Studies On The Dynamic Relationship Between The Soil Respiration Of Forest Ecosystems And Several Meteorological Factors

Forest ecosystems are important components of terrestrial ecosystems. Comparing with other vegetation types, land forest vegetations, having the wide distribution area and the largest biomass accumulation, play an important role in the carbon cycles of terrestrial ecosystems. Carbon storages of forest vegetation, whose average density of carbon storages are higher than that of farmland and grassland ecosystems, take most part of carbon storages of terrestrial ecosystems. Soil respirations of forest ecosystems are important process of forest ecosystems releasing CO₂ from soil carbon pool into atmosphere, which are important components of the carbon cycle of Forest ecosystems. This paper obtained the following conclusions by studied the dynamic relations between soil respiration of different woodland types and several environmental factors.(1) There are some obvious daily changes of soil respiration between coniferous forest, broadleaf forest and mixed stand of Dabie Mountain, whose character is a curve of single-peak type, with the consistent trend of soil temperature changes. Generally, soil respiration rate is the lowest in the morning, then, with the temperature rising, soil respiration rates rise gradually, and after reaching the highest value, then declining gradually.(2) Different forest ecosystems soil respiration exist seasonal changes. The soil respiration rate of Dabie Mountain three forest ecosystems reach the highest value in the autumn and the lowest value in the winter. The soil respiration rate of Dashu Mountain mixed stand ecosystems reach the highest value in the summer and the lowest value in the winter.(3) Interrelationships between the soil respiration of different woodland types and temperature were obtained by regression analysis, building regression equation between soil respiration and temperatures at different heights. Through analysis of the correlation know it exists a better correlation relations between soil respiration and temperatures at various heights. Correlation coefficient is 0.527—0.538(**)(p<0.01)between of Dabie Mountain coniferous forest soil respiration; 0.533—0.542(**)( p<0.01 ) between temperature and Broadleaf forest soil respiration; 0.776—0.782(**)(p<0.01) between mixed stand soil respiration and Temperature. It says between soil respiration and Temperature of different woodland types exist conspicuous interrelationship Relations.(4) Through regression analysis can get the regression equation between soil respiration of different woodland types and soil temperature of different levels, using correlation analysis gets correlation coefficient between soil respiration of different woodland types and Soil temperature of different levels. The result shows: the correlation between Dabie Mountain coniferous forest, Broadleaf forest and soil respiration of Mixed stand is better, the best correlation is between Dashu Mountain mixed stand soil respiration and soil temperature Underground 5cm. Correlation coefficient is 0.779(**)(p<0.01).(5) Through regression analysis of the observational data and Related analysis can reach that soil respiration of different woodland types and soil organic matter in 0-5cm ,5-10cm soil exist Very significant interrelationship, correlation coefficient is over 0.823(**)(p<0.01).Known from this , soil organic matter to Different types of woodland soil respiration impact is more remarkable.(6) Known through regression analysis and correlation analysis between soil respiration of different woodland types and atmospheric environment and soil environment, among four types of woodland soil respiration and atmospheric temperature,shallow soil temperature and soil organic matter have more correlation. Correlation coefficient Respectively is: Dashu Mountain mixed stand 0.781(**),0.779(**) and 0.887(**); Dabie Mountain coniferous forest 0.538(**),0.550(**) and 0.978(**);Dabie Mountain broadleaf forest 0.517(**),0.503(**) and 0.925(*); Dabie Mountain mixed stand 0.542(**),0.561(**) and 0.964(*).