Effects of plant roots on the regulating function of green roof runoff

Wang-Ren Zhongyuan; Zhang Shouhong; Zhang Sunxun; Yan Jing; Yang Hang; Wang Kai; Zhang Chengyu; Wei Liangyi

doi:10.12171/j.1000-1522.20220274

Journal of Beijing Forestry University > 2023 > 45(6): 108-116. > DOI: 10.12171/j.1000-1522.20220274

Wang-Ren Zhongyuan, Zhang Shouhong, Zhang Sunxun, Yan Jing, Yang Hang, Wang Kai, Zhang Chengyu, Wei Liangyi. Effects of plant roots on the regulating function of green roof runoff[J]. Journal of Beijing Forestry University, 2023, 45(6): 108-116. DOI: 10.12171/j.1000-1522.20220274

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Effects of plant roots on the regulating function of green roof runoff

1.
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
2.
Beijing Engineering Research Center of Soil and Water Conservation, Beijing 100083, China
3.
National Station for Forest Ecosystem Research in Jixian County, Jixian 042200, Shanxi, China

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Received Date: July 06, 2022
Revised Date: January 04, 2023
Available Online: May 10, 2023
Published Date: June 24, 2023

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Abstract

Abstract

Objective Green roofs have various functions of stormwater management (e.g., rainwater retention, peak discharge reduction). However, the effects of plant roots on the hydrological performance of green roofs are unclear. The objective of this study was to indicate the impact of plant roots on hydrological performance of green roofs. The results of this study were expected to provide scientific support for green roof plant configuration and management.
Method Four green roofs with different vegetation cover (Sedum lineare, Portulaca grandiflora, Sedum spectabile and a non-vegetated substrate) were set up in Beijing, and the rainfall-runoff process and water content dynamic changes of green roofs were monitored. The root characteristics such as root length density and root diameter of plants were measured and the influence of plant roots on the stormwater retention of green roofs was analyzed.
Result The stormwater retention capacity of green roof substrate with plant roots was 2.1−4.1 mm larger than that of the non-vegetated substrate. The average time of runoff generation from green roofs containing plant roots was 6−10 min earlier than the non-vegetated substrate, and the average peak present time was 9−26 min earlier than the non-vegetated substrate. When the total root length density was similar, the stormwater retention performance of the S. spectabile green roof with thick root system was better than that of the P. grandiflora with thin root system. The S. lineare had the largest total root length density and average root diameter among the other plants, and the S. lineare green roof had the least amount of the proportion of the initial loss. So as the rainfall increased, it may have a more obvious decline of stormwater retention performance than the other plants.
Conclusion Although the plant roots could increase the stormwater retention capacity of green roofs, it may advance the generation time of runoff. Meanwhile, the radial distribution of the root system also affects the runoff regulation function of green roofs.
- green roof,
- root characteristics,
- substrate,
- stormwater retention capacity,
- runoff regulating

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