Studying the impact of biodiversity on ecosystem multifunctionality is helpful for clarifying the ecological mechanisms (such as niche complementary effects and selection) of ecosystems providing multiple services. Biodiversity has a significant impact on ecosystem versatility, but the relative importance of functional diversity and dominant species to ecosystem functions needs further evaluation. We studied the desert plant community in Ebinur Lake Basin. Based on field survey data and experimental analysis, the relationship between the richness and functional diversity of dominant species and the single function of ecosystem was analyzed. The relative importance of niche complementary effect and selective effect in explaining the function of plant diversity in arid areas is discussed. There was no significant correlation between desert ecosystem functions (soil available phosphorus, organic matter, nitrate nitrogen, and ammonium nitrogen) and the richness of the dominant species Nitraria tangutorum (p < 0.05). Soil organic matter and available phosphorus had significant effects on specific leaf area and plant height (p < 0.05). Functional dispersion (FDis) had a significant effect on soil available phosphorus, while dominant species dominant species richness (SR) had no obvious effect on single ecosystem function. A structural equation model showed that dominant species had no direct effect on plant functional diversity and ecosystem function, but functional diversity had a strong direct effect on ecosystem function, and its direct coefficients of action were 0.226 and 0.422. The results can help to explain the response mechanism of multifunctionality to biodiversity in arid areas, which may provide referential significance for vegetation protection and restoration for other similar areas.

中文翻译：

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功能多样性可以比主要物种更好地预测生态系统功能：以埃比努尔湖盆地的荒漠植物为例

研究生物多样性对生态系统多功能性的影响有助于阐明提供多种服务的生态系统的生态机制（如生态位互补效应和选择）。生物多样性对生态系统的多样性具有重大影响，但是功能多样性和优势物种对生态系统功能的相对重要性需要进一步评估。我们研究了埃比努尔湖盆地的荒漠植物群落。基于实地调查数据和实验分析，分析了优势种的丰富度和功能多样性与生态系统单一功能之间的关系。讨论了生态位互补效应和选择效应在解释干旱地区植物多样性的功能中的相对重要性。唐古特白刺（Nitraria tangutorum）（p <0.05）土壤有机质和有效磷对比叶面积和株高有显着影响（p<0.05）。功能分散（FDis）对土壤有效磷有显着影响，而优势种优势种丰富度（SR）对单一生态系统功能无明显影响。结构方程模型表明，优势种对植物功能多样性和生态系统功能没有直接影响，但功能多样性对生态系统功能有很强的直接影响，其直接作用系数为0.226和0.422。研究结果有助于解释干旱地区生物多样性的多功能响应机制，这可能为其他类似地区的植被保护和恢复提供参考。