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publications
自然资源问责审计对水污染治理效率的影响研究
Published in 重庆理工大学学报(社会科学版), 2019
作为一项重大的改革措施，领导干部自然资源资产离任审计(简称“自然资源问责审计”)在推进环境保护、资源节约方面起着十分重要的作用。文章基于2005—2017年我国271个城市的面板数据，使用双重差分模型考察自然资源问责审计与水污染治理效率之间的关系。研究表明，自然资源问责审计的实施显著提高了水污染治理效率，经过一系列稳健性检验，结果依然成立。进一步研究发现，中央环保督察是自然资源问责审计提高试点城市水污染治理效率的一种调节机制。在南方地区与水污染治理效率低的地区，自然资源问责审计发挥的作用更加显著。而动态面板数据估计方法的结果与之相吻合。因此，加强自然资源问责审计结果运用，强化地方官员水污染治理主体责任意识，实施动态的差异化政策，有助于推动我国水污染防治。
Recommended citation: 李学峰，唐洋，黄小龙. 自然资源问责审计对水污染治理效率的影响研究[J]. 重庆理工大学学报(社会科学版),2024.
Identifying hub wastewater propagation chains in China’s national economic system: A model coupled input-output analysis with graphical theory
Published in Water, 2021
Wastewater propagation chains (WPCs) measure inter-sector average propagation lengths (APL) of wastewater discharge. To achieve sustainable wastewater management, one needs to understand the propagation mechanisms by identifying WPCs at a national level over time. However, the traditional model of identifying WPCs is prone to retaining APLs with lower values but larger wastewater discharge intensities, ignoring many linkages whereby intensities are less than a preset threshold. Nevertheless, these overlooked linkages are valuable in understanding wastewater propagation mechanisms. This study proposed a new model coupled input-output analysis with the graphical theory, called the average propagation lengths-hub covariance graph (APL-HCG). This model can investigate WPCs where the closeness of sector linkages exceeds the preset thresholds. Furthermore, it is capable of retaining linkages for identifying hub wastewater propagation chains (HWPCs). Based on APL-HCG, the resultant HWPCs are decomposed as separated sub-chains which are basically composed of linkages among certain significant sectors belonging to the secondary industry or the tertiary industry. Scenario analyses show that HWPCs are effective in reducing wastewater discharge in the national economic system. The total wastewater discharge would decrease by 1.36%, 2.53%, 2.46%, and 2.11% if we reduced 10% of the final demand of all sectors in HWPCs in 2002, 2007, 2012, and 2017. The APL-HCG model outperforms WPCs obtained by the traditional Tu’s model [7] by 0.14%, 1.61%, 0.47%, and 0.10%, respectively. The APL-HCG model is 0.21%, 0.68%, 0.70%, and 0.35% better than the scenario of random sampling with the number of sectors equal to HWPCs, respectively. Certain policy implications were provided to reduce wastewater effectively at the national level.
Recommended citation: Xuefeng Li, Xiuli Liu. Identifying hub wastewater propagation chains in China’s national economic system: A model coupled input-output analysis with graphical theory[J]. Water, 2021, 13, Art. 2351(15 pages).
Regional synthetic water pollutants embodied in trade and policy simulations for mitigating pollutant discharge in China
Published in Sustainability, 2023
Inter-regional trade in commodities causes the flow of water pollutants, referred to as virtual pollutant transfer. However, existing studies usually focus on a single water pollutant and cannot characterize the integrated discharge of multiple ones. As a result, it is impossible to analyze the integrated virtual flow of multiple water pollutants among regions, much less simulate the effects of possible water pollutant reduction scenarios. To this end, we empirically synthesize several water pollutant indicators as a whole and then make it the occupancy in the framework of input–output analysis, which helps us to quantify the virtual transfer of water pollutants and simulate scenarios’ mitigating effects. The constructed indicator is called the synthetic water pollutant (SWP) discharge index. By accounting for SWP and then its virtual flows based on the compiled multi-regional input–output tables, we analyze the temporal and spatial differences in synthetic net virtual transfer of regional multiple water pollutants occurring with inter-regional trade. The results show that the national SWP discharge scale of six water pollutants (chemical oxygen demand, ammonia nitrogen, total nitrogen, total phosphorus, petroleum, and volatile phenol) is falling from 2012 to 2020. The net intake of virtual pollutants has become more concentrated. Central (e.g., Shanxi and Hunan) and western (Xinjiang, Inner Mongolia) China are the central regions of net virtual receiving. The simulation results show that reducing 10% of importing regions’ inputs while cutting 10% of exporting regions’ consumption mitigates the SWP discharge of the entire economic system by 3.45%. The decrease rate is 3.02%, increasing international imports by 10% in all regions. An incremental SWP reduction of 2.75% by reducing SWP discharge per output unit by 10% in the top 10 regions of discharge intensity indicates reducing the SWP discharge intensity is the most direct and effective approach. However, the growth of fixed asset investment in wastewater treatment and its recycling seems to contribute little to achieving China’s policy target of wastewater treatment capacity increase by 2025. This study provides regional results for managing water pollutants in China and a basis for future policymaking.
Recommended citation: Xuefeng Li. Regional synthetic water pollutants embodied in trade and policy simulations for mitigating pollutant discharge in China[J]. Sustainability, 2023, 15, Art. 10375(23 pages).
talks
Talk 1 on Relevant Topic in Your Field
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Conference Proceeding talk 3 on Relevant Topic in Your Field
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teaching
Teaching experience 1
Undergraduate course, University 1, Department, 2014
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Teaching experience 2
Workshop, University 1, Department, 2015
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