【摘要】：以小興安嶺天然興安落葉松沼澤濕地以及2003年、1992年、1985年開始進(jìn)行排水的興安落葉松人工林濕地為對(duì)象,研究?jī)鋈谧饔脤?duì)不同類型濕地土壤活性有機(jī)碳的影響。結(jié)果表明:4種濕地土壤有機(jī)碳(SOC)含量差異顯著(P0.05),但隨著凍融次數(shù)的增加,土壤SOC含量基本不變。經(jīng)歷1,2,4,9次凍融循環(huán)后,-5—5℃凍融處理下,其含量比凍融前僅分別變化1.64%,9.68%,2.32%,2.17%,-25—5℃凍融處理下,分別變化2.55%,6.45%,3.00%,2.36%,表明短期的凍融交替對(duì)土壤SOC總量變化的影響不大。凍融前后,4種濕地土壤輕組有機(jī)碳(LFOC)占SOC的比重變化不明顯(P0.05),但隨著凍融次數(shù)的增加,土壤LFOC含量先減少后增加,且9次凍融后略高于對(duì)照。1次凍融后,土壤DOC含量達(dá)到最大值,-5—5℃凍融處理下,分別為323.45,278.21,235.68,180.53 mg/kg,-25—5℃凍融處理下,分別為314.75,256.93,238.25,204.44 mg/kg。此外,土壤微生物量碳(MBC)占SOC比重在凍融前后變化也不明顯(P0.05),但總體上排水造林時(shí)間越長(zhǎng),土壤MBC占SOC比重變化越明顯。
[Abstract]:The effects of freezing and thawing on soil active organic carbon in different types of wetlands were studied by using natural larch swamp wetland in Xiaoxinganling and the artificial larch plantation wetland in 2003, 1992 and 1985. The results showed that there were significant differences in soil organic carbon (SOC) content among the four wetland soils (P0.05), but with the increase of freezing and thawing times, the soil SOC content was basically unchanged. After 9 freezing and thawing cycles at -5-5 鈩，

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