Abstract：The experiment was carried out during the growing season in 2009 in Sanjiang Plain, northeast of China. The soils of 0~20cm layer Carex lasiocapa marshes under different depth of standing water conditions were collected monthly for measuring the active organic carbon fractions. Seasonal dynamic of light fractions of soil organic carbon (LFOC) and microbial biomass carbon (MBC) were studied. Compared to the C. lasiocapa marsh with 10~20cm standing water, the marsh with 17~30cm standing water had higher aboveground biomass, SOC and LFOC content. As the growing season started, freeze-thawing process increased the organic carbon content of light fraction, while after that light fractions accumulated carbon slower than the heavy fractions (HF), indicating that soil characters in C. lasiocapa marsh were beneficial to the maintenance of HF. Besides, water table affected the relation between SOC and microbial activity. SOC was significantly related to MBC under 10~20cm standing water condition (R2=0.859), but under 17~30cm standing water condition the relation was not evident. Besides, the lower MBC and microbial quotient in C. lasiocapa marsh with 17~30cm standing water suggested that higher water table elevated the stability of soil carbon pool.
侯翠翠, 宋长春, 李英臣, 杨桂生. 不同水分条件沼泽湿地土壤轻组有机碳与微生物活性动态[J]. 中国环境科学, 2012, 32(1): 113-119.
HOU Cui-Cui, SONG Chang-Chun, LI Ying-Chen, YANG Gui-Sheng. Light fractions of soil organic carbon and microbial activity dynamics in marshes under different water conditions.. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(1): 113-119.
