SOIL MOISTURE IMPACT ON BIOMASS PARTITIONING AND RELATIVE CHLOROPHYLL CONTENT FOR LEGUME GRASS MIXTURES IN A CONTROLLED ENVIRONMENT
文献类型： 外文期刊
作者： Bai, Y. 1 ; Yan, R. 3 ; Dai, J. 4 ; Wei, Z. 5 ; Xia, J. 1 ; Yang, H. 1 ; Schellenberg, M. P. 2 ;
作者机构： 1.Binzhou Univ, Shandong Key Lab Eco Environm Sci Yellow River Del, Binzhou 256603, Peoples R China
2.Agr & Agrifood Canada, Swift Current Res & Dev Ctr, 1 Airport Rd, Box 1030, Swift Current, SK S9H 3X2, Canada
3.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China
4.Tongren Univ, Coll Agr & Forestry Engn & Planning, Tongren 554300, Peoples R China
5.Inner Mongolia Agr Univ, Coll Grassland Resources & Environm ,Minist Agr, Key Lab Grassland Resources,Key Lab Forage Cultiva, Inner Mongolia Key Lab Grassland Management & Util, 29 Erdos St, Hohhot 010011, Inner Mongolia, Peoples R China
关键词： water stress; forage mixtures; biomass; R; S ratio; relative chlorophyll content
期刊名称：APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH （ 影响因子：0.7； 五年影响因子：0.9 ）
ISSN： 1589-1623
年卷期： 2023 年 21 卷 1 期
页码：
收录情况： SCI
摘要： Drought is a widespread abiotic stress that impacts plant growth, productivity and survival. A randomized complete block design pot experiment was conducted to determine the effects of drought on above-ground biomass, root biomass, root/shoot (R/S) and relative leaf chlorophyll content (SPAD) of monoculture and legume-grass mixtures at the Swift Current Research and Development Centre (SCRDC) of Agriculture and Agri-Food Canada (AAFC). The legumes were Canadian milk-vetch (Astragalus canadensis) and white prairie-clover (Dalea candida). The grasses were northern wheatgrass (Elymus lanceolatus) and side-oats grama (Bouteloua curtipendula). Three water treatments (40%, 60% and 80% field capacity) and three cuts were the abiotic factors applied. Except for monoculture side-oats grama, multiple-species forage mixtures were more adaptable than a simple grass-legume mixture or monoculture in a water-limiting environment. The forage mixtures of Canadian milk-vetch and northern wheatgrass tolerated lower moisture levels than the other mixtures. Decreased soil moisture resulted in decreased total biomass and altered biomass allocation to roots resulting in higher R/S ratios in stressed seedlings. The SPAD value of Canadian milk-vetch mixture decreased with water stress, and white prairie-clover+ northern wheatgrass and white prairie-clover+ northern wheatgrass+ Canadian milk-vetch were better adapted to low soil moisture than the monocultures.
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