文献类型： 外文期刊

第一作者： Peng, Huiyuan

作者： Peng, Huiyuan;Zhao, Xujian;Han, Wenxuan;Peng, Huiyuan;Yan, Zhengbing;Chen, Yahan;Han, Wenxuan

作者机构：

关键词： Amaranthaceae; biomass allocation; nutrient acquisition; nutrient conservation; nutrient resorption; retranslocation; remobilization efficiency; plant size; sink pool; root to shoot ratio; stem height; diameter

期刊名称：AMERICAN JOURNAL OF BOTANY （ 影响因子：3.844； 五年影响因子：3.657 ）

ISSN： 0002-9122

年卷期： 2019 年 106 卷 3 期

页码：

收录情况： SCI

摘要： Premise of the StudyNutrient resorption is essential for plant nutrient conservation. Large-bodied plants potentially have large nutrient sink pools and high nutrient flux. Whether and how nutrient resorption can be regulated by plant size and biomass allocation are yet unknown. MethodsUsing the herbaceous plant Amaranthus mangostanus in greenhouse experiments for two consecutive years, we measured plant biomass, height, and stem diameter and calculated the root to shoot biomass ratio (R/S ratio) and nutrient resorption efficiency (NuRE) to assess the effects of plant body size and biomass allocation on NuRE. NuRE was calculated as the percentage reduction in leaf nutrient concentration from green leaf to senesced leaf. Key ResultsNuRE increased with plant biomass, height, and stem diameter, suggesting that the individuals with larger bodies, which led to a larger nutrient pool, tended to resorb proportionally more nutrients from the senescing leaves. NuRE decreased with increasing root to shoot ratio, which might have reflected the nutrient acquisition trade-offs between resorption from the senescent leaves and absorption from the soil. Increased root biomass allocation increased the proportion of nutrient acquisition through absorption more than through resorption. ConclusionsThis study presented the first experimental evidence of how NuRE is linked to plant size (indicated by biomass, height, and stem diameter) and biomass allocation, suggesting that nutrient acquisition could be modulated by the size of the nutrient sink pool and its partitioning in plants, which can improve our understanding of a conservation mechanism for plant nutrients. The body size and root to shoot ratio effects might also partly explain previous inconsistent reports on the relationships between environmental nutrient availability and NuRE.

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