Dynamic characteristics of drought conditions during the growth of summer maize

IF 1.5 4区环境科学与生态学 Q4 WATER RESOURCES

Water Policy Pub Date : 2022-10-11 DOI:10.2166/wp.2022.065

Bifeng Cui, Jianqing Ma, Lei Liu, X. Hao, Zhirui Song, Cheng Fang

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Abstract

This study aimed at investigating the applicability of a SWAT (Soil and Water Assessment Tool) model in understanding the effects of drought on summer maize. A real-time irrigation module was developed for the downstream irrigation area of the Yellow River to estimate the real-time irrigation of crops. By further simulating the dynamic evolution process of soil moisture content, a dynamic drought evaluation model of summer maize was established, and the relative soil moisture was set as the evaluation index to assess and analyze the dynamic variation of drought evolution during the growth of summer maize. The results showed that the improved SWAT model has strong applicability. During the growth of summer maize, the variation trend of drought is consistent with that of natural precipitation. Moreover, drought mainly occurs during the sowing-seedling and seedling-jointing stages, and the average frequency is 84.8 and 78.3%, respectively. Moderate drought is most likely to occur during the growth of summer maize and occurs mainly during the sowing-seedling and seedling-jointing stages, and the occurrence frequency is 55.3 and 32.6%, respectively. Extra-severe drought has the greatest impact, mainly in the jointing-tasseling, tasseling-milking and milking-maturity stages, and the occurrence frequency is 17.4, 15.2 and 10.9%, respectively.

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夏玉米生长过程中干旱条件的动态特征

本研究旨在调查SWAT（土壤和水评估工具）模型在了解干旱对夏玉米影响方面的适用性。针对黄河下游灌区，开发了一个实时灌溉模块，用于估算作物的实时灌溉量。通过进一步模拟土壤含水量的动态演变过程，建立了夏玉米干旱动态评价模型，并以相对土壤含水量为评价指标，对夏玉米生长过程中干旱演变的动态变化进行了评价和分析。结果表明，改进后的SWAT模型具有较强的适用性。在夏玉米生长过程中，干旱的变化趋势与自然降水的变化趋势一致。干旱主要发生在播种期和拔节期，平均发生率分别为84.8%和78.3%。中度干旱最易发生在夏玉米生长期间，主要发生在播种期和拔节期，发生频率分别为55.3%和32.6%。特大干旱影响最大，主要发生在拔节抽雄、抽雄挤奶和挤奶成熟期，发生频率分别为17.4%、15.2%和10.9%。

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来源期刊

Water Policy 环境科学-水资源

CiteScore

3.10

自引率

12.50%

发文量

审稿时长

6-12 weeks

期刊介绍： Water Policy will publish reviews, research papers and progress reports in, among others, the following areas: financial, diplomatic, organizational, legal, administrative and research; organized by country, region or river basin. Water Policy also publishes reviews of books and grey literature.