The Research On The Soil Organic Carbon Dynamics And Absorbing Of The Cunninghamia Lanceolata Plantation

The Cunninghamia lanceolata is a special material tree with good living hometown and growing quickly in our country south subtropics region.Currently,the areas of our country Cunninghamia lanceolata forest is 1239.1×104hm²,accounting for 26.55%of the artificial forest area and storage.The Cunninghamia lanceolata plantation is one of main forest types in southern collectivity forest region,acting as an important function in the carbon balance of the district.The main content of this research is the Cunninghamia lanceolata plantation soil organic carbon reserves carries a measurement of the soil organic carbon reserves,litters and litter decomposition and the soil breath on the Cunninghamia lanceolata plantation,to explore the reserves and the balance of the soil organic carbon.This text analyzed the Cunninghamia lanceolata plantation soil for representative subtropics climatic of shunchang,datian,putian country in Fujian province,analyzing the soil breath strength and the soil organic matter of the Cunninghamia lanceolata plantation in the different altitudes,the different depth,the different age class and the different production areas,mainly draws some conclusions so as:1.The soil organic carbon the average content in the same Cunninghamia lanceolata plantation is the lowest in summer,the spring and autumn don't greatly change,it is the tallest in winter.The soil breathes strength the most strong in summer,it is an autumn, spring secondly,the most weak in the winter.2.The content of the organic carbon in the primary regions is taller than the fringe regions. the primary regions＞the subordinate regions＞the fringe regions,the soil breath strength of the subordinate regions is taller than in the primary regions,the fringe regions＞the subordinate regions＞the primary regions.3.The age of Cunninghamia lanceolata plantation is the older,the content of the organic carbon is the higher in 0～20cm.Namely:5years＜10years＜15years＜20 years＜25years;the older the age of Cunninghamia lanceolata plantation is,the smaller releases quantity of CO₂ in 0～20cm.The breath strength of the old forest in 0～20cm is lower than young forest,but 20～40cm layer then doesn't greatly change. 4.The Cunninghamia lanceolata plantation of the same age,the higher the altitude is, the taller the content of the organic carbon is in 0～20cm,namely:300m＜600m＜900m,it doesn't greatly change in 20～40cm;the higher the altitude is,the smaller releases quantity of the CO₂ in 0～20cm.but 20～40cm layer then doesn't greatly change.