Scholarlink

<p>Mollisols of the Eurasian steppe belt are highly productive soils whose hydraulic functioning depends on aggregate hierarchy and management-induced structural dynamics. This study compared the hydro-structural properties of two pedogenic endmembers: the Chinese Isohumusol (monsoon-influenced) and the Ukrainian Chernozem (continental-influenced). Field experiments quantified aggregate size distribution, aggregate stability indices (Mean Weight Diameter, MWD; Geometric Mean Diameter, GMD), bulk density, and seasonal infiltration dynamics to evaluate hydro-structural resilience under contrasting tillage. The Isohumusol exhibited a coarse, depth-stratified architecture with a high proportion of very coarse &gt; 10&#xa0;mm aggregates and high surface stability under No-Till (MWD = 2.84), supporting peak initial infiltration rates (&gt; 700&#xa0;mm&#xa0;h⁻<sup>1</sup>). However, this structure was susceptible to seasonal densification with surface bulk density increasing by 16% from spring to summer and significant degradation under conventional tillage. In contrast, the Chernozem displayed a more homogeneous structure dominated by stable 2–10&#xa0;mm aggregates, maintaining high stability across the profile (MWD up to 3.01). Its matrix-dominated pore system resulted in lower infiltration rates (&lt; 600&#xa0;mm&#xa0;h⁻<sup>1</sup>) but greater resistance to structural collapse, as reflected by a stable fractal dimension (D ≈ 2.47). Reduced tillage systems in the Chernozem increased subsoil bulk density (&gt; 1.35&#xa0;g&#xa0;cm⁻<sup>3</sup>), signaling compaction risks. These findings demonstrate that infiltration dynamics and structural stability are fundamentally governed by soil-specific pedogenic templates and seasonal abiotic drivers, necessitating regionally tailored conservation tillage strategies.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Pedogenic and climatic controls on tillage-induced hydro-structural dynamics in eurasian mollisols

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月29日

查看全文
  • Yuriy Kravchenko,
  • Xingyi Zhang

摘要

Mollisols of the Eurasian steppe belt are highly productive soils whose hydraulic functioning depends on aggregate hierarchy and management-induced structural dynamics. This study compared the hydro-structural properties of two pedogenic endmembers: the Chinese Isohumusol (monsoon-influenced) and the Ukrainian Chernozem (continental-influenced). Field experiments quantified aggregate size distribution, aggregate stability indices (Mean Weight Diameter, MWD; Geometric Mean Diameter, GMD), bulk density, and seasonal infiltration dynamics to evaluate hydro-structural resilience under contrasting tillage. The Isohumusol exhibited a coarse, depth-stratified architecture with a high proportion of very coarse > 10 mm aggregates and high surface stability under No-Till (MWD = 2.84), supporting peak initial infiltration rates (> 700 mm h⁻1). However, this structure was susceptible to seasonal densification with surface bulk density increasing by 16% from spring to summer and significant degradation under conventional tillage. In contrast, the Chernozem displayed a more homogeneous structure dominated by stable 2–10 mm aggregates, maintaining high stability across the profile (MWD up to 3.01). Its matrix-dominated pore system resulted in lower infiltration rates (< 600 mm h⁻1) but greater resistance to structural collapse, as reflected by a stable fractal dimension (D ≈ 2.47). Reduced tillage systems in the Chernozem increased subsoil bulk density (> 1.35 g cm⁻3), signaling compaction risks. These findings demonstrate that infiltration dynamics and structural stability are fundamentally governed by soil-specific pedogenic templates and seasonal abiotic drivers, necessitating regionally tailored conservation tillage strategies.