生态环境学报Issue(11)：1769-1775,7.
冻融作用下寒温带针叶林土壤碳氮矿化过程研究
Soil Carbon and Nitrogen Mineralization in A Larix gmelinii Forest during Freeze-thaw Cycles
摘要
Abstract
To investigate the mineralization of soil carbon (C) and nitrogen (N) of cold-temperate coniferous forest soil and their relationships during freeze-thaw cycles, we collected Larix gmelinii forest soil in the Daxinganling region and conducted a 30d laboratory incubation experiment with two treatments of control (constant 8 ℃) and freeze-thaw (each cycle:-5 ℃ in 24 h and then 8 ℃ in 24 h). Our results showed that incubation temperature and time had significant effects on soil C mineralization rates and C mineralization accumulated. After the 1st and 5th freeze-thaw cycles the soil C mineralization rates were higher in the freeze-thaw treatment than in the control. The amounts of C mineralization accumulated in the freeze-thaw treatment were lower than those in the control after the 7th and 15th freeze-thaw cycles. Incubation temperature and time had no effect on soil N mineralization rates while the N mineralization accumulated was significantly affected by both two factors. After the 5th, 7th, and 15th freeze-thaw cycles the amounts of net N mineralization accumulated were higher in the control than in the freeze-thaw treatment. After 30d incubation the amounts of C and N mineralization accumulated were 1.42 and 2.21 times higher respectively in the control (C accumulated:92.82μg·g-1, N accumulated 73.76 mg·kg-1) as against the freeze-thaw treatment (C accumulated:65.51 μg·g-1, N accumulated 33.45 mg·kg-1). Net N mineralization accumulated was positively correlated with C mineralization accumulated in both control and freeze-thaw treatments. But with the same carbon emission, N mineralization accumulated was less in the freeze-thaw treatment compared with control. Consequently, freeze-thaw cycles can decrease C emission and inorganic N accumulation of the cold-temperate coniferous forest soil in the Daxinganling region, which might improve soil C storage and decrease nutrient loss.关键词
北方森林/冻融循环/土壤碳释放/铵态氮/硝态氮/微生物生物量Key words
boreal forest/freeze-thaw cycles/soil carbon emission/NH4+/NO3-/microbial biomsss分类
农业科技引用本文复制引用
罗亚晨,吕瑜良,杨浩,何念鹏,李胜功,高文龙..冻融作用下寒温带针叶林土壤碳氮矿化过程研究[J].生态环境学报,2014,(11):1769-1775,7.基金项目
国家自然科学基金项目 （）
