地理科学 ›› 2013, Vol. 33 ›› Issue (3): 363-370.doi: 10.13249/j.cnki.sgs.2013.03.363

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黑河中游湿地土壤有机碳分布特征及其影响因素

赵锐锋1(), 张丽华2, 赵海莉1, 姜朋辉1, 汪建珍1   

  1. 1.西北师范大学地理与环境科学学院, 甘肃 兰州 730070
    2.中国科学院寒区旱区环境与工程研究所皋兰生态与农业综合试验站, 甘肃 兰州 730000
  • 收稿日期:2012-06-04 修回日期:2012-08-13 出版日期:2013-03-20 发布日期:2013-01-31
  • 作者简介:

    作者简介:赵锐锋(1976-),男,甘肃漳县人,博士,副教授,主要从事土地利用及资源环境变化等方面的研究。E-mail:zhaoruifeng@126.com

  • 基金资助:
    国家自然科学基金项目(41261047,41201196)、教育部博士点基金项目(20106203120004)、西北师范大学青年教师科研能力提升计划骨干项目(NWNU-LKQN-11-11)资助

Distribution of Soil Organic Carbon of Wetlands in the Middle Reaches of the Heihe River and Its Influencing Factors

Rui-feng ZHAO1(), Li-hua ZHANG2, Hai-li ZHAO1, Peng-hui JIANG1, Jian-zhen WANG1   

  1. 1. College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu 730070, China
    2. Gaolan Experiment Station for Ecology and Agriculture Research, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2012-06-04 Revised:2012-08-13 Online:2013-03-20 Published:2013-01-31

摘要:

以黑河中游湿地为研究对象,分析木本、高草、低草3种湿地植被类型土壤有机碳的分布特征及影响因素,结果表明,土壤有机碳含量的大小依次为高草>低草>木本植被类型,0~20 cm的差异均达到显著水平(p<0.05)。低草植被类型有机碳的空间变异最大,木本植被居中,高草植被最小。高草、低草和木本植被0~40 cm土壤有机碳密度分别为7.33、5.44和4.25 kg/m2。高草、低草植被以表层土壤(0~10 cm)有机碳含量更高,分别占0~40 cm的32%,31%,木本植被以亚表层(10~20 cm)最高,占33%。土壤有机碳含量与土壤含水量、磷素呈显著正相关(p<0.05),与土壤质量、pH值呈显著负相关(p<0.05)。

关键词: 有机碳, 碳密度, 湿地, 黑河, 干旱区

Abstract:

Wetland ecosystem plays an important role in global carbon budget. However, the soil organic carbon (SOC) storage of wetland has been studied poorly in arid region. The distribution of SOC and its influence factors at three types of wetland vegetation (high herb vegetation, lower herb vegetation and woody vegetation) were analyzed in the middle reaches of the Heihe River. The results showed that the SOC contents at 0-10 cm, 10-20 cm and 20-40 cm depths were in the order of high herb wetland vegetation > lower herb wetland vegetation > woody wetland vegetation. The differences in organic carbon content among the three types of wetland vegetation were significant at 0-10 cm and 10-20 cm depths of soil. The coefficient of variation of SOC was greatest in the lower herb wetland vegetation, and was least in the high herb wetland vegetation and secondary in the woody wetland vegetation. There was significant difference in SOC content between 0-10 cm and 20-40 cm depths of soil in the high herb wetland vegetation, difference was not significant in other two vegetation types. In accord with the distribution of SOC content, the soil carbon density in 0-40 cm depth was 7.33 kg/m2, 5.44 kg/m2 and 4.25 kg/m2 at high herb wetland vegetation, lower herb wetland vegetation and woody wetland vegetation, respectively. At high herb wetland vegetation and lower herb wetland vegetation, the SOC content decreased with soil depth and was more concentrated in the surface layer (0-10 cm) accounting for 32% and 31% of the total in 0-40 cm depth. While organic carbon content at the woody wetland vegetation was larger at the soil depth of 10-20 cm (accounting for 33% of the total in 0-40 cm depth). The SOC content was positively correlated with soil water content (p<0.01) and phosphorus (p<0.05), and negatively correlated with soil bulk density (p < 0.01) and pH (p<0.05). Moreover, SOC content in wetland vegetation had no obvious relationships with soil salinity and altitude. The difference in organic carbon among different soil types was not significant.

Key words: soil organic carbon, soil carbon density, wetlands, Heihe River, arid region

中图分类号: 

  • S153