番茄果实生长对水氮源库比响应的模型辅助分析

IF 5.9 1区 农林科学 Q1 AGRONOMY
Huiping Zhou , Jinliang Chen , Shaozhong Kang
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引用次数: 0

摘要

水分和氮是影响番茄植株-果实系统的重要因子。然而,水和氮在多大程度上调节源库系统之间的水碳通量,从而影响果实生长,目前尚不清楚。本研究通过对不同水分和氮条件下番茄的试验观察,提出了源汇比(Rss),并利用WN-Jensen函数将其与水分和氮供应联系起来。采用一个过程模型,通过修改一个主要模型输入,即韧皮部溶液中蔗糖浓度(Cp),研究了水分和氮供应对果实生长的影响,该模型假定Cp与Rss成正比。然后用在不同水分和氮条件下生长的番茄的数据集来评估该模型。结果表明,果实早全生育期氮素亏缺和水分胁迫对植株和果实生长均有显著限制,茎秆水势低,耗水量低;通过修正Cp,考虑了水分和氮对源库调节的影响,较好地模拟了果实生长动态。与原始模型模拟相比,果实生长预测的MAE和RRMSE分别降低了82.0 %和79.9% %。改进后的模型对水果鲜重和干重的模拟效率分别在77.4% % ~ 96.4 %和72.9 % ~ 92.9 %范围内。模型辅助分析表明,在考虑源库关系的水氮调控下,在保证果实生长相同的情况下,可在果实早、中、后期分别减少11.9% %、27.0% %和41.1% %的供水量,同时减少27.5% %的施氮量(节约投资131美元/公顷)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Model-assisted analysis on the response of tomato fruit growth to source-sink ratio regulated by water and nitrogen
Water and nitrogen (N) are essential factors affecting the tomato plant-fruit system. However, little is known about to what extent water and N could regulate the water and carbon fluxes between the source-sink system, thus influencing fruit growth. In this study, the source-sink ratio (Rss) was proposed and then related to water and N supply by a WN-Jensen function, according to the experimental observations from tomatoes grown under various water and N conditions. A process-based model was applied to investigate the effects of water and N supply on fruit growth through modifying one of the major model inputs, the sucrose concentration in phloem solution (Cp), which was assumed to be proportional to Rss. The model was then assessed with the data sets from tomatoes grown under different water and N conditions. The results showed that, N deficit and water stress at fruit early /whole growth stage had significant limitation on plant and fruit growth, together with low stem water potential and water consumption. The dynamics of fruit growth were better simulated by the model when the effects of water and N on source-sink regulation were taken into consideration through modifying Cp. Compared to the original model simulation, MAE and RRMSE of fruit growth prediction decreased by up to 82.0 % and 79.9 %. The simulation efficiency of fruit fresh and dry weights was in the range of 77.4 %-96.4 % and 72.9 %-92.9 % by the modified model, respectively. Model-assisted analysis showed that water supply could be reduced by 11.9 %, 27.0 % and 41.1 % at fruit early, middle and late stage together with a reduction of 27.5 % N application (saving investment of 131 $/ha), while ensuring the same fruit growth by considering water and nitrogen regulation on source-sink relation.
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来源期刊
Agricultural Water Management
Agricultural Water Management 农林科学-农艺学
CiteScore
12.10
自引率
14.90%
发文量
648
审稿时长
4.9 months
期刊介绍: Agricultural Water Management publishes papers of international significance relating to the science, economics, and policy of agricultural water management. In all cases, manuscripts must address implications and provide insight regarding agricultural water management.
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