Carbon, nitrogen, and phosphorus variation along a green roof chronosequence: Implications for green roof ecosystem development

Abstract This study examined the effects of two substrates (SOIL and COMMERCIAL) and grass on the green roof runoff quality in Singapore. Ten events were sampled over a 9-month period. Rainfall and green roof runoff from grass and bare experimental configurations were tested for total organic carbon (TOC), nitrogen and phosphorus nutrients (N, NH4+-N and PO43−-P), cations/anions and trace metals (Fe, Cu, Zn, Cd and Pb). All configuration units neutralised acid rainfall and removed metals except Fe despite their proximity to an industrial area. Concentrations decrease over the monitoring period for most water quality variables. The COMMERCIAL (COM) configurations elevated Cl− (3.8–10.8 ppm), SO42− (1.5–32.4 ppm), NO3−-N (7.8–75.6 ppm) and NH4+-N (22.0–53.1 ppm) concentrations in the runoff. Concentrations of NO3−-N (4.5–67.7 ppm) and NH4+-N (14.7–53.0 ppm) remained high at the end of the monitoring period for the COMgrass configuration, even with dilution from monsoon rainfall, making it suitable as an irrigation water source and a fertiliser substitute. The SOIL substrate retained N-nutrients, TOC and trace metals with concentrations comparable or below rainfall inputs. This substrate is suitable for widespread green roof applications in Singapore and other tropical cities. We recommend substrate testing before their approval for use on green roofs and encourage the long-term monitoring of these systems.

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Nutrient leaching from extensive green roofs with different substrate compositions: a laboratory study

Water Science & Technology ◽

10.2166/wst.2017.622 ◽

2017 ◽

Vol 77 (4) ◽

pp. 1007-1014 ◽

Cited By ~ 2

Author(s):

Wei Zhang ◽

Xing Zhong ◽

Wu Che

Keyword(s):

Peat Soil ◽

Green Roof ◽

Green Roofs ◽

Nutrient Leaching ◽

Nitrogen And Phosphorus ◽

Cumulative Emission ◽

Term Operation ◽

Artificial Rainfall ◽

The Difference ◽

Extensive Green Roofs

Abstract To investigate nutrient leaching from extensive green roofs, green roof platforms were established to investigate the effluent quantity and quality during artificial rainfall. When the influent volume reached three times the empty bed volume, for which the cumulative rainfall was around 300 mm, the effluent TP and COD concentrations of green roof platforms filled with peat soil did not tend to stabilize. For a long-term operation, the substrate depths had little significant influence on TN, TP and COD concentrations of the green roof effluents. A normalized cumulative emission process method was proposed to discuss the difference in various pollutant leaching processes. Obvious differences in the leaching process of different contaminants for green roof platforms filled with various substrates were observed. For the green roof filled with modified substrates, the nitrogen and phosphorus pollutant leaching rates were relatively high in the initial stage of green roof operation and the phosphorus leaching rate was higher than that of nitrogen. The green roof is a sink for TN, but not for TP and COD in this study. The outcomes are critical for the selection of green roof substrates and also contribute to green roof maintenance.

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Nitrogen and Phosphorus Limitation over Long-Term Ecosystem Development in Terrestrial Ecosystems

PLoS ONE ◽

10.1371/journal.pone.0042045 ◽

2012 ◽

Vol 7 (8) ◽

pp. e42045 ◽

Cited By ~ 72

Author(s):

Duncan N. L. Menge ◽

Lars O. Hedin ◽

Stephen W. Pacala

Keyword(s):

Terrestrial Ecosystems ◽

Phosphorus Limitation ◽

Ecosystem Development ◽

Nitrogen And Phosphorus

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An Exploratory Study for Health Ecosystem Development for Young Adults Living Alone

Korean System Dynamics Review ◽

10.32588/ksds.19.4.4 ◽

2018 ◽

Vol 19 (4) ◽

pp. 83-98

Author(s):

HyeMin Byun ◽

EunKyoung Yun ◽

NamHe Choi ◽

Jisun Choi ◽

Juhee Kim ◽

...

Keyword(s):

Young Adults ◽

Exploratory Study ◽

Living Alone ◽

Ecosystem Development

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Influence of increased nutrient supply on Microcystis aeruginosa at cellular and proteomic levels

Aquatic Microbial Ecology ◽

10.3354/ame01939 ◽

2020 ◽

Vol 85 ◽

pp. 47-58

Author(s):

Y Jiang ◽

Y Liu

Keyword(s):

Microcystis Aeruginosa ◽

Regulatory Protein ◽

Acid Synthesis ◽

Nutrient Supply ◽

Nitrogen Supply ◽

Nitrogen And Phosphorus ◽

Comprehensive Description ◽

Amino Acid Synthesis ◽

High Nutrient ◽

Proteomic Responses

Various studies have observed that increased nutrient supply promotes the growth of bloom-forming cyanobacteria, but only a limited number of studies have investigated the influence of increased nutrient supply on bloom-forming cyanobacteria at the proteomic level. We investigated the cellular and proteomic responses of Microcystis aeruginosa to elevated nitrogen and phosphorus supply. Increased supply of both nutrients significantly promoted the growth of M. aeruginosa and the synthesis of chlorophyll a, protein, and microcystins. The release of microcystins and the synthesis of polysaccharides negatively correlated with the growth of M. aeruginosa under high nutrient levels. Overexpressed proteins related to photosynthesis, and amino acid synthesis, were responsible for the stimulatory effects of increased nutrient supply in M. aeruginosa. Increased nitrogen supply directly promoted cyanobacterial growth by inducing the overexpression of the cell division regulatory protein FtsZ. NtcA, that regulates gene transcription related to both nitrogen assimilation and microcystin synthesis, was overexpressed under the high nitrogen condition, which consequently induced overexpression of 2 microcystin synthetases (McyC and McyF) and promoted microcystin synthesis. Elevated nitrogen supply induced the overexpression of proteins involved in gas vesicle organization (GvpC and GvpW), which may increase the buoyancy of M. aeruginosa. Increased phosphorus level indirectly affected growth and the synthesis of cellular substances in M. aeruginosa through the mediation of differentially expressed proteins related to carbon and phosphorus metabolism. This study provides a comprehensive description of changes in the proteome of M. aeruginosa in response to an increased supply of 2 key nutrients.

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Method application of optimal multi-parameter analysis to assess the distribution of water masses as an example of CTD data of the Barents Sea in summer 2017

Hydrosphere Еcology (Экология гидросферы) ◽

10.33624/2587-9367-2019-2(4)-38-51 ◽

2019 ◽

pp. 38-51

Author(s):

Valeriy G. Yakubenko ◽

Anna L. Chultsova

Keyword(s):

Barents Sea ◽

Field Measurements ◽

Structural Similarity ◽

Water Masses ◽

Parameter Analysis ◽

Water Dynamics ◽

Phosphorus Concentration ◽

Nitrogen And Phosphorus ◽

The Barents Sea ◽

Expert Assessments

Identification of water masses in areas with complex water dynamics is a complex task, which is usually solved by the method of expert assessments. In this paper, it is proposed to use a formal procedure based on the application of the method of optimal multiparametric analysis (OMP analysis). The data of field measurements obtained in the 68th cruise of the R/V “Academician Mstislav Keldysh” in the summer of 2017 in the Barents Sea on the distribution of temperature, salinity, oxygen, silicates, nitrogen, and phosphorus concentration are used as a data for research. A comparison of the results with data on the distribution of water masses in literature based on expert assessments (Oziel et al., 2017), allows us to conclude about their close structural similarity. Some differences are related to spatial and temporal shifts of measurements. This indicates the feasibility of using the OMP analysis technique in oceanological studies to obtain quantitative data on the spatial distribution of different water masses.

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