中国草地学报2025，Vol.47Issue(2)：80-90,11.DOI:10.16742/j.zgcdxb.20240245
紫花苜蓿和垂穗披碱草混播种间关系对水分的响应
Response of the Relationship between Mixed Sowing of Alfalfa and Elymus nutans to Water Content
摘要
Abstract
The establishment of mixed alfalfa(Medicago sativa)and Elymus nutans represents a criti-cal strategy for artificial grassland cultivation in arid and semi-arid regions.To elucidate their interspecific competition dynamics under varying moisture conditions,we conducted a controlled pot experiment with four soil moisture gradients:80%(W1),65%(W2),50%(W3),and 35%(W4)of saturated water hold-ing capacity.The results showed that severe water stress(W4)significantly reduced water use efficiency(WUE)in both species,while E.nutans exhibited superior water utilization capabilities compared to alfalfa under moderate drought(W3).Water deficit reduced both aboveground and underground biomass of tow forages,with alfalfa showing greater sensitivity in aboveground biomass reduction.Both species dis-played a characteristic root-to-shoot ratio pattern,initially decreasing then increasing with declining soil moisture.There was no significant difference in plant height between mixed sowing and single sowing treat-ments.There was a competitive relationship between the two herbages under W1 and W3 water treatment,and the competitiveness of alfalfa was weaker than that of E.nutans,and the competitiveness of alfalfa decreased with the decrease of soil moisture content.关键词
紫花苜蓿/垂穗披碱草/水分胁迫/种间关系Key words
Alfalfa/Elymus nutans/Water stress/Interspecific relationship分类
农业科技引用本文复制引用
赵力军,寇潇雪,王铁梅..紫花苜蓿和垂穗披碱草混播种间关系对水分的响应[J].中国草地学报,2025,47(2):80-90,11.基金项目
内蒙古自治区揭榜挂帅项目"优质苜蓿新品种选育及产业化示范"(2022JBGS0020) （2022JBGS0020）
