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赵光影,郭冬楠,江姗.冻融作用对小兴安岭典型湿地土壤活性有机碳的影响.生态学报,2017,(16).http://dx.doi.org/10.5846/stxb201605170953  
冻融作用对小兴安岭典型湿地土壤活性有机碳的影响
Effect of Freezing and Thawing on Soil active organic carbon in Xiaoxing'' an Mountains Wetland
投稿时间:2016-05-17  最后修改时间:2017-03-22
DOI: 10.5846/stxb201605170953
关键词冻融循环  小兴安岭湿地  排水造林  有机碳
Key Wordsfreeze-thaw cycle  Xiaoxing'' an Mountains wetland  drainage afforestation  soil organic carbon
基金项目国家自然基金项目(41301082,4157012165);黑龙江省博士后资助项目(LRB13⁃200)
作者单位E-mail
赵光影 哈尔滨师范大学 dlzgy2009@126.com 
郭冬楠 哈尔滨师范大学  
江姗 哈尔滨师范大学  
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摘要:
以小兴安岭天然兴安落叶松沼泽湿地以及2003年、1992年、1985年开始进行排水的兴安落叶松人工林湿地为对象,研究冻融作用对不同类型湿地土壤活性有机碳的影响。结果表明:四种湿地土壤SOC含量差异显著(P<0.05),但随着冻融次数的增加,土壤SOC含量基本不变。经历1,2,4,9次冻融循环后,-5~5 ℃冻融处理下,其含量比冻融前仅变化为1.64%,9.68%,2.32%,2.17%,12.87%,-25~5 ℃冻融处理下,分别为2.55%,6.45%,3.00%,2.36%,2.41%,表明短期的冻融交替对土壤SOC总量变化的影响不大。冻融前后,四种湿地土壤LFOC占SOC的比重变化不明显(P>0.05),但随着冻融次数的增加,土壤LFOC含量先减少后增加,且9次冻融后略高于对照。1次冻融后,土壤DOC含量达到最大值,-5~5 ℃冻融处理下,分别为323.45,278.21,235.68,180.53 mg/kg,-25~5 ℃冻融处理下,分别为314.75,256.93,238.25,204.44 mg/kg。此外,土壤MBC占SOC比重在冻融前后变化也不明显(P>0.05),但总体上排水造林时间越长,土壤MBC占SOC比重变化越明显。
Abstract:
Taking the soil of natural larix gmelini sedge wetland in Xiaoxing'' an Mountains and larix gmelini wetland after drainage afforestation in 2003, 1992, and 1985 , the effect of freezing and thawing on soil active organic carbon were investigated. Results indicated that there were significant difference in four kinds of wetland SOC content (P < 0.05), but with the increase of freezing and thawing, soil SOC content was basically unchanged. After 1,2,4,9 times freeze-thaw cycle, the SOC content change was 1.64%, 9.68%, 2.32%, 2.17%, 12.87% under -5 ~ 5 ℃ freeze-thaw treatment,and their average content respectively were 2.55%, 6.45%, 3.00%, 2.36%, 2.41% under -25 ~ 5 ℃ freeze-thaw treatment which indicated that the effect of freeze-thaw action on SOC in soil was not obvious in short period. Before and after freezing and thawing, the change of LFOC/SOC in four kinds of wetland soil is not obvious (P>0.05), but with the increase of number of freezing and thawing , LFOC content declinedat first and then rose ,and the content was slightly higher than control group after nine times freeze-thaw ,DOC peaked after one freeze-thaw cycle, and the DOC content respectively is 323.45 , 278.21, 235.68, 180.53 mg/kg under -5~5 ℃ freeze-thaw treatment ,they are respectively 314.75, 256.93, 238.25, 204.44 mg/kg -25~5 ℃ freeze-thaw treatment .In addition, the MBC/SOC change in soil is not obvious before and after freezing and thawing (P > 0.05), but on the whole, with the increasing of drainage afforestation time, the difference of MBC/SOC was more obvious.
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