酸沉降影响下庐山森林生态系统土壤溶液溶解有机碳分布

Dissolved organic carbon in soil solution of paludalfs udalfs in Mt. Lushan forest under impact of acid deposition

采用土壤溶液提取法及TOC仪测定法分析了庐山森林生态系统土壤中溶解有机碳 (DOC)的含量及其与植被因素和季节动态的关系。结果表明 ,供试土壤中DOC的含量为 2 89.85± 111.0 4mg·kg-1,其剖面分布相对平缓 ,除表层外 ,底部土壤含量也较高 ;针叶林和根圈土中表层土壤DOC含量分别高于阔叶林和非根圈土 ;土壤溶液DOC浓度的季节分异明显 ,冬、秋季偏高 ,夏、春季偏低 ;

Soil samples were collected in forest ecosystem of Mt. Lushan, China. Soil solutions were obtained by extraction method and dissolved organic carbon was determined by Total Organic Carbon Aanalizer\|5000 (Shimadzu). DOC contents and the relation to the vegetation activity and to seasonal dynamics were studied. The data of DOC lay in range of 289.85±111.04 mg·kg -1 . High concentrations could be found in bottom soil besides the peak concentration in surface soil. Surface soil DOC concentration is higher under needle\|leaf forest than under broad\|leaf one, and higher in rooted zone soil than in un\|rooted zone soil. Seasonal change of DOC concentration occurred with bigger contents in winter and spring. There was very significant positive correlation between the concentrations of DOC and of dissolved aluminum or of the ratio of monometric aluminum to polymetric aluminum.