Extensive green roof CO2 exchange and its seasonal variation quantified by eddy covariance measurements

2017 ◽  
Vol 607-608 ◽  
pp. 623-632 ◽  
Author(s):  
Jannik Heusinger ◽  
Stephan Weber
Keyword(s):  
Seasonal Variation ◽  
Eddy Covariance ◽  
Green Roof ◽  
Co2 Exchange ◽  
Extensive Green Roof ◽  
Eddy Covariance Measurements

Cross validation of open-top chamber and eddy covariance measurements of ecosystem CO2 exchange in a Florida scrub-oak ecosystem

2002 ◽  
Vol 9 (1) ◽  
pp. 84-95 ◽  
Author(s):  
Sabina Dore ◽  
Graham J. Hymus ◽  
David P. Johnson ◽  
C. R. Hinkle ◽  
Riccardo Valentini ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Cross Validation ◽  
Co2 Exchange ◽  
Open Top Chamber ◽  
Florida Scrub ◽  
Scrub Oak ◽  
Eddy Covariance Measurements ◽  
Oak Ecosystem

Eddy covariance measurements of CO2 exchange from agro-ecosystems located in subtropical (India) and boreal (Finland) climatic conditions

2020 ◽  
Vol 129 (1) ◽  
Author(s):  
Pramit Kumar Deb Burman ◽  
Narasinha J Shurpali ◽  
Subharthi Chowdhuri ◽  
Anandakumar Karipot ◽  
Supriyo Chakraborty ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Co2 Exchange ◽  
Climatic Conditions ◽  
Eddy Covariance Measurements

scholarly journals Time-Dependent Changes in the Physico-Chemical Parameters and Growth Responses of Sedum acre (L.) to Waste-Based Growing Substrates in Simulation Extensive Green Roof Experiment

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 298
Author(s):  
Anna Krawczyk ◽  
Iwona Domagała-Świątkiewicz ◽  
Agnieszka Lis-Krzyścin
Keyword(s):  
Green Roof ◽  
Matter Content ◽  
Time Dependent ◽  
First Year ◽  
Chemical Parameters ◽  
Growing Media ◽  
Extensive Green Roof ◽  
Physico Chemical ◽  
Commercial Medium ◽  
Sedum Acre

Over the last decade, an increase in the use of locally available, recycled, and waste materials as growing media components have occurred in various regions of the world in extensive green roof technology. For eco-concept reasons, such a strategy appears to be appropriate, but can be problematic due to difficulties in obtaining proper parameters of growing substrate. The growing media should be properly engineered in order to enable the proper functioning of green roofs and provide suitable environment for ideal root growth. The aim of the study was to assess the utility of locally occurring waste materials for growing media composition and estimate plant- and time-dependent changes in the physico-chemical parameters of waste-based substrates in a simulated extensive green roof system during a two-year Sedum acre L. cultivation. Five different substrate compositions were prepared using silica waste, crushed brick, Ca- and Zn-aggregates, melaphyre, tuff, sand, muck soil, urban compost, spent mushroom, and coconut fibres. Optimal water capacity, particle-size distribution, pH and salts concentration were found in all substrates. A higher concentration of macronutrients (N, P, K, Mg) and trace elements (B, Cu, Fe, Mn, Zn, Cd, Ni, Pb, and Cr) was found in waste-based substrates than in the commercial medium. In comparison to the parameters determined before establish the experiment, bulk density of tested growing media decreased, except for the substrates where the source of organic matter was the rapidly mineralising spent mushroom. The organic matter content in substrates after the two-year vegetation increased in relation to the ready-made substrate, with the exception of the composition with spent mushroom. After two years of the experiment, all available macronutrients and trace elements (with the exception of mineral N, K, SO4-S, and B) concentration were higher than in 2014, while pH, salt concentration was lower. In general, plants grown in waste substrates had lower dry matter content and higher biomass. A significantly higher biomass of S. acre L. was found in the first year of the experiment. In the second year of the research, the plants grown in the commercial medium, the substrate with silica waste, and the substrate with spent mushroom produced higher biomass than in the first year. No symptoms of abnormal growth were observed, despite the higher trace element concentrations in plants collected from waste-based substrate. Waste-based growing media can be considered as a valuable root environment for S. acre L. in an extensive green roof system.

scholarly journals Hydrologic Performance of an Extensive Green Roof under Intensive Rain Events: Results from a Rain-Chamber Simulation

2021 ◽  
Vol 13 (6) ◽  
pp. 3078
Author(s):  
Elena Giacomello ◽  
Jacopo Gaspari
Keyword(s):  
Water Retention ◽  
Green Roof ◽  
Green Roofs ◽  
International Standards ◽  
Dimensionless Number ◽  
Runoff Coefficient ◽  
Retention Performance ◽  
Extensive Green Roof ◽  
Rain Events ◽  
Hydrologic Performance

The water storage capacity of a green roof generates several benefits for the building conterminous environment. The hydrologic performance is conventionally expressed by the runoff coefficient, according to international standards and guidelines. The runoff coefficient is a dimensionless number and defines the water retention performance over a long period. At the scale of single rain events, characterized by varying intensity and duration, the reaction of the green roof is scarcely investigated. The purpose of this study is to highlight how an extensive green roof—having a supposed minimum water performance, compared to an intensive one—responds to real and repetitive rain events, simulated in a rain chamber with controlled rain and runoff data. The experiment provides, through cumulative curve graphs, the behavior of the green roof sample during four rainy days. The simulated rain events are based on a statistical study (summarized in the paper) of 25 years of rain data for a specific location in North Italy characterized by an average rain/year of 1100 mm. The results prove the active response of the substrate, although thin and mineral, and quick draining, in terms of water retention and detention during intense rain events. The study raises questions about how to better express the water performance of green roofs.

scholarly journals Preserving the variance in imputed eddy-covariance measurements: Alternative methods for defensible gap filling

2017 ◽  
Vol 232 ◽  
pp. 635-649 ◽  
Author(s):  
Sujit Kunwor ◽  
Gregory Starr ◽  
Henry W. Loescher ◽  
Christina L. Staudhammer
Keyword(s):  
Eddy Covariance ◽  
Alternative Methods ◽  
Gap Filling ◽  
Eddy Covariance Measurements

scholarly journals Global trends in air-water CO2 exchange over seagrass meadows revealed by atmospheric Eddy Covariance

2020 ◽  
Author(s):  
Bryce R Van Dam ◽  
Pierre Polsenaere ◽  
Aylin Barreras-Apodaca ◽  
Christian Lopes ◽  
Zulia Mayari Sanchez-Mejia ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Co2 Exchange ◽  
Global Trends ◽  
Seagrass Meadows
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