以艾比湖流域荒漠生态系统为研究对象，基于Margalef丰富度指数和功能丰富度指数，对植物多样性与生态系统多功能性的关系进行了研究。结果表明：高水盐环境（土壤含水量10.93%，土壤含盐量5.95 g·kg^-1）下，群落主要由胡杨（Populus euphratica Oliv.）和柽柳（Tamarix chinensis Lour.）等乔木组成；中水盐环境（土壤含水量6.87%，土壤含盐量3.96 g·kg^-1）下，群落主要由白刺（Nitraria tangutorum Bobr.）、罗布麻（Apocynum venetum Linn.）和铃铛刺〔Halimodendron halodendron （Pall.） Voss〕等灌木组成；低水盐环境（土壤含水量2.91%，土壤含盐量2.58 g·kg^-1）下，群落主要由沙蓬〔Agriophyllum squarrosum （Linn.） Moq.〕和小獐毛〔Aeluropus pungens （M. Bieb.） C. Koch〕等草本组成。高、中和低水盐环境下，Margalef丰富度指数的差异不显著（P＞0.05）；功能丰富度指数分别为10.83、8.73和6.87，三者间差异显著（P＜0.05）；高和中水盐环境下，生态系统多功能性指数显著高于低水盐环境。高和中水盐环境下，Margalef丰富度指数与功能丰富度指数呈显著相关关系，拟合系数（R²）分别为0.319和0.313；低水盐环境下，二者间的相关关系不显著。高水盐环境下，Margalef丰富度指数和功能丰富度指数与生态系统单一功能间相关关系均不显著；中和低水盐环境下，Margalef丰富度指数仅与植物叶片有机碳含量呈显著相关关系，R2分别为0.214和0.274。高水盐环境下，功能丰富度指数与生态系统多功能性指数呈显著相关关系，R2为0.327；中水盐环境下，Margalef丰富度指数与生态系统多功能性指数呈显著相关关系，R2为0.152。对于整个样地，土壤含水量对生态系统多功能性的重要性最高，功能丰富度指数的重要性高于Margalef丰富度指数。综上所述，随着土壤含水量的降低，Margalef丰富度指数与功能丰富度指数间相关关系减弱。非生物因子中土壤含水量对生态系统多功能性影响最大，进一步说明土壤含水量对生态系统多功能性的限制性作用；生物因子中功能丰富度指数对生态系统多功能性起主要作用。

Taking the desert ecosystem in Ebinur Lake basin as research object， the relationship between plant diversity and ecosystem multifunctionality was studied based on Margalef richness index and functional richness index. The results show that in high water-salt environment （soil water content of 10.93% and soil salt content of 5.95 g·kg^-1）， the community is mainly composed of arbors including Populus euphratica Oliv. and Tamarix chinensis Lour.， etc.； in medium water-salt environment （soil water content of 6.87% and soil salt content of 3.96 g·kg^-1）， the community is mainly composed of shrubs including Nitraria tangutorum Bobr.， Apocynum venetum Linn.， and Halimodendron halodendron （Pall.） Voss， etc.； in low water-salt environment （soil water content of 2.91% and soil salt content of 2.58 g·kg^-1）， the community is mainly composed of herbs including Agriophyllum squarrosum （Linn.） Moq. and Aeluropus pungens （M. Bieb.） C. Koch， etc. The differences in Margalef richness index are not significant （P＞0.05） among high, medium, and low water-salt environments； the functional richness indexes in above three water-salt environments are 10.83， 8.73， and 6.87, respectively， and there are significant （P＜0.05） differences among them； the ecosystem multifunctionality indexes in high and medium water-salt environments are significantly higher than that in low water-salt environment. In high and medium water-salt environments， the Margalef richness index is significantly correlated with functional richness index， and the fit coefficients （R²） are 0.319 and 0.313, respectively； in low water-salt environment， the correlation between them is not significant. In high water-salt environment， the correlations of Margalef richness index and functional richness index with ecosystem single function are not significant； in medium and low water-salt environments， the Margalef richness index only shows significant correlations with organic carbon content in plant leaf， and R² are 0.214 and 0.274, respectively. In high water-salt environment， the functional richness index shows a significant correlation with ecosystem multifunctionality index， and R² is 0.327； in medium water-salt environment, the Margalef richness index shows a significant correlation with ecosystem multifunctionality index， and R² is 0.152. The importance of soil water content to ecosystem multifunctionality is the highest， and that of functional richness index is higher than that of Margalef richness index in the whole sample plot. Taken together， with the decreasing of soil water content， the correlation between Margalef richness index and functional richness index decreases. Among abiotic factors， soil water content has the greatest influence on ecosystem multifunctionality， which further indicates that soil water content has a restrictive effect on ecosystem multifunctionality； among biotic factors， functional richness index has the dominant effect on ecosystem multifunctionality.