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中国沙漠 ›› 2025, Vol. 45 ›› Issue (1): 151-161.DOI: 10.7522/j.issn.1000-694X.2024.00089

• • 上一篇    

海拔对马衔山生态系统土壤-微生物碳氮磷计量特征的影响

李玉倩1,2(), 王旭洋1,2(), 林宏东3, 牟晓明1,2, 刘伟媛4, 连杰1,2, 李玉强1,2   

  1. 1.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
    2.中国科学院大学,北京 100049
    3.甘肃兴隆山国家级自然保护区管护中心,甘肃 榆中 730100
    4.奈曼旗大柳树国有治沙林场,内蒙古 奈曼旗 028300
  • 收稿日期:2024-08-28 修回日期:2024-09-24 出版日期:2025-01-20 发布日期:2025-01-13
  • 通讯作者: 王旭洋
  • 作者简介:王旭洋(E-mail: xuyangwang@lzb.ac.cn
    李玉倩(2001—),女,甘肃兰州人,硕士研究生,主要研究方向为土壤生态化学计量。E-mail: liyuqian0730@163.com
  • 基金资助:
    甘肃省自然科学基金项目(22JR5RA076);中国科学院青年创新促进会项目(2023449)

Effects of altitude gradient on soil microbial carbon, nitrogen and phosphorus stoichiometric characteristics in Maxian Mountain ecosystem

Yuqian Li1,2(), Xuyang Wang1,2(), Hongdong Lin3, Xiaoming Mou1,2, Weiyuan Liu4, Jie Lian1,2, Yuqiang Li1,2   

  1. 1.Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.Management and Conservation Center of Xinglong Mountain National Nature Reserve,Yuzhong 730100,Gansu,China
    4.Naiman Banner Big Willow State-owned Sand Control Forest Farm,Naiman Banner 028300,Inner Mongolia,China
  • Received:2024-08-28 Revised:2024-09-24 Online:2025-01-20 Published:2025-01-13
  • Contact: Xuyang Wang

摘要:

为探究山地生态系统土壤-微生物碳氮磷生态化学计量特征沿海拔梯度的变化规律及其影响因素,选择马衔山沿海拔梯度的高山草原、亚高山灌丛、高山灌丛、高山草甸作为研究对象,通过测定0~20、20~40 cm层次土壤碳氮磷、微生物生物量碳氮磷和其他理化指标,分析马衔山不同海拔区域景观土壤碳氮磷、微生物生物量碳氮磷及其生态化学计量变化特征和影响因素。结果表明:(1)土壤有机碳(SOC)、全氮(TN)和全磷(TP)含量均沿海拔升高呈显著增加趋势,且随土壤深度增加显著降低,表层土壤(0~20 cm)微生物生物量碳(MBC)含量沿海拔显著增加,微生物生物量磷(MBP)含量沿海拔呈先降低后增加的趋势,深层土壤(20~40 cm)MBC含量沿海拔呈现先降低后升高的变化趋势,在亚高山灌丛达到最小值,MBP含量随海拔升高呈先上升后下降的变化趋势,并在亚高山灌丛达到最大值;(2)土壤C∶P、C∶N均沿海拔呈现先增加后减小的趋势,且最大值均出现在高山灌丛(36.16和11.88),表层土壤MBN∶MBP随海拔升高呈先增加后减小的变化趋势,在亚高山灌丛出现最大值(9.16),MBC∶MBN整体沿海拔显著增加,深层土壤MBC∶MBP随海拔升高呈先减小后增加的变化趋势,在亚高山灌丛出现最小值(8.40);(3)土壤pH、电导率、地下生物量等与土壤-微生物碳氮磷及生态化学计量显著相关,pH是土壤微生物生物量碳氮磷及其化学计量海拔分布格局的关键驱动因素。

关键词: 海拔梯度, 马衔山, 土壤微生物生物量, 生态化学计量

Abstract:

In order to investigate the changing patterns of soilmicrobial carbon, nitrogen and phosphorus ecological stoichiometry in mountain ecosystems along the altitude gradient and the factors affecting them, we selected alpine grassland (AG), subalpine scrub (SS), alpine scrub (AS) and alpine meadow (AM) along the altitude gradient of the Maxian Mountains as the research objects, and analyzed the changes in the characteristics and factors affecting the ecological stoichiometry of the soil carbon, nitrogen and phosphorus, microbial biomass carbon, nitrogen and phosphorus and other physicochemical indicators at different altitudes in the landscape of Maxian Mountains. By measuring soil carbon, nitrogen and phosphorus, microbial biomass carbon, nitrogen and phosphorus and other physicochemical indicators at 0-20 cm and 20-40 cm levels, we analyzed the characteristics and influencing factors of soil carbon, nitrogen and phosphorus, microbial biomass carbon, nitrogen and phosphorus and their ecological stoichiometry in the landscape of Maxian Mountain at different altitudes. The results showed that: (1) soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) contents showed a significant increase along the altitude and decreased significantly with the increase of soil depth, the microbial biomass carbon (MBC) content of the surface soil (0-20 cm) increased significantly along the altitude, and microbial biomass phosphorus (MBP) content showed a decreasing and then increasing trend along altitude, and the content of MBC in deep soil (20-40 cm) decreased first and then increased along the altitude, and reached the minimum value in the subalpine shrub, and the MBP content increased first and then decreased with the elevation, and reached the maximum value in the subalpine shrub. (2) Soil C∶P and C∶N showed a trend of increasing and then decreasing along the elevation, and the maximum values appeared in the alpine scrub (36.16 and 11.88), and the maximum value appeared in the alpine scrub. Surface soil MBN∶MBP showed an increasing and then decreasing trend with elevation, and the maximum value appeared in the subalpine scrub (9.16), MBC:MBN increased significantly along the elevation as a whole, and deep soil MBC∶MBP showed a decreasing and then increasing trend with elevation, and the minimum value appeared in the subalpine scrub (8.40). (3) Soil pH, electrical conductivity and underground biomass were significantly correlated with soil-microbial carbon, nitrogen and phosphorus and ecological stoichiometry, and pH was a key driver of the elevation distribution pattern of soil microbial biomass carbon, nitrogen and phosphorus and their stoichiometry. In conclusion, the changes of soil microbial biomass carbon, nitrogen and phosphorus and its ecological stoichiometry along the altitude gradient are the result of the comprehensive effects of soil nutrients and environmental factors. This study is of great significance to reveal the response mechanism of soil nutrient cycling to environmental change in mountain ecosystems.

Key words: altitude gradient, Maxian Mountains, soil microbial biomass, ecological stoichiometry

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