| 1. |
- Wang, Di, et al.
(författare)
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Predicting Soil Saturated Water Conductivity Using Pedo-Transfer Functions for Rocky Mountain Forests in Northern China
- 2023
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Ingår i: Forests. - 1999-4907. ; 14:6
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Tidskriftsartikel (refereegranskat)abstract
- Soil physicochemical properties and macropore spatial structure affect saturated hydraulic conductivity (Ks). However, due to regional differences and long measurement time, Ks is tedious to quantify. Therefore, it is of great importance to find simplified but robust methods to predict Ks. One possibility is to use pedo-transfer functions (PTFs). Along this line, stratified sampling was carried out in six typical forestlands in the rocky mountain area of Northern China. Penetration experiments and industrial CT scanning were combined to explore the distribution characteristics of regional Ks and its influencing factors. Based on this, we compared three Ks PTF models by multiple linear regression for Ks prediction. The results indicated that: (1) Ks decreased with increasing soil depth, which followed the order coniferous forest < broad-leaved forest < mixed forest, and the change range of mixed forest was greater than that of homogeneous forest. (2) Soil bulk density, water content, sand, silt, organic matter, total nitrogen, total phosphorus, and total potassium were significantly correlated with Ks (p < 0.05). In addition, stand type and soil depth had a certain impact on soil physicochemical properties that affected Ks. (3) Soil macropore structure, such as number density, length density, surface area density, and volume density, all decreased with increasing soil depth. They were all significantly positively correlated with Ks (p < 0.001). (4) The best predictability and universality for PTFs was achieved for PTFs containing bulk density, organic matter content, and total phosphorus. Only PTFs containing parameters of macropore spatial structure did not yield high predictability of Ks. The findings of this study contribute to the understanding of forest hydrological infiltration processes in rocky mountain forests in Northern China, and provide theoretical support for the prediction and management of water loss and soil erosion and the enhancement of water conservation functions.
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| 2. |
- Wang, Dashan, et al.
(författare)
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The Critical Effect of Subgrid-Scale Scheme on Simulating the Climate Impacts of Deforestation
- 2021
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Ingår i: Journal of Geophysical Research - Atmospheres. - : American Geophysical Union (AGU). - 2169-897X .- 2169-8996. ; 126:17
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Tidskriftsartikel (refereegranskat)abstract
- Land surface schemes (LSSs) in Earth System Models simulate how vegetation regulates land-atmosphere fluxes of heat, water, carbon, and momentum. Despite advances in the spatial resolution of regional climate modeling, significant land cover changes occured at sub-grid scale still not properly treated. Here, we investigate the response of evapotranspiration, representing the fluxes of heat and water, to deforestation in Southeast Asian Massif by employing three LSSs (Noah mosaic, Noah-MP and Community Land Model (CLM)) with different approaches in representing sub-grid variability, implemented in the Weather Research and Forecasting model. Two experiments, with and without satellite-observed deforestation, were performed for each scheme. Results show that the simulations are highly sensitive to the subgrid-scale approaches embedded in the LSSs. Compared with the observed historical climate, CLM outperforms other schemes and Noah mosaic shows the largest bias. However, if we target the simulation of the climate impacts of land cover change, the Noah mosaic scheme taking the sub-grid approach can better capture the response of evapotranspiration to deforestation. The NoahMP and CLM schemes underestimate the evapotranspiration response in the grid cells where the dominant land cover type has not changed, but overestimate the response in those grid cells with dominant type changed, which is a characteristic of dominant-grid approach. To improve our understanding of climate impacts induced by fine-scale land cover change, future efforts to better represent subgrid-scale variability and land-atmosphere flux exchange in climate models are desirable.
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| 3. |
- Kyriakopoulou, Efthymia
(författare)
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On the design of sustainable cities: Local traffic pollution and urban structure
- 2021
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Ingår i: Journal of Environmental Economics and Management. - : Elsevier BV. - 0095-0696 .- 1096-0449. ; 107
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Tidskriftsartikel (refereegranskat)abstract
- This paper investigates the impact of local traffic pollution on the formation of residential and business districts. While firms benefit from local production externalities, households commute to their workplaces with private vehicles and exert a local pollution externality on the residents living along the urban transport networks. The spatial location of firms and residents endogenously results from the trade-off between the production and pollution externalities and the commuting costs. The analysis shows that in monocentric cities the benefits associated with a fall in per-vehicle pollution are absorbed by rents paid to absentee landlords. When a city includes business and residential districts as well as a district mixing both agents, a lower per-vehicle pollution enlarges the residential districts and shifts the business districts closer to the geographical center of the city. The paper finally studies the optimal city structure. The first-best policies that fully internalize the externalities still foster business agglomeration.
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| 4. |
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| 5. |
- Reis-Andersson, Jussara, et al.
(författare)
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Networked Leadership Roles for School Leaders' Work with Schools' Digitalization : A Comparative Investigation
- 2024
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Ingår i: Proceedings of the Fourteenth International Conference on Networked Learning 2024. - Aalborg : Aalborg University Open Publishing. ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- School leaders are responsible for creating the right conditions for schools and, through dialogue, understanding schools' needs and prerequisites, distributing resources, and following up on the schools' development. School leaders are also important for supporting schools in realizing a top-down policy. One example of such policy is the digitalization policy aimed at implementing digital technologies in teaching, where strong school leaders is necessary. Thus, leadership is a crucial ingredient for a good digitalization process in schools. However, there is little written about school leaders' practice. Further, school leaders' practice may contain more networked leadership despite the fact that they often assumed a top-down leadership role, which would be especially clear when viewed through a networked learning perspective. Further, different countries have different school systems where the school leaders may be referred to by different names in their roles for supporting the schools.A common area in need of support is the digitalization of schools. Students may not get the skills they need in the future as challenges to ensure the advancement is enacted continue to broaden. Thus, it may be interesting to delve deeper into the structures of countries that may differ in general structure for school systems. In conjunction with a networked collaboration between the University of Brazil and Mid Sweden University, connections between the school systems in both countries will be made in this paper to distinguish parts of their leadership strategy for the digitalization of schools. Leadership within schools is closely connected to the pedagogical implementation of technologies. In one dimension of school leadership related to digitalization, there exists a notable aspect known as the networked dimension, which is intricately linked to assessment policies and roles associated with ICT. Given the assumption for the networked dimension, this paper is written for two primary purposes. The first purpose is to investigate the networked leadership dimension according to various leadership roles for school leaders' digitalization work. The second purpose is to prepare a comparative study of the school systems of Brazil and Sweden by reviewing literature that analyses these regions.Thus, in this short paper, we assume that school leaders' practice when compared across two countries different in size from a networked leadership perspective may comprise a research gap, indicating the relevancy of a literature review investigation of this gap.
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| 6. |
- Wang, D., et al.
(författare)
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Targeting the metabolic profile of amino acids to identify the key metabolic characteristics in cerebral palsy
- 2023
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Ingår i: Frontiers in Molecular Neuroscience. - 1662-5099. ; 16
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Tidskriftsartikel (refereegranskat)abstract
- Background: Cerebral palsy (CP) is a neurodevelopmental disorder characterized by motor impairment. In this study, we aimed to describe the characteristics of amino acids (AA) in the plasma of children with CP and identify AA that could play a potential role in the auxiliary diagnosis and treatment of CP. Methods: Using high performance liquid chromatography, we performed metabolomics analysis of AA in plasma from 62 CP children and 60 healthy controls. Univariate and multivariate analyses were then applied to characterize different AA. AA markers associated with CP were then identified by machine learning based on the Lasso regression model for the validation of intra-sample interactions. Next, we calculated a discriminant formula and generated a receiver operating characteristic (ROC) curve based on the marker combination in the discriminant diagnostic model. Results: A total of 33 AA were detected in the plasma of CP children and controls. Compared with controls, 5, 7, and 10 different AA were identified in total participants, premature infants, and full-term infants, respectively. Of these, beta-amino-isobutyric acid [p = 2.9*10(-4), Fold change (FC) = 0.76, Variable importance of protection ( VIP) = 1.75], tryptophan [p = 5.4*10(-4), FC = 0.87, VIP = 2.22], and asparagine [p = 3.6*10(-3), FC = 0.82, VIP = 1.64], were significantly lower in the three groups of CP patients than that in controls. The combination of beta-amino-isobutyric acid, tryptophan, and taurine, provided high levels of diagnostic classification and risk prediction efficacy for preterm children with an area under the curve (AUC) value of 0.8741 [95% confidence interval (CI): 0.7322-1.000]. The discriminant diagnostic formula for preterm infant with CP based on the potential marker combination was defined by p = 1/(1 + e-(8.295-0.3848* BAIBA-0.1120*Trp + 0.0108*Tau)). Conclusion: Full-spectrum analysis of amino acid metabolomics revealed a distinct profile in CP, including reductions in the levels of beta-amino-isobutyric acid, tryptophan, and taurine. Our findings shed new light on the pathogenesis and diagnosis of premature infants with CP.
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