摘要
选择吉林西部前郭县盐碱水田土壤,进行实验室模拟冻融实验：以-5℃冻结1 d、5℃消融1 d作为1次冻融循环,揭示不同含水率和含氮量处理条件下土壤有机碳（SOC）的变化规律。结果表明,土壤含水率和含氮量是影响SOC含量的2个重要因素,冻融次数、土壤含水率、土壤含氮量以及冻融次数和土壤含水率、冻融次数和土壤含氮量的交互作用对盐碱水田SOC含量的影响显著（P〈0.05）。在1~3次冻融循环过程中,SOC含量明显降低,随着循环次数的增加,SOC含量降低速度减缓;适量的氮素和较低的含水率有利于SOC的稳定,初始含水率为50%的SOC含量明显低于含水率30%和40%的土壤,加入20%硝酸铵的SOC含量明显低于对照组和加入10%硝酸铵的土壤。研究结果对深入研究季节冻土区冻融期盐碱水田SOC变化规律,评估全年候SOC储量有重要意义。
Based on saline-alkali paddy soils in Qianguo county that is located in Western Jilin Province,the indoor simulating experiments were carried out.A freeze-thaw cycle（FTC） includes one day freezing at-5 ℃ and one day thawing at 5 ℃ in order to monitor the changes of soil organic carbon（SOC） under different conditions of moisture and nitrogen content.The results show that soil moisture and nitrogen content are two important factors that affect the SOC content,and the SOC content of saline-alkali paddy field is significant affected（P 0.05） by freeze-thaw frequency,soil moisture,nitrogen content,the interaction of freeze-thaw frequency and soil moisture and the interaction of freeze-thaw frequency and nitrogen content.The SOC content reduced obviously from the first to the third freeze-thaw cycles,and reduced slower with the increasing of the number of cycles.In the freeze-thaw process,an appropriate amount of nitrogen and low moisture contribute to the stability of SOC.The SOC content in the soil with initial moisture content of 50% is significantly lower than that of 30% and 40%.The SOC content of the group in which 20% ammonium nitrate is added is much lower than that in the control group with 10% ammonium nitrate added.The results are important to reveal the changes of SOC in the saline-alkali paddy soils during freeze-thaw period and assess the annual storage of SOC in seasonal frozen soil areas.
出处
《生态环境学报》
CSCD
北大核心
2012年第4期620-623,共4页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(40871088
51179073)
高等学校博士学科点专项科研基金项目(20090061110057)
关键词
季节性冻融
土壤有机碳
含水率
氮素
盐碱水田区
吉林西部
seasonal freeze-thaw
soil organic carbon
moisture content
nitrogen
saline-alkali paddy field
western Jilin province
