中文摘要：

利用陶瓷头土壤溶液收集器采集2006年7月～2007年8月间长白山阔叶红松天然林不同深度(15cm和60 cm)土壤溶液,探讨应用气液萃取平衡-气相色谱法测定森林土壤溶液中溶解性气体N_2O和CO_2浓度的可行性,并利用此方法研究林地不同深度土壤溶液中两种气体含量特征及其影响机理。研究结果显示观测期内林地15 cm和60 cm深度土壤溶液中溶解性CO_2浓度的变化范围分别为5.26～10.71μg·mL~(-1)(C)和3.13～6.16μg·mL~(-1)(C),溶解性N_2O浓度的变化范围分别为2.44～13.40 ng·mL~(-1)(N)和3.23～27.98 ng·mL~(-1)(N)。阔叶红松天然林土壤溶液中溶解性CO_2和N_2O浓度均呈现出明显的季节性变化。春融后的降水促进了土壤溶液中溶解性N_2O产生,尤其在60 cm深度。与60 cm深度相比,林地15 cm深度溶液中溶解性CO_2浓度的季节性变化更明显,尤其在植物生长旺季。逐步回归分析显示,水溶性有机碳含量可以解释林地不同深度溶液中溶解性CO_2浓度变化的29%;水溶性有机氮含量可以解释林地60 cm深度溶解性N_2O浓度变化的34%。因...

英文摘要：

Soil solutions at 15 cm and 60 cm depths under a Korean pine and broadleaf mixed natural forest stand at Changbai mountain,Northeast China,were sampled using porous ceramic suction cups during the period from July 2006 to August 2007,to study the dynamics of dissolved N_2O and CO_2 concentrations in solution and their key associated driving mechanisms.A combination of multiple phase equilibration procedure and gas chromatography was used for measurement of dissolved N_2O and CO_2 concentrations of solution....