Miscanthus × giganteus increases soil maximum water holding capacity compared to maize

IF 1.5 Q3 AGRONOMY
Jessica T. Nelson, Maoz Dor, Andy D. VanLoocke, Jacob E. Studt, Perla K. Schrock, Marshall D. McDaniel
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Abstract

Soil ecosystem services, like the ability to store water, have been depleted after a century of conventional, annual cropping, and perennial crops offer a solution to this and other agricultural environmental issues. We assessed the impact of Miscanthus × giganteus (miscanthus), a perennial biomass crop, on soil water holding capacity and structure compared to continuous maize (Zea mays L.) at two sites in Iowa. After three growing seasons, we measured the following: (1) maximum water holding capacity (MWHC) with and without soil structure, and (2) total porosity and pore size distribution (PSD) via micro-computed tomography (microCT). Miscanthus increased MWHC by 14.7% across both sites relative to maize (p = 0.002), and we attributed this to structural changes due to the lack of a crop effect when measured on structureless soils. No significant changes were detected in soil organic matter, texture, total porosity, or PSD that could explain the increase in MWHC under miscanthus. Our findings suggest that the increases in MWHC are primarily due to structural changes rather than increases in soil organic matter or porosity (at least porosity detectable by microCT). This study highlights miscanthus' potential to enhance soil water storage and underscores the need for further investigation to clarify the mechanisms through which this biomass crop influences soil structural properties.

Abstract Image

与玉米相比,芒草增加了土壤的最大持水量
土壤生态系统的功能,如储水能力,在经过一个世纪的传统一年生种植后已经枯竭,而多年生作物为这一问题和其他农业环境问题提供了解决方案。在爱荷华州的两个试验点,比较了多年生生物质作物Miscanthus × giganteus (Miscanthus)与连作玉米(Zea mays L.)对土壤持水能力和结构的影响。在3个生长季节后,我们通过微计算机断层扫描(microCT)测量了:(1)有无土壤结构的最大持水量(MWHC),(2)总孔隙率和孔隙尺寸分布(PSD)。与玉米相比,芒草在两个地点的MWHC增加了14.7% (p = 0.002),我们将这归因于在无结构土壤上测量时缺乏作物效应的结构变化。在土壤有机质、质地、总孔隙度或PSD方面没有发现可以解释芒种下MWHC增加的显著变化。我们的研究结果表明,MWHC的增加主要是由于结构变化,而不是土壤有机质或孔隙度的增加(至少可以通过微ct检测到孔隙度)。该研究强调了芒草提高土壤水分储存的潜力,并强调了进一步研究阐明这种生物质作物影响土壤结构特性的机制的必要性。
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
Agrosystems, Geosciences & Environment
Agrosystems, Geosciences & Environment Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
80
审稿时长
24 weeks
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