| 1. |
- Wang, Yidi, et al.
(författare)
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Higher Fine Particle Fraction in Sediment Increased Phosphorus Flux to Estuary in Restored Yellow River Basin
- 2021
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Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 55:10, s. 6783-6790
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Tidskriftsartikel (refereegranskat)abstract
- River delta-front estuaries (DEs) are vital interfaces for fluxes between terrestrial and marine environments. However, deep uncertainty exists in estimating the sedimentary pollutant flux from terrestrial environments in DEs due, in part, to a lack of direct measurements in these dynamic and complicated regions and uncertainty in the calculation method. Due to its high sediment content, the Yellow River (YR) has a strong ability to adsorb phosphorus; therefore, it reliably reflects estuarine sedimentary processes. Here, through the comprehensive analysis of field samples, monitoring data and remote sensing images, we conclude that riverine fine particles control the deltaic estuary pollution status and that particle size is the key factor. Based on the stable relationships between phosphorus and heavy metals, with r2 values of 0.990, 0.992, and 0.639 for As, Cd, and Cr, respectively, we estimated that the P flux reached 22.68 g/m2 yr in 2017. Analysis of the YR high-silt sediment load, which has a strong phosphorus adsorption ability and constitutes a substantial fraction of global fluvial sediment transport, revealed a negative correlation between the riverine sediment load and the estuarine phosphorus flux.
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| 2. |
- Fan, Ying, et al.
(författare)
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Offspring’s Uncertainty and Dynastic Decisions: Evidence from Urban China
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- We investigate the impact of offspring’s income uncertainty associated with college enrollment on intergenerational decisions. We exploit the experiment of the national college entrance examination (NCEE) reform in China, which increases the uncertainty of households containing students of compulsory education age. Based on comprehensive survey data, we find that 1) offspring’s uncertainty arising from the NCEE reform significantly decreases household total consumption and shifts consumption structures toward intergenerational inputs and housing purchases; 2) additional housing demand can be attributed to a dynastic precautionary motivation, which has heterogeneous effects based on a status quo bias toward exposure to and perception of the reform; 3) the inclusion of illiquid housing assets tilts the portfolio of households toward safe and liquid financial assets, and this allocation adjustment makes households financially worse off.
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| 3. |
- Liu, Lianhua, et al.
(författare)
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Heavy metal accumulation, geochemical fractions, and loadings in two agricultural watersheds with distinct climate conditions
- 2020
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Ingår i: Journal of Hazardous Materials. - : Elsevier. - 0304-3894 .- 1873-3336. ; 389
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Tidskriftsartikel (refereegranskat)abstract
- The main aim of this study was to explore the effects of climate conditions on the transport and transformation of heavy metals. Sedimentary geochemical analysis and watershed modeling were used to investigate the distinctions between heavy metal pollution under different climate conditions. The results showed that the average concentrations of Cu, Cd, and Pb in sediments of the subtropical watershed (36.64, 0.60, and 133.69 mg/kg, respectively) were higher than those of the temperate watershed (26.58, 0.19, and 23.17 mg/kg, respectively) because of surface runoff-induced heavy metal loadings under higher precipitation. Also, the labile fractions, which mainly originated from anthropogenic sources, showed higher percentages in the subtropical watershed (67.84-91.33%), thereby indicating that the transport of heavy metals was promoted by surface runoff. Moreover, higher percentages of acid-soluble fractions of Cu and Pb (23.55-33.60%) in the subtropical watershed suggested that higher temperatures accelerated the transformation of heavy metal fractions, thus contributing to the transportation of heavy metals. Overall, climate conditions were the dominant factors for the differences between the subtropical and temperate watersheds. The results of this study suggest that the effects of climate conditions on the transport, enrichment, and bioavailability of heavy metals are of great significance. Such effects should therefore be the focus of future studies.
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| 4. |
- Wang, Yidi, et al.
(författare)
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Challenges, Experience, and Prospects of Urban Renewal in High-Density Cities : A Review for Hong Kong
- 2022
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Ingår i: Land. - : MDPI AG. - 2073-445X. ; 11:12
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Forskningsöversikt (refereegranskat)abstract
- Redevelopment in Hong Kong must be accelerated in response to urban decay and land shortages. However, due to a lack of incentives and effective policy tools under Hong Kong's floor area ratio regulations, there has been limited public-private partnerships in the urban renewal process, reducing both the public welfare and the efficiency of land use. We review the evolution of Hong Kong's density schemes for addressing urban redevelopment issues to identify the most important barriers to private sector involvement. We also summarise the international experience and identify viable policies, compare cases in Hong Kong with successful transfer of development rights (TDRs) examples, point out TDRs' shortcomings, and propose targeted policy optimisation strategies. On a practical level, this study has implications for the creation of targeted density policies to address Hong Kong's ageing infrastructure and facilitate the urban transformation of Hong Kong and similar high-density cities so that they can continue to support sustainable urban growth.
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