优化机采棉的辐射捕获:化学与人工打顶策略的植物功能结构建模方法

IF 5.6 1区 农林科学 Q1 AGRONOMY Field Crops Research Pub Date : 2024-08-31 DOI:10.1016/j.fcr.2024.109553
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引用次数: 0

摘要

打顶和种植密度是优化棉花植株结构以利于机采和光捕捉的关键农艺管理措施。然而,模拟这些方法对田间冠层光利用率的影响,以改善棉花管理,仍然具有挑战性。植物功能结构建模是一种计算方法,可用于探索农艺措施对塑造植物结构进而实现截光的影响。本研究首次利用 CottonXL 模型量化了在不同种植密度下,化学打顶与人工打顶对中国机采棉截获辐射的显著影响,为棉花生产提供了新的管理策略。化学打顶通过抑制叶片膨大、缩短主茎和结果枝节间,使中下部叶片截获更多 PAR,从而形成更紧凑的植株结构。模拟结果表明,与人工打顶相比,化学打顶使整个生长期冠层截获的总 PAR 增加了 11.3%。随着植株密度的增加,这种积极效果更加明显。这些结果表明,化学打顶有利于优化冠层结构、提高截光率和皮棉产量,尤其是在植株密度较高的情况下。这些结果说明了塑造植物结构对改善辐射资源捕获的重要性,并体现了优化打顶策略和植物密度以提高作物产量的潜力。这些结果还证明了植物功能结构模型在指导作物管理方面的实用性。
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Optimizing radiation capture in machine-harvested cotton: A functional-structural plant modelling approach to chemical vs. manual topping strategies

Topping and planting density are key agronomic management practices to optimize cotton plant structure for machine harvesting and light capture. However, modelling the effects of these practices on canopy light utilization in the field, in order to improve cotton management, remains challenging. Functional-structural plant modelling is a computational approach to explore the effects of agronomic practices on shaping plant architecture and thus light interception. This study, for the first time, utilizes the CottonXL model to quantify the significant impact of chemical topping compared to manual topping on radiation interception on machine-harvested cotton in China at different planting densities, providing new management strategies for cotton production. A more compact plant structure is shaped by chemical topping through inhibiting leaf expansion and shortening internodes of both the main stem and fruiting branches, thereby allowing more PAR interception by middle and lower leaves. Simulation results showed that the total PAR intercepted by the canopy over entire growth season was increased by 11.3 % under chemical topping compared to manual topping. This positive effect became even more pronounced with increasing plant density. These results indicate that chemical topping could be beneficial for optimizing canopy structure, enhancing light interception and lint yield, especially at higher plant densities. The results illustrate the importance of shaping plant structure for improving radiation resource capture and exemplify the potential of optimizing topping strategy and plant density to enhance crop performance. They also demonstrate the utility of a functional-structural plant model for guiding crop management.

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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
期刊最新文献
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