Exploring the impact of new particle formation events on PM2.5 pollution during winter in the Yangtze River Delta, China

The 2014 hukou reform introduced by the Chinese central government was a turning point in China’s policies towards migration. Different from the previous hukou policies, which were largely exclusionary, the reformed policy encouraged migrants to permanently settle in their destination cities and make use of the public services available there. However, the actual results and consequences of this policy seem to vary between cities. This is due to the fact that Chinese municipal governments still have their own discretionary power when it comes to defining the criteria for accessing a local hukou. This raises the question of what the real impact of the hukou policy reform has been. This paper attempts to answer this question. It starts with a hukou access policy analysis of 20 different cities in the Yangtze River delta urban region. This analysis shows that the strictness of the local hukou access policy is related to city specific factors such as economic strength, share of migrant population, and population size. In the second part of the paper, we examine the impact of local hukou access policies on the intentions of migrants. Based on two logistic regression models, we find that the stricter the local hukou access policy is, the more willing migrants are to convert their current hukou into a local hukou. Furthermore, we observed that the settlement intention of migrants has a V-shaped rather than a linear relation with the strictness of local hukou access policies. Cities with relatively loose and cities with relatively strict hukou access policies are more desired as permanent settlement location than cities with moderately strict hukou access policies.

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The Impact of Climate Change on the Energy Consumption of Passive Residential Buildings in the Yangtze River Delta

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/783/1/012103 ◽

2021 ◽

Vol 783 (1) ◽

pp. 012103

Author(s):

Wenjuan Huang ◽

Bojun Wang ◽

Yanping Yang ◽

Shuzhao Dong

Keyword(s):

Climate Change ◽

Energy Consumption ◽

Yangtze River ◽

Residential Buildings ◽

Yangtze River Delta ◽

River Delta ◽

The Yangtze River ◽

Impact Of Climate Change ◽

The Impact ◽

The Yangtze River Delta

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Quantitative Assessment of the Impact of Human Activities on Terrestrial Net Primary Productivity in the Yangtze River Delta

Sustainability ◽

10.3390/su12041697 ◽

2020 ◽

Vol 12 (4) ◽

pp. 1697

Author(s):

Qing Huang ◽

Fangyi Zhang ◽

Qian Zhang ◽

Hui Ou ◽

Yunxiang Jin

Keyword(s):

Primary Production ◽

Human Activities ◽

Yangtze River ◽

Net Primary Production ◽

Yangtze River Delta ◽

River Delta ◽

The Yangtze River ◽

Continuous Growth ◽

The Impact ◽

The Yangtze River Delta

The continuous growth of the economy and population have promoted increasing consumption of natural resources, and raised concerns regarding the upper limits of the terrestrial ecosystems with biomass accessible for humanity. Here, human appropriation of net primary production (HANPP) was employed to assess the influence of human activities on terrestrial net primary production (NPP), and a detailed method was introduced to simulate the magnitude and trends of HANPP in the Yangtze River Delta. The results showed that the total HANPP of the Yangtze River Delta increased from 102.3 Tg C yr−1 to 142.2 Tg C yr−1, during 2005–2015, with an average of 121.3 Tg C yr−1. NPP changes induced by harvest (HANPPharv) made the dominant contribution of 79.9% to the total HANPP, and the increase of HANPPharv in cropland was the main driver of total HANPP growth, which was significantly correlated with the improvement in agricultural production conditions, such as total agricultural machinery power and effective irrigation area. The proportion of HANPP ranged from 59.3% to 72.4% of potential NPP during 2005–2015 in the Yangtze River Delta, and distinguishable differences in the proportions were found among the four provinces in the Yangtze River Delta. Shanghai had the largest proportion of 84.3%, while Zhejiang had the lowest proportion of 32.0%.

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