Price fluctuation, risk hedge and choice of optimal point

Zhao, Chengzhen; Bu, Wei; Song, Ji Hyeon

doi:10.1007/s12204-016-1698-z

Cited by 3 publications

(7 citation statements)

References 1 publication

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“…This suggested that WCO 2 seemed to present an increasing trend from north to south in China. In addition, several arbor trees, such as P. stenoptera , P. acerifolia and C. camphora , showed high in QCO 2 (exceeding 400 g d −1 ) in our study, which was similar to the conclusions of Guo Hui and Zhao Yanling [ 32 , 58 ].…”

Section: Discussionsupporting

confidence: 90%

“…And wCO 2 of C. camphora (6-10 gm −2 d −1 ) in Shanghai was lower than that of S. babylonica (> 12 gm −2 d −1 ) [ 66 ]. We also observed that WCO 2 of M. grandiflora was 6.1 g.m −2 .d −1 in Zhengzhou, but it was 46.49 g.m −2 .d −1 in Shanghai’s garden plants community [ 32 ] and 174.03 gm −2 d −1 in Kunming’s road greening trees [ 29 ]. This suggested that WCO 2 seemed to present an increasing trend from north to south in China.…”

Section: Discussionmentioning

confidence: 97%

“…wCO 2 reflected the strength of plants carbon sequestration potential through their leaf photosynthesis, and for that, it was directly applied for evaluating the carbon sequestration potential of different tree species [ 53 , 66 ]. However, it seemed that QCO 2 could better represent the comprehensive level of carbon sequestration of individual plants and ecological function of urban green space, which also was considered a better scientific evaluation standard [ 32 , 58 , 62 , 65 ]. However, Zhang Na advised taking the ornamental value of trees and its QCO 2 into account at the same time [ 67 ].…”

Section: Discussionmentioning

confidence: 99%

“…Previous studied showed that Pn and Er were extremely significant correlated with wCO 2 [ 68 , 69 ], and LAI and DBH were extremely significant correlated with WCO 2 , while CD , DBH , H and LAI were extremely significant correlated with QCO 2 , respectively [ 32 ]. This was very different from the conclusion of our study, because we paid more attention to the factors that jointly affected wCO 2 , WCO 2 and QCO 2 , and found that CA , LAI and Pn could significantly affect the comprehensive carbon fixation potential of landscape tree species both in LA, SA and S.…”

Section: Discussionmentioning

confidence: 99%

“…So it was necessary to assess the carbon sequestration potential of different landscape tree species in order to maximize their carbon reduction function [ 19 , 27 ]. Besides that, most of the limited relevant studies were only on a simple assessment among some plants [ 28 – 30 ], while a systematic quantitative comparison for multifarious commonly used landscape tree species were very few [ 31 , 32 ]. Moreover, arbors, shrubs and grasses were generally jointly used to form a hierarchical landscape space in plant configuration so as to form a balanced and sustainable pattern [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive evaluation of carbon sequestration potential of landscape tree species and its influencing factors analysis: implications for urban green space management

Jin,

Zhang,

Guo

et al. 2023

Carbon Balance Manage

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Background Continuous increasing carbon dioxide (CO2) has aggravated global warming and promoted urban tree planting projects for many countries. So it’s imperative to select high carbon sequestering landscape tree species while considering their aesthetic values of urban green space. Results 32 tree species were selected as test objects which were commonly used in landscaping in Zhengzhou, a typical northern city of China. To assess the comprehensive carbon sequestration potential of landscape tree species in different plant configuration types, we simultaneously considered their daily net carbon sequestration per unit leaf area (wCO2), daily net carbon sequestration per unit land area (WCO2) and daily net carbon sequestration of the whole plant (QCO2) through cluster analysis. Besides that, we found out the key factors affecting carbon sequestration potential of landscape tree species by redundancy analysis. Conclusion Populus, P Stenoptera, P. acerifolia among large arbors (LA), V odoratissimum, P. Serratifolia, S. oblata among small arbors (SA), and B sinica var. Parvifolia, B. Megistophylla, L quihoui among shrubs (S) were recommended for local urban green space management. Photosynthetic rate (Pn), crown area (CA) and leaf area index (LAI) were the key factors which affected the comprehensive carbon sequestration potential both for LA, SA and S.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Comprehensive evaluation of carbon sequestration potential of landscape tree species and its influencing factors analysis: implications for urban green space management

Jin,

Zhang,

Guo

et al. 2023

Carbon Balance Manage

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Distribution of CO2 Concentration and Its Spatial Influencing Indices in Urban Park Green Space

Jiang

Liu

Yangshan

et al. 2023

Forests

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Park green spaces (PGSs) are an important component of urban natural carbon sinks, while their spatial morphological patterns can affect the carbon sequestration capacity themselves. This study selected six typical urban parks in the central district of Shanghai and analyzed the correlation between spatial morphological indices and CO2 concentration distribution of the PGSs based on ENVI-met and BRT models. It further explored the interaction mechanisms in the carbon cycling process of urban PGSs under the influence of different spatial morphology. The results shows that urban PGSs play the role of carbon sink in diurnal period, and the difference of CO2 concentration distribution in green space is the largest at 11 a.m. The green biomass (Gb) and arboreal area ratio (Ar) are the most important indices affecting the distribution of carbon concentration. The two indices describing spatial patterns, namely, Cohesion (Co) and canopy density (CanopyD) also significantly impact CO2 concentration. These indices have a positive impact on carbon sinks. The parkway area ratio (Pr) is a disturbing index that also has an obvious negative impact on the distribution of CO2 concentration. The moderate herbs area ratio (Hr) and open land area ratio (Or) are conducive to regulating the microclimate environment and enhancing carbon sink capacity. There is an interactive relationship between spatial indices and microclimate environment indices, as well as physical and physiological indices in the carbon sink process of green areas. The study suggested that in green space management aiming at carbon reduction, combined with the influence threshold of Gb on carbon reduction and paying attention to the importance of green amount on carbon sequestration, the vegetation density and allocation ratio should be rationally distributed to form a park green space landscape with efficient carbon fixation.

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A Simulation Study of the Impact of Urban Street Greening on the Thermal Comfort in Street Canyons on Hot and Cold Days

Liu,

Zheng,

Yang

2023

Forests

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The urban heat island effect has become a widely concerning issue worldwide. Many researchers have made great efforts to improve the summer thermal comfort of urban street canyons by optimizing street greening. Relatively less research has focused on how to improve the thermal comfort of street canyons by optimizing street greening during cold days. Many researchers have proposed strategies to improve the summer thermal comfort of street canyons using road greening. This may have a significant negative impact on the winter thermal comfort of street canyons due to the lack of consideration of the impact on hot and cold days simultaneously, especially when the road green space is mainly composed of evergreen tree species. We aimed to explore the impacts of urban street greening on thermal comfort on hot and cold days at the same time. We used Zhutang West Road in Changsha, China, as an example and built six different models to explore the impacts of the street vegetation types, number of street trees, tree heights, crown widths, and Leaf Area Index on the thermal comfort of the street canyon. In addition, we also considered the impact of different building features and wind directions on the thermal comfort of the street canyon. We employed ENVI-met (version 5.5.1) to simulate different urban street greening models. The results show that the model with a high tree canopy density, tall trees, large and dense crowns, and sufficient building shade has good thermal comfort on hot days (the average physiological equivalent temperature (PET) is 31.1 °C for the study period) and bad thermal comfort on cold days (the PET is 13.3 °C) when it is compared with the other models (the average PETs are 36.2 °C, 31.5 °C, 41.5 °C, 36.2 °C, and 35.5 °C, respectively, on hot days and for other models). In addition, the model with a very large number of short hedges has a positive impact on thermal comfort during hot days (the PET is 31.1 °C). The PET value of another comparable model which does not have hedges is 31.5 °C. Even if the model with a small building area has good ventilation, the small building shade area in the model has a more obvious impact and the model has relatively good thermal comfort during cold days (the PET is 14.2 °C) when it is compared to models with bigger building areas (the PET is 13.9 °C). In summer, when the wind is parallel to the direction of the street canyon, the wind speed in the street canyon is high and the model has relatively good thermal comfort (the PET is 35.5 °C) compared with another model which has different wind direction and lower wind speed at the street canyon (the PET is 36.2 °C). In winter, when the wind is perpendicular to the direction of the street canyon, buildings and trees have a strong windproof effect and this is beneficial to the improvement of thermal comfort (the PET is 15.3 °C for this model and 13.9 °C for another comparable model). This research lays a solid foundation and encourages people to think about the impact of building and tree composition and configuration on the thermal comfort of street canyons during hot and cold days simultaneously.

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Price fluctuation, risk hedge and choice of optimal point

Cited by 3 publications

References 1 publication

Comprehensive evaluation of carbon sequestration potential of landscape tree species and its influencing factors analysis: implications for urban green space management

Comprehensive evaluation of carbon sequestration potential of landscape tree species and its influencing factors analysis: implications for urban green space management

Distribution of CO2 Concentration and Its Spatial Influencing Indices in Urban Park Green Space

A Simulation Study of the Impact of Urban Street Greening on the Thermal Comfort in Street Canyons on Hot and Cold Days

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