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中文摘要：
利用土柱模拟实验，研究冻融和枯落物对土壤淋溶液的影响．结果表明，冻融提高了土壤淋溶液中TN，NH4^＋-N，TP,PO4^3-的浓度和流失量，而降低了DOC，N03-N浓度和流失量在31d淋溶实验中，枯落物干重残留率为91．81％，C、N、P的残留率分别为81．96％，65．22％和88.89％；枯落物显著提高淋溶液中的C、N、P的含量和流失量（NH4^＋-N除外），说明枯落物是生态系统重要的营养库；枯落物的C、N、P释放量远远高于淋溶液的C、N、P流失量，表明湿地土壤是枯落物释放出C、N、P的重要汇．
英文摘要：
Soil columns leaching experiment was used to investigate the dynamics of leaching loss of nutrients in wetland soil affected by freeze-thaw and litter in Sanjiang Plain, Northern China. The soil was the source of nutrients, freeze-thaw significantly increased the content and amount of TN, NH4＋-N, TP, PO43 in the leachate, but decreased the content and loss amount of DOC and NO3 -N. During the 31-day leaching experiment, the residual dry mass of litter was 91.81%, and the residual mass C, N and P were 81.96%, 65.22% and 88.89% respectively. The litter significantly increased the content and loss amount of C, N and P in leachate （expect NHa＋-N）, indicating that litter was an important nutrients source in wetland ecosystems. Meanwhile, the released amounts of C, N and P from litter were higher than the amount of C, N and P in leachate, suggesting that the soil was a nutrient sink for nutrients released from the liter.
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