Fine-Root Distribution and Soil Physicochemical Property Variations in Four Contrasting Urban Land-Use Types in South...

Area of Science:

• Urban Ecology
• Soil Science
• Ecosystem Function

Background:

• Urbanization transforms native forests into diverse land-use types, including grasslands and agroecosystems.
• The effects of these land-use changes on soil properties and fine-root dynamics, critical for ecosystem functioning, remain poorly understood.

Purpose of the Study:

• To investigate how different urban land-use types influence soil physicochemical properties and fine-root mass and distribution.
• To compare these factors across four distinct urban environments: grassland (ZJ), perennial agroecosystem (MP), broadleaf deciduous forest patch (QA), and coniferous evergreen forest patch (PD).

Main Methods:

• Quantified fine-root biomass within the upper 30 cm soil profile, analyzing distribution across depth and diameter classes (<2 mm, 2-5 mm, <5 mm).
• Assessed soil physicochemical properties across the selected urban land-use types.
• Correlated fine-root mass with soil nutrient and organic matter content.

Main Results:

• Soil physicochemical properties varied significantly across land-use types, with notable differences in nutrients and cations.
• Total fine-root biomass (<5 mm) followed the order: QA > PD > ZJ > MP.
• Very fine roots (<2 mm) concentrated in the top 5 cm of soil in grasslands and forest patches, indicating distinct vertical distribution patterns influenced by land management and vegetation type.

Conclusions:

• Fine-root mass is significantly influenced by urban land-use type, with forest patches supporting greater biomass.
• Management practices in grasslands and agroecosystems correlate fine-root mass with soil nutrients, while forest litter inputs drive organic matter relationships in forest patches.
• Maintaining woody fine-root systems is vital for urban ecosystem services like soil stabilization, water infiltration, and carbon sequestration, emphasizing the need to consider fine-root dynamics in urban planning.