HESong,GONGYong-wei,XIEPeng,et al.Leaching Characteristics of Nitrogen and Phosphorus from Green Roof Growing Media Based on Soil Column Experiments[J].China Water & Wastewater,2022,38(17):125-130.
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Leaching Characteristics of Nitrogen and Phosphorus from Green Roof Growing Media Based on Soil Column Experiments

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第17期 Page: 125-130 Column: Date of publication: 2022-09-01
Author(s):
HE　Song1;  GONG　Yong-wei1;  XIE　Peng1;  CHEN　Bo2;  WANG　Wen-hai1
（1. Key Laboratory of Urban Stormwater System and Water Environment ， Beijing University of Civil Engineering and Architecture， Beijing 100044， China； 2. Beijing Tongzhou Water Authority， Beijing 101199， China）
Keywords:
green roof;  growing medium;  leaching;  nitrogen;  phosphorus
Abstract:
The leaching characteristics of nitrogen and phosphorus from seven soil columns packing with different proportions of green roof growing media were investigated by intermittent leaching method, so as to explore the influence of the proportion of green roof growing media on the stormwater runoff quality. The nitrogen and phosphorus concentrations in the leachate decreased with the increase of leaching time, and gradually tended to be stable. The leaching amounts of nitrogen and phosphorus in the first three experiments accounted for 62.8%-79.9% of the total leaching amounts. The leaching amount of TP was lower than that of TN. NO3--N was the main form of TN in the leachate, and its leaching amount was much higher than that of NH4+-N. The leaching amount of nitrogen and phosphorus from the growing media without nutrient addition were the lowest. Fine sandy loam increased the leaching amount of TP from the growing media. When the proportion of leaf rot mould or humus soil in growing media was large, the leaching amounts of nitrogen and phosphorus were high. Therefore, they were not suitable to be used as the main components of the media. On the premise of ensuring the normal growth of plants, it was recommended to use pastoral soil as the main component of the media together with appropriate amount of peat or pine needles as nutrients, and add a small amount of vermiculite or perlite that can improve the soil structure, so as to reduce the leaching amounts of nitrogen and phosphorus from growing media.
Last Update: 2022-09-01