黄土丘陵区不同饲草混播模式对种间关系的影响  

Effects of Different Forage Mixed Patterns on Interspecific Relationships in Loess Hilly Areas

作　　者：李兴龙 师尚礼[1] 黄宗昌 李革革 吴芳[1] 张辉辉 LI Xing-long;SHI Shang-li;HUANG Zong-chang;LI Ge-ge;WU Fang;ZHANG Hui-hui(College of Grassland Science, Gansu Agricultural University, Grassland Ecosystem Key Laboratory of Ministry of Education, Sino-U.S. Research Centers for Sustainable Grassland and Livestock Management, Lanzhou, Gansu Province 730070, China)

机构地区：[1]甘肃农业大学草业学院,草业生态系统教育部重点实验室,中-美草地畜牧业可持续研究中心,甘肃兰州730070

出　　处：《草地学报》2021年第6期1318-1326,共9页Acta Agrestia Sinica

基　　金：宁夏回族自治区重点研发计划(2017BY082);国家现代农业产业技术体系(CARS-34);农业农村部农牧交错带优质青粗饲料资源开发利用技术集成示范项目(16190051-09)资助。

摘　　要：为探究不同草种混播对饲草种间竞争的影响,筛选出适合黄土丘陵区种植推广的混播模式和混播组合,本研究于2018—2020年在宁夏回族自治区固原市原州区展开试验,设置C3+C3型禾豆混播模式:无芒雀麦(Bromus inermis)+紫花苜蓿(Medicago sativa)(BM),燕麦(Avena sativa)+箭筈豌豆(Vicia sativa)(AV);C3+C4型禾豆混播模式:玉米(Zea mays)+拉巴豆(Dolichos lablab)(ZD),高丹草(Sorghum bicolor×S.Sudanense)+拉巴豆(SD),所有混播比例均为1∶1,以相应草种单播为对照,测定各物种生物量,土地当量比(Land equivalent ratio,LER),相对产量(Relative yield,RY),竞争力(Competition ratio,CR)和侵袭力(Aggressiveness,AG)差异特征和动态特征。结果表明:各混播处理下,LER均显著高于1(P<0.05),地上生物量均高于对应单播处理;C3模式中BM组合中紫花苜蓿RY,CR和AG显著大于无芒雀麦,其余混播组合中均表现出禾本科RY,CR和AG大于豆科饲草,高丹草对拉巴豆的CR和AG高于玉米。本研究表明,玉米(C4)+拉巴豆(C3)组合资源利用效率最高,群落结构最稳定。This study was conducted in Yuanzhou District of Guyuan City,Ningxia Hui Autonomous Region from 2018 to 2020 to explore the competition effects between mixed forage species and find out mixed sowing modes that are suitable for loess hilly areas.C3+C3 mixed sowing mode was set up as:Bromus inermis+Medicago sativa(BM),Avena sativa+Vicia sativa(AV);C3+C4 mixed sowing mode was set up as:Zea mays+Dolichos lablab(ZD),Sorghum bicolor×S.sudanense+Dolichos lablab(SD).All mixed sowing ratios were 1∶1,and the corresponding grasses were used as the control.Biomass,land equivalent ratio(LER),relative yield(RY),competition ratio(CR)and aggressiveness(AG)were measured.The results showed that the LER of each mixed sowing treatment was significantly higher than 1(P<0.05),and the aboveground biomass was higher than that of the corresponding unicast treatment.In C3 mode,the RY,CR and AG of Medicago sativa in BM combination were significantly higher than those of Bromus inermis,and the RY,CR and AG of Gramineae were higher than those of Leguminosae in the other mixed sowing combinations.The CR and AG of Sorghum bicolor×S.sudanense on Lablab purpureus were higher than those of Zea mays.The resource utilization efficiency of Zea mays(C4)+Lablab purpureus(C3)combination was the highest,and the community structure was the most stable.

关 键 词：黄土高原 混播 光合类型 种间竞争 

分 类 号：S54[农业科学—作物学]