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中国沙漠 ›› 2025, Vol. 45 ›› Issue (4): 357-367.DOI: 10.7522/j.issn.1000-694X.2025.00079

• • 上一篇    

沙质草地3种植物群落土壤有机碳氮密度特征

武雅琳1,2,4(), 赵学勇1,2,3, 张蕊1,2,3,4()   

  1. 1.中国科学院西北生态环境资源研究院,干旱区生态安全与可持续发展全国重点实验室,甘肃 兰州 730000
    2.中国科学院西北生态环境资源研究院,奈曼沙漠化研究站,甘肃 兰州 730000
    3.中国科学院西北生态环境资源研究院,乌拉特荒漠草原研究站,甘肃 兰州 730000
    4.中国科学院大学,北京 100049
  • 收稿日期:2025-05-11 修回日期:2025-07-01 出版日期:2025-07-20 发布日期:2025-08-18
  • 通讯作者: 张蕊
  • 作者简介:武雅琳(2002—),女,河北石家庄人,硕士研究生,主要从事土壤生态学研究。E-mail: wuyalin24@mails.ucas.ac.cn
  • 基金资助:
    国家自然科学基金项目(42207538)

Characteristics of soil organic carbon and nitrogen density in three plant communities of sandy grasslands

Yalin Wu1,2,4(), Xueyong Zhao1,2,3, Rui Zhang1,2,3,4()   

  1. 1.State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands /, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.Naiman Desertification Research Station /, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.Urat Desert-Grassland Research Station, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    4.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2025-05-11 Revised:2025-07-01 Online:2025-07-20 Published:2025-08-18
  • Contact: Rui Zhang

摘要:

土壤有机碳和全氮是土壤系统功能实现的核心要素,探讨植物群落对土壤有机碳和全氮的影响有利于深入理解科尔沁沙地土壤碳氮密度的变化规律。本研究以科尔沁沙地黄蒿+禾本科(Artemisia scoparia+Gramineae,ASP)、小叶锦鸡儿+杂类草(Caragana microphylla+Forbs,CMF)、沙米+狗尾草(Agriophyllum squarrosum+Setaria viridis,ASGB)为主的3种植物群落为研究对象,分析不同植物群落的土壤碳氮密度特征及其影响因素。结果表明:(1)0~100 cm土壤有机碳(SOC)、全氮(TN)、全磷(TP)依次为ASP群落>CMF群落>ASGB群落。SOC、TN随土壤深度的增加而减少,TP、TK在各土层深度均保持稳定。(2)ASP群落土壤C∶P、C∶K、N∶P、N∶K、P∶K值最大,ASGB群落20~40 cm土壤C∶N显著高于ASP群落。土壤C∶P、C∶K、N∶K、P∶K随土层深度的增加呈下降趋势。(3)0~10、10~20、20~40 cm土壤有机碳密度(SCD)和土壤氮密度(SND)依次为ASP群落>CMF群落>ASGB群落。3种植物群落SCD随土壤深度的增加先降低后升高,而ASP群落SND表现出相反趋势。(4)土壤C∶N和黏粒对SCD影响的贡献率分别为15.5%和11.7%;土壤N∶P、N∶K和黏粒对SND影响的贡献率分别为23.7%、22.3%和8.4%。

关键词: 科尔沁沙地, 土壤养分, 化学计量, 土壤氮密度, 有机碳密度

Abstract:

Soil organic carbon (SOC) and nitrogen (N) are core elements for the functioning of soil systems. Investigating the effects of different plant communities and soil depths on SOC and total nitrogen (TN) is essential for understanding the variation patterns of soil carbon and nitrogen density in the Horqin Sandy Land. This study chose three plant communities in the Horqin Sandy Land: dominant species of Artemisia scoparia + Gramineae (ASP), Caragana microphylla + Forbs (CMF), and Agriophyllum squarrosum + Setaria viridis (ASGB) to investigate the characteristics of soil carbon and nitrogen density and their influencing factors. The results showed that: (1) In the 0-100 cm soil layer, SOC, TN, and total phosphorus (TP) followed the order: ASP community > CMF community > ASGB community. SOC and TN decreased with increasing soil depth, while TP and total potassium (TK) remained relatively stable. (2) The ASP community exhibited the highest soil stoichiometric ratios (C∶P, C∶K, N∶P, N∶K, P∶K), whereas the ASGB community showed significantly higher C∶N in the 20-40 cm layer compared to ASP. Soil C∶P, C∶K, N∶K, and P∶K ratios generally decreased with depth. (3) Soil organic carbon density (SCD) and soil nitrogen density (SND) in the 0-10, 10-20 cm and 20-40 cm layers followed the order: ASP > CMF > ASGB. SCD in all three communities initially decreased and then increased with depth, while the ASP community displayed an opposite trend for SND. (4) The contribution rates of soil C∶N and clay to SCD were 15.5% and 11.7%, respectively; the contribution rates of soil N∶P, N∶K and clay to SND were 23.7%,22.3% and 8.4%, respectively.

Key words: Horqin Sandy Land, soil nutrients, stoichiometry, soil nitrogen density, organic carbon density

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