Exploring optimal straw mulch thickness during freeze–thaw periods in the central Yellow River basin: Field observations and numerical modelling

IF 1.6 4区农林科学 Q2 AGRONOMY

Irrigation and Drainage Pub Date : 2024-03-20 DOI:10.1002/ird.2949

Jing Xue, Jiangtong Lin, Junfeng Chen, Lihong Cui, Xiuqing Zheng

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引用次数: 0

Abstract

Straw mulch has been widely used to inhibit soil evaporation in semi-arid regions, but little attention has been given to exploring optimal straw mulch thicknesses for suppressing soil evaporation under different meteorological conditions in seasonally frozen soil regions. By combining field observations and numerical modelling, the optimal straw mulch thickness for inhibiting soil evaporation under different meteorological conditions was determined. Field experiments indicated that the cumulative soil evaporation associated with straw mulch thicknesses of 1–3 cm was 40%, 53% and 65% lower than that of bare land during freeze–thaw cycles. Compared with that of bare fields, the cumulative soil evaporation simulated by SHAW (simultaneous heat and water) decreased from 9% to 82% and from 36% to 88% during the 2017–2018 and 2018–2019 periods, respectively, when the straw mulch thickness ranged from 1 to 20 cm. The cumulative soil evaporation tended to stabilize until the straw mulch thickness reached 14.3 cm under weather conditions with low humidity, high wind speed and sunshine and 14.5 cm under weather conditions with high or moderate humidity, low or moderate wind speed and sunshine from 1987 to 2017. The results have implications for reducing nonproductive soil evaporation and improving agricultural water management in seasonally frozen regions.

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探索黄河流域中部冻融期最佳秸秆覆盖厚度：实地观测和数值模拟

秸秆覆盖物已被广泛用于抑制半干旱地区的土壤蒸发，但很少有人关注在季节性冻土地区探索不同气象条件下抑制土壤蒸发的最佳秸秆覆盖物厚度。通过结合实地观测和数值模拟，确定了在不同气象条件下抑制土壤蒸发的最佳秸秆覆盖厚度。田间试验表明，在冻融循环过程中，秸秆覆盖层厚度为 1-3 厘米的土壤累积蒸发量分别比裸露土地低 40%、53% 和 65%。与裸地相比，在 2017-2018 年和 2018-2019 年期间，当秸秆覆盖层厚度在 1 至 20 厘米之间时，SHAW（热量和水分同时）模拟的累积土壤蒸发量分别从 9% 降至 82%，从 36% 降至 88%。从 1987 年到 2017 年，在湿度低、风速大和日照充足的天气条件下，土壤累积蒸发量趋于稳定，直到稻草覆盖层厚度达到 14.3 厘米；在湿度高或中等、风速低或中等和日照充足的天气条件下，土壤累积蒸发量达到 14.5 厘米。研究结果对减少季节性冰冻地区非生产性土壤蒸发和改善农业用水管理具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Irrigation and Drainage 农林科学-农艺学

CiteScore

3.40

自引率

10.50%

发文量

107

审稿时长

3 months

期刊介绍： Human intervention in the control of water for sustainable agricultural development involves the application of technology and management approaches to: (i) provide the appropriate quantities of water when it is needed by the crops, (ii) prevent salinisation and water-logging of the root zone, (iii) protect land from flooding, and (iv) maximise the beneficial use of water by appropriate allocation, conservation and reuse. All this has to be achieved within a framework of economic, social and environmental constraints. The Journal, therefore, covers a wide range of subjects, advancement in which, through high quality papers in the Journal, will make a significant contribution to the enormous task of satisfying the needs of the world’s ever-increasing population. The Journal also publishes book reviews.