Study On Characteristics Of Soil Respiration In A Jujube Trees Plantation

Global warming is the catalyst of the carbon cycle research in community. It is awareness that the knowledge of carbon cycle as an important part of the soil respiration study. It can provide the basis reasons for accurate estimates of global carbon cycle that strengthening all areas of ecosystem dynamics of soil respiration and affecting factors. In this experiment, the jujube tree plantation near the Jinci Park as plots (originally for rice cultivation), and during 2005-2010, the jujube tree plantation was studied for soil respiration rate, soil temperature, soil sampling and laboratory analysis of soil water, and the aim was to study the kind of jujube tree plantation soil respiration rate and the annual seasonal dynamics, and use some of the classic models to analysis the relationship among soil respiration, soil temperature, soil respiration rate and soil moisture. Key findings include:(1) Soil respiration rate of Jujube tree plantation showed significant seasonal variation and appeared a single peak curve. Gaussian equation that determined the date on changes in soil respiration rate reached a significant level, however, the internal variation of soil respiration rate was not significant. At the same time,5cm,10cm, and 15cm depth soil temperature also showed a single peak, and seasonal changes in the winter and early spring temperature was lower, meanwhile, the higher the temperature in the summer, with the atmospheric temperature changes, and in the measurement period, the Gaussian equation that expressed different depth of soil temperature changes with the date reached a significant level; soil moisture was no apparent regularity. Among the water content in the 15.34-37.01%, and the majority was more than 20%, water content in soil was lower, showing fluctuations and volatility. In the measurement period, internal variation of different depths of soil temperature and soil moisture was not significant.(2) During the year of 2005-2007, at different depths of soil respiration rate and soil thermometer emerged significantly associated linear model and exponential model, but generally speaking, linear correlation model was better than the exponential model. However, soil respiration rate during 2008-2010, with the exception of 5cm,10cm depth of 2008 and 10cm,15cm depth of soil temperature of 2010, to some extent related, the rest is not relevant.(3) Based on soil temperature R10 at different depths among the value obtained in the 1.8945-5.1119, Q10 among the value obtained in the 1.029-1.0757 during 2005-2010.(4) Soil respiration and soil moisture showed some correlation except the year of 2005 and 2006, and the remaining average is not significantly. It determined that soil moisture and soil respiration influenced the changes in the year of 2005 and 2006. Standardized to the same temperature, soil moisture, soil respiration rate and soil moisture associated have significantly improved. However the year of 2005,2006 and 2010, soil respiration and soil moisture correlation reached a significant level.