石墨烯能够有效吸附土壤水分和养分离子，对干旱区土壤改良具有积极作用。为探究石墨烯对干旱区牧草生长和土壤养分的影响，对盆栽沙打旺（Astragalus adsurgens）、老芒麦（Elymus sibiricus）和披碱草（Elymus dahuricus）分别添加0（C₀）、25（C₁）、50（C₂）、100（C₃）、200 mg·L^-1（C₄）石墨烯，并测定牧草种子萌发、生长指标及土壤理化性质。结果表明：（1）石墨烯添加牧草种子萌发及生长表现为C₁、C₂促进，C₄抑制，C₁下老芒麦株高和叶长较C₀分别增加38.81%和31.55%（P<0.05），C₂下沙打旺总鲜重较C₀显著增加51.94%（P<0.05），而披碱草发芽势C₄较C₀减少45.46%。（2）石墨烯添加可以提高土壤含水量，并对土壤养分具有一定调节作用，C₄下老芒麦土壤有机质和全氮含量较C₀分别增加22.51%和17.82%（P<0.05）；沙打旺土壤碱解氮和速效钾含量在C₄下较C₀分别增加52.56%和14.99%（P<0.05）；披碱草土壤碱解氮和有效磷在C₄、C₁下分别较C₀增加48.37%和19.58%（P<0.05）。（3）沙打旺、老芒麦和披碱草石墨烯最适添加量分别为50、25、25 mg·L^-1。适度石墨烯添加可以促进牧草生长，提高土壤养分利用效率，但高浓度石墨烯添加将产生抑制作用。

Graphene is a new type of carbon material. Its unique material properties enable it to effectively adsorb soil moisture and nutrient ions， which has a positive effect on soil improvement in arid areas. However， there are few studies on the application of graphene in arid areas. To investigate the effects of graphene on grass growth and soil nutrients in arid areas. Using Astragalus adsurgens， Elymus sibiricus， and Elymus dahuricus as materials， five addition levels of graphene were set （C₀：0 mg·L^-1， C₁：25 mg·L^-1， C₂：50 mg·L^-1， C₃：100 mg·L^-1， C₄：200 mg·L^-1）.Conduct seed germination experiments and pot experiments， and determine grass growth indicators and soil physicochemical properties.The results showed that： （1） The germination and growth of grass seeds with graphene addition showed promotion at concentrations of 25 and 50 mg·L^-1， and inhibition at a concentration of 200 mg·L^-1.Under C₁ treatment， the plant height and leaf length of Elymus sibiricus increased by 38.81% and 31.55%， respectively， compared to C₀ treatment （P<0.05）， under C₂ treatment， the total fresh weight of Astragalus adsurgens significantly increased by 51.94% （P<0.05） compared to C₀ treatment， while under C₄ treatment， the germination potential of Elymus dahuricus decreased by 45.46% compared to C₀ treatment. （2） Graphene can increase soil water content and regulate soil nutrients. Under C₄ treatment， the soil organic matter and total nitrogen content of Elymus sibiricus increased by 22.51% and 17.82% （P<0.05）， respectively， compared to C₀ treatment； The content of alkali hydrolyzed nitrogen and available potassium in the soil of Astragalus adsurgens increased by 52.56% and 14.99% （P<0.05） in C₄ treatment compared to C₀ treatment， respectively； The alkaline nitrogen and available phosphorus in the soil of Elymus dahuricus increased by 48.37% and 19.58% （P<0.05） in C₄ and C₁ treatments compared to C₀ treatments， respectively. （3） The optimal addition amounts of graphene for Astragalus adsurgens， Elymus sibiricus， and Elymus dahuricus are 50， 25， and 25 mg·L^-1， respectively. In general， the moderation of the graphene addition can promote grass growth and improve soil nutrient utilization efficiency， but high concentration graphene addition will have an inhibitory effect on grass growth.