The impact of root systems on soil macropore abundance and soil infiltration capacity

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-02-05 DOI:10.1007/s11104-025-07237-5

Yuanyuan Qu, Qinxuan Wu, Farhat Ullah Khan, Junfeng Wang, Xiuzi Ren, Xiaohong Chai, Xuexuan Xu, Feng Du

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引用次数: 0

Abstract

Background and aims

Soil infiltration influences the amount of precipitation entering the soil, which is particularly important in water-limited regions. Investigating the impact of root decay on soil porosity and infiltration rates is essential.

Method

Natural grassland underwent a five-year film mulching treatment to suppress plant root growth, named grassland under film mulching (GFM). Simultaneously, natural recovery grassland (NRG) and farmland (FL) were selected for conducting in-situ infiltration experiments.

Results

The diameter of roots significantly influences the formation of soil macropores (p < 0.05). In the NRG soil layer less than 20 cm deep, the effective macroporosity with ø > 3 mm is significantly higher compared to other sites (p < 0.05), which leads to enhanced infiltration capability. Upon reaching a soil depth of 20 cm, the stable infiltration rate of FL was 2.00 mm/min, showing no significant change with further increases in soil depth. The stable infiltration rate of GFM is measured at 6.95 mm/min, which is 5.7 times higher than that of NRG. The effective macroporosity of GFM (ø > 3 mm) increased by 20.6 times, with macropore connectivity reaching 20.79%, meanwhile that the effective macroporosity of NRG (ø > 3 mm) decreased by 93.67%.

Conclusion

Although live roots contribute to the formation of macropores and infiltration capacity, the long and continuous biogenic macropores formed after root decay have a more pronounced effect on enhancing soil water infiltration capacity. This research endeavors to serve as a reference material for exploring the impact of grassland vegetation restoration on macropores and groundwater circulation.

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根系对土壤大孔丰度和土壤入渗能力的影响

背景与目的土壤入渗影响进入土壤的降水量，这在缺水地区尤为重要。研究根系腐烂对土壤孔隙度和入渗速率的影响是必要的。方法对天然草地进行为期5年的地膜覆盖处理，抑制植物根系生长，称为地膜覆盖草地。同时，选取自然恢复草地（NRG）和农田（FL）进行原位入渗试验。结果根系直径对土壤大孔的形成有显著影响（p < 0.05）。在深度小于20 cm的NRG土层中，ø >； 3 mm的有效孔隙度显著高于其他地点（p < 0.05），这导致入渗能力增强。当土壤深度达到20 cm时，FL的稳定入渗速率为2.00 mm/min，随着土壤深度的进一步增加，其变化不显著。GFM的稳定入渗速率为6.95 mm/min，是NRG的5.7倍。GFM （ø > 3 mm）的有效宏观孔隙度增加了20.6倍，大孔连通性达到20.79%，而NRG （ø > 3 mm）的有效宏观孔隙度下降了93.67%。结论虽然活根有助于大孔的形成和入渗能力，但根腐烂后形成的长而连续的生物源大孔对提高土壤水分入渗能力的作用更为显著。本研究旨在为探讨草地植被恢复对大孔隙和地下水循环的影响提供参考资料。

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

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.