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

第一作者： Bai, Y.

作者： Bai, Y.;Xia, J.;Yang, H.;Bai, Y.;Schellenberg, M. P.;Yan, R.;Dai, J.;Wei, Z.

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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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