差巴嘎蒿凋落物水浸提液对4种牧草种子萌发的影响研究  

Effect of litter water extraction of Artemisia halodendron on seed germination of four forage species

作　　者：丁杰萍 罗永清 DING Jie-ping;LUO Yong-qing(Gansu Academy of Eco-environmental Sciences,Lanzhou 730020,China;Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]甘肃省生态环境科学设计研究院,甘肃兰州730020 [2]中国科学院西北生态环境资源研究院奈曼沙漠化研究站,甘肃兰州730000

出　　处：《环境生态学》2022年第8期40-46,共7页Environmental Ecology

基　　金：国家自然基金项目(31500369);甘肃省科协青年科技人才托举工程(基于黄河流域甘肃段水环境质量的产业结构优化和环境质量提高模式研究)资助。

摘　　要：差巴嘎蒿(Artemisia halodendron)是呼伦贝尔沙地和科尔沁沙地半固定沙丘的优势灌木之一,可通过强烈的化感作用限制其他物种的种子萌发和幼苗生长。种子添加是植被群落结构优化的有效措施,而物种选择是种子添加的关键。因此,选取两种不同种源4个牧草物种[冰草(Agropyron cristatum)、达乌里胡枝子(Lespedeza davurica)、无芒雀麦(Bromus inermis)和紫花苜蓿(Medicago sativa)],用差巴嘎蒿根、茎和叶凋落物的水浸提液进行处理,研究了不同类型和浓度(0、10、20、40、60、80和100 g/L)浸提液对4种牧草种子萌发的影响。结果表明,差巴嘎蒿凋落物水浸提液对乡土物种冰草和达乌里胡枝子具有强烈的化感抑制效应,不同类型凋落物的抑制效应存在差异。而对于引进物种无芒雀麦和紫花苜蓿,差巴嘎蒿各类凋落物水浸提液均对其没有显著影响(p<0.05),表明这两个物种对差巴嘎蒿的化感效应有较高的耐受性。因此,从种子萌发角度来看,无芒雀麦和紫花苜蓿在半固定沙丘植被群落结构优化方面具有一定的应用潜力。Artemisia halodendron is one of the dominant shrubs in semi-fixed dunes in Hulun Buir and Horqin sandy land,which strongly suppressed seed germination and seedling growth of other species by its allelopathy.Seed addition is an effective pathway to optimize the vegetation community,and species selection is the key to seed addition.In this study,four forege species were selected from two different sources including two native species(Agropyron cristatum and Lespedeza daurica)and two introduced species(Bromus inermis and Medicago sativa)and treated with water extracts from roots,stems and leaf litters of A.halodendron,then effects of different types and concentrations(0,10,20,40,60,80 and 100 g/L)of extractions on seed germination of these four forage species were studied.The result showed that,the water extraction of A.halodendron litters had strong allelopathic inhibitory effect on native species of A.cristatum and L.daurica,and these inhibitory effect of differed among species and litter type.While for the introduced species of B.inermis and M.sativa,all types of the litter water extract of various litters of A.halodendron had no significant effect on them,this indicated that these two species had high tolerance to allelopathic effect of A.halodendron.Therefore,from the perspective of seed germination,B.inermis and M.sativa,have certain application potential in the community optimization of semi-fixed dune vegetation.

关 键 词：差巴嘎蒿 凋落物 化感效应 水浸提液 种子萌发 

分 类 号：X171.4[环境科学与工程—环境科学] Q948[生物学—植物学]