The Effects of Biochar on Hydrologic and Thermal Performance of Green Roof Substrate Having Water Retention Layer.

Masato Minakata; Ryusei FUKUSHIMA; Yoshiki HARADA

doi:10.7211/jjsrt.51.319

February 28, 2026Journal of the Japanese Society of Revegetation TechnologyOpen Access

The Effects of Biochar on Hydrologic and Thermal Performance of Green Roof Substrate Having Water Retention Layer.

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Key Points

To evaluate how different sizes and amounts of biochar affect the hydrologic and thermal properties of green roof substrates.
Conducted a 28-day indoor experiment using pots with substrates containing different biochar particle sizes and amounts.
Tested fine and coarse biochar at varying concentrations (0, 50, 100, 200 t/ha) in a substrate designed with a water retention layer.
Simulated summer heat island effects and heavy rain to measure water retention and cooling effectiveness.
The sample with 200 t/ha of fine biochar achieved the highest water retention capacity (44.7%) and effective moisture (35.5%).
A trend showed that water retention decreased with increasing amounts of coarse biochar.
Surface temperatures increased by 6.5 to 12.6°C with the addition of 100 to 200 t/ha of coarse biochar, while no significant change in soil temperature was observed.

Implication

This experiment demonstrates the impact of biochar on water retention and temperature in green roof substrates, suggesting improvements for urban environments.

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Cite This Study

Minakata et al. (2026) studied this question.

synapsesocial.com/papers/69d34cee9c07852e0af97399 https://doi.org/10.7211/jjsrt.51.319

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The Effects of Biochar on Hydrologic and Thermal Performance of Green Roof Substrate Having Water Retention Layer.

Key Points

Implication

Abstract

Discussion

Cite This Study

The Effects of Biochar on Hydrologic and Thermal Performance of Green Roof Substrate Having Water Retention Layer.

Key Points

Implication

Abstract

Discussion

Cite This Study

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