Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (5): 1523-1533.DOI: 10.11733/j.issn.1007-0435.2025.05.018

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The Impact of Euphorbia jolkinii Boiss. Invasion on the Soil-Plant Carbon, Nitrogen, and Phosphorus Ecological Stoichiometry in Subalpine Meadows of Northwest Yunnan

WANG Jia-jing1, HE Si-teng1, LIANG Xin-ran1, YANG Meng-jiao2, ZHANG Ya2, YANG Zhi-xin1, HE Yong-mei1   

  1. 1. College of Resources and Environment, Yunnan Agricultural University, Kunming, Yunnan Province 650051, China;
    2. Kunming Comprehensive Survey Center of Natural Resources, China Geological Survey, Kunming, Yunnan Province 650100, China
  • Received:2024-07-26 Revised:2024-09-12 Online:2025-05-15 Published:2025-05-20

大狼毒入侵对滇西北亚高山草甸土壤-植物碳氮磷生态化学计量的影响

王佳婧1, 贺思腾1, 梁新然1, 杨梦娇2, 张亚2, 杨志新1, 何永美1   

  1. 1. 云南农业大学资源与环境学院, 云南 昆明 650051;
    2. 中国地质调查局昆明自然资源综合调查中心, 云南 昆明 650100
  • 通讯作者: 杨志新,E-mail:1213594226@163.com;何永美,E-mail:heyongmei06@126.com
  • 作者简介:王佳婧(1999-),女,回族,云南勐海人,硕士研究生,主要从事农业环境保护研究,E-mail:kyzdhc@163.com
  • 基金资助:
    中国地质调查局地调项目(DD20230482);自然资源综合调查指挥中心科技创新基金(KC20230019,KC20230021);云南省自然科学基金青年项目(202401AU070080)资助

Abstract: Exploring the invasion of Euphorbia jolkinii Boiss. in the alpine meadows of northwest Yunnan can provide a basis for the management and restoration of alpine meadows. This article took the invasion of E. jolkinii into the meadow of the subalpine mountains in northwest Yunnan as the research object. Through field investigation and indoor analysis, the relationship between different degrees of invasion (moderate, severe, extremely severe) and the carbon (C), nitrogen (N), phosphorus (P) content and ecological stoichiometry of the soil plant system was studied. The results showed that the invasion of E. jolkinii increased soil organic C, total N, and total P content by 8.8% to 21.6%, 18.8% to 26.8%, and 13.4% to 49.9%, respectively, and led to an increase in plant organic C content while reducing total N and total P content; The soil C∶N and N∶P decreased, while the plant C∶N and C∶P increased; Among them, the minimum value of soil C∶N is 27.00, and the maximum value of N∶P is 0.48, indicating that soil nutrients are mainly limited by N, and P element is relatively abundant. Correlation analysis found that the Grass vegetation cover index (GDI) was significantly negatively correlated with soil C∶N and microbial biomass N, while significantly positively correlated with plant N content, indicating that GDI is constrained by N element. In summary, the invasion of E. jolkinii can alter the nutrient content of soil and plants in the subalpine grasslands of northwest Yunnan, leading to soil nitrogen being the main limiting factor for their productivity.

Key words: Subalpine Meadow, Euphorbia jolkinii Boiss., Invasion Level, Soil Nutrients, Ecological Stoichiometry

摘要: 探究滇西北亚高山草甸大狼毒(Euphorbia jolkinii Boiss.)的入侵问题,可为高山草甸的治理恢复提供依据。本文以滇西北亚高山大狼毒入侵草甸为研究对象,通过野外调查与室内分析,研究不同入侵程度(中度、重度、极重度)对土壤-植物系统碳(C)、氮(N)、磷(P)含量及其生态化学计量的关系。结果表明,大狼毒入侵导致土壤有机C、全N、全P含量分别增加8.8%~21.6%,18.8%~26.8%,13.4%~49.9%,并导致植物有机C含量增加,全N和全P含量降低;而土壤C∶N,N∶P降低,植物C∶N,C∶P增加;其中,土壤C∶N最小值为27.00,N∶P最大值为0.48,说明土壤养分主要受N限制,P元素相对较为充足。相关分析发现,牧草植被覆盖指数(Grass vegetation cover index,GDI)与土壤C∶N、微生物生物量N显著负相关,而与植物N含量显著正相关,表明GDI受制于N元素。总之,大狼毒入侵会改变滇西北亚高山草甸土壤和植物的养分含量,导致土壤N元素是其生产力的主要限制因素。

关键词: 亚高山草甸, 大狼毒, 入侵程度, 土壤养分, 生态化学计量

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