Effects of an arbuscular mycorrhizal fungus on Amorpha fruticosa roots and soil preferential flow in an arid area of opencast coal mine waste

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE Soil & Tillage Research Pub Date : 2024-10-05 DOI:10.1016/j.still.2024.106321
Yinli Bi , Xinpeng Du , Lexuan Tian , Mingchao Li , Kejing Yin
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Abstract

Preferential flow plays a key role in soil hydrological processes in arid and semi-arid areas of opencast coal mine waste. Inoculation with arbuscular mycorrhizal (AM) fungi can significantly affect vegetation root growth and improve soil physical structure. However, the impact on preferential flow in new areas of waste remains poorly understood. Here, the effects of AM fungal inoculation on root spatial distribution and preferential flow within the waste area at Heidaigou opencast coal mine in China were analyzed where Amorpha fruticosa was grown for revegetation. A staining tracer method and a grid sampling method were used. Preferential flow pathway development in the newly formed waste areas was affected mainly by A. fruticosa root systems, with closer proximity to A. fruticosa resulting in more preferential flow pathways. Inoculation with the AM fungus Funneliformis mosseae significantly increased preferential flow development. In the profile closest to the A. fruticosa, the dye coverage increased by 59 %, the uniform infiltration depth by 73 %, and the maximum stained depth by 80 %. Plant roots occurred mainly at 0−20 cm soil depth, accounting for ∼ 80 % of the total root length of the entire root system. In the profile closest to A. fruticosa, inoculation with F. mosseae increased the total number of roots and the root length density by 32 %. The preferential flow pathways were developed only in roots with diameters of > 2 mm and more widely distributed at both 0−10 and 10−20 cm soil depths. Substrate infiltration was influenced mainly by roots with diameters of < 4 mm but deep infiltration was more dependent on roots with diameters > 2 mm. Mycorrhizal hyphae contributed to the preferential flow. Inoculation with the AM fungus increased the preferential flow of the newly formed drainage sites and this effect should be considered in the ecological restoration of opencast coal mine wastes in arid and semi-arid areas.
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露天煤矿废弃物干旱地区丛枝菌根真菌对芒萁根系和土壤优先流动的影响
在干旱和半干旱地区的露天煤矿废弃物土壤水文过程中,优先流起着关键作用。接种丛枝菌根(AM)真菌可显著影响植被根系的生长,改善土壤物理结构。然而,人们对废料新区优先流的影响仍然知之甚少。本文分析了接种AM真菌对中国黑岱沟露天煤矿废弃区内根系空间分布和优先流动的影响。研究采用了染色示踪法和网格取样法。在新形成的废料区,优先流道的发展主要受蕨类植物根系的影响,离蕨类植物越近,优先流道越多。接种 AM 真菌 Funneliformis mosseae 能显著增加优先流的发展。在最靠近 A. fruticosa 的剖面上,染料覆盖率增加了 59%,均匀渗透深度增加了 73%,最大染色深度增加了 80%。植物根系主要分布在 0-20 厘米的土壤深度,占整个根系总长度的 80%。在最靠近 A. fruticosa 的剖面上,接种 F. mosseae 后,根的总数和根长密度增加了 32%。只有直径为 > 2 毫米的根系才有优先流动路径,而且在 0-10 厘米和 10-20 厘米的土壤深度分布更广。基质渗透主要受直径为 4 毫米的根的影响,但深层渗透更依赖于直径为 2 毫米的根。菌根菌丝促成了优先流动。接种AM真菌增加了新形成的排水点的优先流量,在干旱和半干旱地区露天煤矿废弃物的生态恢复中应考虑这种效应。
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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