Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (9): 2748-2758.DOI: 10.11733/j.issn.1007-0435.2023.09.019

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Spatial Stability Analysis of Surface Soil Carbon,Nitrogen,and Phosphorus Densities in Alpine Grasslands in the Sanjiangyuan Region

SHU Min1,2,3,4,5, CHEN Dong-dong1,2,3,4, LI Qi1,2,3,4, ZHANG Li1,2,3,4, HE Fu-quan1,2,3,4, ZHANG Yu-kun1,2,3,4, PAN Si-chen1,2,3,4,5, ZHAO Liang1,2,3,4   

  1. 1. Qinghai Sanjiangyuan Grassland Ecosystem National Field Scientific Observation and research Station, Xining, Qinghai Province 810008, China;
    2. Key Laboratory of Plateau Adaptation and Evolution, Chinese Academy of Sciences, Xining, Qinghai Province 810008, China;
    3. Sanjiangyuan National Park Research Institute, Chinese Academy of Sciences, Xining, Qinghai Province 810008, China;
    4. Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Qinghai Province 810008, China;
    5. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2023-02-22 Revised:2023-03-21 Online:2023-09-15 Published:2023-10-07

三江源区高寒草地表层土壤碳、氮、磷密度空间稳定性分析

舒敏1,2,3,4,5, 陈懂懂1,2,3,4, 李奇1,2,3,4, 张莉1,2,3,4, 贺福全1,2,3,4, 张煜坤1,2,3,4, 潘思辰1,2,3,4,5, 赵亮1,2,3,4   

  1. 1. 青海三江源草地生态系统国家野外科学观测研究站, 青海 西宁 810008;
    2. 中国科学院高原生物适应与进化重点实验室, 青海 西宁 810008;
    3. 中国科学院三江源国家公园研究院, 青海 西宁 810008;
    4. 中国科学院西北高原生物研究所, 青海 西宁 810008;
    5. 中国科学院大学, 北京 100049
  • 通讯作者: 赵亮,E-mail:lzhao@nwipb.cas.cn
  • 作者简介:舒敏(1997-),女,汉族,四川南充人,硕士研究生,主要从事陆地碳循环方面研究,E-mail:shumin20@mails.ucas.ac.cn
  • 基金资助:
    科技基础资源调查专项(2021-FY-100705)；青海省基础研究项目(2021-ZJ-761)；2022年青海省中青年科技人才托举工程资助

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Abstract: It is of great significance to study the spatial stability of soil carbon,nitrogen and phosphorus density in the surface layer (0~10 cm) of the alpine grassland in the Sanjiangyuan to evaluate the nutrient cycle of the regional ecosystem. This study collected vegetation,soil and meteorological data from 13 counties/towns in the Sanjiangyuan region in August and September 2017,and analyzed the spatial stability and influencing factors of surface soil carbon,nitrogen and phosphorus density in the region. The results showed that the spatial distribution of soil surface carbon,nitrogen and phosphorus in the source area of the Sanjiangyuan region was mainly affected by altitude. The density of soil organic carbon,total nitrogen and total phosphorus increased first and then decreased with the increase of altitude,while the density of inorganic carbon decreased first and then increased. According to the results of spatial cluster analysis,the spatial stability of soil organic carbon and total nitrogen density decreased from the southeast to the northwest,while that of inorganic carbon was on the contrary direction,and that of total phosphorus in the southern region was higher than that in the northern region. The spatial stability of soil carbon,nitrogen and phosphorus densities in the Sanjiangyuan region was ranked as total phosphorus > total nitrogen > organic carbon > inorganic carbon,which was closely related to altitude,plant diversity,underground biomass,soil water content,soil pH value and other factors.

Key words: Soil organic carbon density, Soil total nitrogen density, Spatial stability, Sanjiangyuan region

摘要： 探究三江源区高寒草地表层(0~10 cm)土壤碳、氮、磷密度空间稳定性对评价区域生态系统养分循环具有重要意义。本研究于2017年8-9月对三江源区13个县/镇的植被、土壤和气象数据进行收集,分析了三江源区高寒草地表层土壤碳、氮、磷密度空间稳定性及影响因素。结果表明:三江源区土壤表层碳、氮、磷的空间分布主要受海拔影响,土壤有机碳、全氮、全磷密度随海拔增加呈先增加后降低的趋势,无机碳密度则呈先降低后增加的趋势。根据空间聚类分析的结果,土壤有机碳、全氮密度空间稳定性在三江源区内呈东南向西北递减的趋势,无机碳与之相反,全磷则为南部地区高于北部地区。三江源区土壤碳、氮、磷密度空间稳定性大小的排序为全磷>全氮>有机碳>无机碳,这主要与海拔、植被多样性、地下生物量、土壤含水量、土壤pH值等因子的密切相关。

关键词: 土壤有机碳密度, 土壤全氮密度, 空间稳定性, 三江源区

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