Vertical Distribution Characteristics of Soil Labile Organic Carbon in Ruoergai Wetland

GAO Jun-qin; OUYANG Hua; BAI Jun-hong

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Vertical Distribution Characteristics of Soil Labile Organic Carbon in Ruoergai Wetland

更新时间：2024-11-07

- Vertical Distribution Characteristics of Soil Labile Organic Carbon in Ruoergai Wetland
- Vol. 20, Issue 1, Pages: 76-79(2006)
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  CLC： S153.6
- Published：2006
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GAO Jun-qin, OUYANG Hua, BAI Jun-hong. Vertical Distribution Characteristics of Soil Labile Organic Carbon in Ruoergai Wetland[J]. 2006, 20(1): 76-79.
DOI：

GAO Jun-qin, OUYANG Hua, BAI Jun-hong. Vertical Distribution Characteristics of Soil Labile Organic Carbon in Ruoergai Wetland[J]. 2006, 20(1): 76-79. DOI：

摘要

对若尔盖高寒湿地沼泽土和泥炭土的有机碳（TOC）和活性有机碳（LC）沿土壤剖面的分布特征研究表明，沼泽土的有机碳和全氮（TN）古量整体上从表层向下呈现下降趋势．中间在16～18cm处出现一个升高点，与当时的有机质来源和沉积环境有关。泥炭土有机碳沿土壤剖面并没有呈现同样的下降趋势．而是从表层向下至22cm呈现升高趋势，22cm向下才呈现下降趋势。全氮含量与有机碳含量的分布特征不同。在表层o～10cm古量较高，向下含量减小。沼泽土活性有机碳沿土壤剖面整体呈现下降趋势，变化于2．4～13．6mg／g．变异系数较大。达到53．25％。泥炭土活性有机碳沿土壤剖面规律性不明显，变化于30-45mg／g，变异系数只有11．62％。沼泽土的活性有机碳占到总有机碳的3％～17％。变化较大；而泥炭土的活性有机碳占到总有机碳的7％～12％，变化较小。沼泽土和泥炭土的有机碳活度（L）最大值并不是出现在表层，而是在表层稍微向下的部分（8～10cm）。再向下有机碳活度呈现下降的趋势。

Abstract

The distribution of organic carbon and labile organic carbon along soil profile in swamp soil and peat soil in Ruoergai alpine wetland were studied.The results showed that the contents of SOC and TN in swamp soil had a descending trend along soil profile but increased at 16~18 cm which was related with the source of SOM and the sediment environment at that time.The contents of SOC in peat soil did not show the same descending trend along soil profile but showed an ascending trend from surface layer to 22 cm and descending trend from 22 cm to 30 cm.The distribution characteristics of TN in peat soil were different from that of SOC.The contents of TN in peat soil were high at 0~10 cm and decreased downwards.The contents of LC in swamp soil had a descending trend along soil profile and changed from 13.6 mg/g to 2.4 mg/g;hence the vertical distribution variance index was 53.25%.The contents of LC in peat soil did not show obvious change trend and changed from 30 mg/g to 45 mg/g;hence the vertical distribution variance index was 11.62%.LC was 3%~17% of SOM in swamp soil and 7%~12% in peat soil.The maximum of L in swamp soil and peat soil was not at surface layer but below surface(8~10 cm).

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