大狼毒入侵對滇西北亞高山草甸土壤-植物碳氮磷生態(tài)化學(xué)計量的影響

打開文本圖片集

中圖分類號：S153 文獻(xiàn)標(biāo)識碼：A 文章編號：1007-0435（2025）05-1523-11

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 ofthe subalpine mountains in northwest Yunnan as the research object.Through field investigation and indoor analysis，the relationship between diferent 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 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 O.48， indicating that soil nutrients are mainly limited by N ，and P element is relatively abundant.Correlation analysis found that the Grassvegetation 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.

KeyWords：Subalpine Meadow;Euphorbia jolkinii Boiss; Invasion Level;SoilNutrients;Ecological Stoichi ometry

滇西北地區(qū)位于青藏高原東南部、橫斷山區(qū)的核心地帶，該地區(qū)的植物多樣性極為豐富[1]。（剩余14965字）