Pinus tabulaeformis stand are the fewest.Organic matter, soil N and P contents in all forest lands are high. On the overall quantity, the order of soil organic matter contents in every land from big to small is Fargesia qinlingensis, Larix kaempfera, Pinus tabulaeformis and Bashania fargesi; total N and Hydrolyzable N contents in Fargesia qinlingensis stand are the most, the next is Larix kaempfera stand, and those in Pinus tabulaeformis stand are the fewest; total P contents in Fargesia qinlingensis stand is the most, the next is Bashania fargesi stand, and those in Pinus tabulaeformis stand is the fewest; soil pH of each forest land lies between 5-6, which is weak acid.K, Na, Ca and Mg contents of each forest land soil are abundant. K content in Pinus tabulaeformis stand is the most, the next is Larix kaempfera stand, and those in Bashania fargesi stand is the fewest, in the mass the K contents of pine lands are greater than bamboo lands; Na, Ca, Mg contents in Bashania fargesi stand are the most, the next is Fargesia qinlingensis stand, and those in Pinus tabulaeformis stand are the fewest, in the mass those of pine lands are greater than those of bamboo lands.Soil protease, urease, polyphenol oxidase and catalase activities in four forest lands are high. In the mass, the order of protease and catalase activities of four forest lands from big to small is Fargesia qinlingensis, Pinus tabulaeformis, Larix kaempfera and Bashania fargesi. Soil urease activity in Fargesia qinlingensis stand is the most, the next is Larix kaempfera stand, and those in Bashania fargesi stand is the fewest,...