Nitrogen and Water Demands for Maximum Growth of Solanum tuberosum under Doubled CO2: Interaction with Phosphorus Based on the Demands
Nitrogen and Water Demands for Maximum Growth of Solanum tuberosum under Doubled CO2: Interaction with Phosphorus Based on the Demands
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DOI：
10.1016/j.envexpbot.2020.104089
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发表时间：
2020-08
影响因子：
5.7
通讯作者：
Yan Yi;D. Sugiura;K. Yano
中科院分区：
文献类型：
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作者：
Yan Yi;D. Sugiura;K. Yano
利用升高的二氧化碳浓度（e[CO2]）促进作物生长可能会受到土壤养分有效性的限制。尽管大量研究表明氮 (N) 对于促进 e[CO2] 下生长的重要性，但很少研究植物最大生长所需的氮需求。我们发现马铃薯 (Solanum tuberosumL.) 生物量的增加取决于双倍 [CO2] 条件下磷 (P) 的可用性。为了确定马铃薯在 e[CO2] 下最大生长所需的氮是否取决于磷供应，我们根据低磷 (LP) 和高磷 (HP) 条件下的五个氮供应率，量化了马铃薯的生长和耗水量。在环境 CO2 浓度 (a[CO2]) 和双倍 a[CO2] 的 e[CO2] 水平的受控环境室中进行盆栽实验。无论 LP 下的 [CO2] 条件如何，单位面积叶面临界氮浓度（临界 [N] 面积）（90% 最大植物生长的最低氮需求量）相似 (1.43gm-2)。然而，在 HP 下，与 a[CO2] 条件 (1.52gm-2) 相比，e[CO2] 条件 (1.65gm-2) 下的临界 [N] 面积有所增加。在高压条件下，用水量不随 e[CO2] 变化，而在低压条件下，尽管由于较高的用水效率 (WUE) 导致生物量增加，但用水量随 e[CO2] 减少。尽管 e[CO2] 或 HP 的 WUE 与 N 供应无关，但 e[CO2] 或 HP 的生物量增量取决于 N 供应。我们得出的结论是，在 e[CO2] 条件下马铃薯植株所需的氮和水将取决于磷的供应。虽然在高压条件下，e[CO2]增加了氮，但在早期生长阶段获得最大生长所需的水量没有增加，但在低压条件下，氮需求不变，需水量减少了e[CO2]，这可能是由于生长受到可用磷的限制。
Crop growth promotion utilizing elevated carbon dioxide concentrations (e[CO2]) may be limited by soil nutrient availability. Although numerous studies have suggested the importance of nitrogen (N) for the promotion of growth under e[CO2], N requirement for maximum plant growth is rarely examined. We have found that increase in potato (Solanum tuberosumL.) biomass depends on phosphorus (P) availability under doubled [CO2] conditions. To address whether the N requirement for maximum growth under e[CO2] is dependent on P supply or not in potatoes, we quantified potato growth and water consumption in response to five N supply rates at low P (LP) and high P (HP) conditions. A pot experiment was conducted in controlled-environment chambers with ambient CO2concentrations (a[CO2]) and an e[CO2] level of double a[CO2]. Foliar critical N concentration per area (critical [N]area), the minimum N requirement for 90% maximum plant growth, was similar (1.43 g m-2) regardless of [CO2] conditions under LP. Under HP, however, the critical [N]areaincreased under e[CO2] conditions (1.65 g m-2) compared with a[CO2] conditions (1.52 g m-2). Water use did not change with e[CO2] under HP conditions, whereas it decreased with e[CO2] under LP conditions despite the increase in biomass owing to higher water-use efficiency (WUE). Although WUE with e[CO2] or HP was independent of N supply, biomass increment with e[CO2] or HP depended on N supply. We concluded that the N and water required by potato plants under e[CO2] would be dependent on P supply. Although under HP, e[CO2] increased N but not water required to obtain maximum growth during the early growth stage, N demand was unchanged and water demand decreased by e[CO2] under LP conditions, probably owing to growth limited by P availability.