探索玉米冠层对喷灌水滴飞溅侵蚀决定因素时空分布异质性的影响

IF 5.9 1区农林科学 Q1 AGRONOMY

Agricultural Water Management Pub Date : 2024-11-12 DOI:10.1016/j.agwat.2024.109158

Zhongrui Zhu , Jiusheng Li , Delan Zhu

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引用次数: 0

摘要

为了全面了解喷灌-作物-土壤的连续性，防止喷灌水土流失，确保喷灌技术的良好发展，必须对喷灌水滴物理参数的时空变异性和飞溅侵蚀潜力进行表征。利用二维视频测距仪研究了玉米冠层和喷灌机特征对直流水滴时空分布模式、水滴物理参数和飞溅侵蚀潜力的影响。结果表明，MC 对直落水的产生有负面影响。灌溉特性并不能从根本上扭转 MC 对喷灌水量分布均匀性的影响。与前期相比，后期的大量直落水出现在茎基部附近。MC 降低了喷灌水滴的 KEV 和 SER。滴落在玉米叶片上的水滴会造成飞溅侵蚀。直落水滴的 KEV 和 SER 的 SDP 规律基本相同。与其他研究结果相反，在喷洒 1.48 毫米的水滴时，直落式水滴的 DD 值随之增加。MC 对喷洒水的 DD 的 CV 有积极影响。滴水和未充分破碎的水滴体积比例的变化导致了贯通落差的 SDP。不同生长阶段的直落水滴 Veq 百分比分别为 86.81 %、77.06 %、55.08 % 和 51.48 %。只有 1.48 mm 的处理增加了直落水滴的 Veq。MC 和 DD 影响了通流液滴 Veq 的分布异质性。大液滴 Veq 的差异是通流液滴速度 SDP 的原因。只有使用小液滴的处理方法能显著减少直落液滴的数量。而直落液滴数量的特征是，离茎越远，SDP 值越大，而其他则相反。这些结果将为喷灌-作物-土壤连续体的多样化提供理论和应用意义，并阐明喷灌在农田水文地球化学循环中的作用。

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Exploring the effects of maize canopy on the spatiotemporal distribution heterogeneity of the determinants of sprinkler irrigation droplet splash erosivity

To fully understand the sprinkler irrigation-crop-soil continuum, prevent sprinkler erosion, and ensure good development of sprinkler technology, it is essential to characterize the spatiotemporal variability of physical parameters and the splash erosion potential of sprinkler water droplets. The influences of maize canopy and sprinkler characteristics on the spatiotemporal distribution patterns of throughfall, droplet physical parameters, and splash erosion potential were investigated using a 2D-Video-Distrometer. The results showed that MC negatively affected throughfall generation. Irrigation characteristics could not fundamentally reverse the influence of MC on the sprinkler water distribution evenness. Compared to the early stages, the large throughfall at the later stages occurred near the stem base. MC reduced the KE_V and SER of sprinkler water droplets. Dripping drops generated on maize leaves caused splash erosion. The SDP laws of KE_V and SER of throughfall droplets were basically the same. Contrary to others, the DD of throughfall increased concomitant with the application of sprinkler droplets of 1.48 mm. MC positively influenced the CV of the DD of sprinkler water. Changes in the volume proportions of dripping drops and inadequately breaking droplets resulted in the SDP of the DD of throughfall. The percentages of the V_eq of throughfall droplets at different growth stages were 86.81 %, 77.06 %, 55.08 %, and 51.48 %, respectively. Only treatments of 1.48 mm increased the V_eq of throughfall droplets. MC and DD affected the distribution heterogeneity of the V_eq of throughfall droplets. Differences in the V_eqs of large droplets were responsible for the SDP of the velocities of throughfall droplets. Only treatments with small droplets significantly reduced the number of throughfall droplets. And the number of throughfall droplets characterized a SDP with greater values the farther from the stem, whereas others were opposite. The results will provide theoretical and applied implications for diversifying the sprinkler-crop-soil continuum and elucidate the involvement of sprinkler irrigation in the hydrogeochemical cycle of agricultural land.

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来源期刊

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.