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Journal of Integrative Agriculture 2014年第7期13卷 1418-1431页

作者： kevin z.chen Claire Hsu International Food Policy Research Institute-Beijing Office

Climate change poses a serious threat to the future food security of China, which is among the most disaster-prone countries in the world. This paper discusses the implications of climate change for China＇s agricultural sector. Its main objectives are to identify the agricultural risks associated with climate change, to introduce a conceptual framework for agricultural climate risk management and to enumerate key adaptation strategies, challenges, and recommendations.

关键词： climate change food security risk management agricultural development

BUILDING CLIMATE-RESILIENT FOOD SYSTEMS IN EAST AND SOUTHEAST ASIA:VULNERABILITIES,RESPONSES AND FINANCING

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Frontiers of Agricultural Science and Engineering 2023年第1期10卷 16-30页

作者： Yunyi zHOU ziqi chen kevin z.chen China Academy for Rural Development and School of Public Affairs Zhejiang UniversityHangzhou 310058China International Food Policy Research Institute Washington DC 20005USA

Food system resilience to climate change is uniquely imperative for bringing Sustainable Development Goals within reach and leaving no one *** systems in East and Southeast Asia are interacting with planetary boundaries and are adversely affected by extreme weather-related events.A practical question for East and Southeast Asian stakeholders is how to foster climate-resilient food systems in the face of lingering food system vulnerabilities and policy *** paper reviews food system vulnerabilities and policy responses to climate *** the policy-based review,this paper compares the economy-wide and agriculture-specific targets of low-carbon development across East and Southeast *** China and member states of the Association of Southeast Asia Nations as case studies,multilevel policies in building and financing climate-resilient food systems are further *** findings confirm significant differences in agriculture-specific emission goals and public financing supports across East and Southeast Asian *** an objective to break practical barriers and finance climate-resilient food systems for the future,this paper recommends defining agriculture-specific greenhouse gas emission goals,reorienting the public finance scheme and enhancing mechanisms for the synergy of public and private resources.

关键词： food systems climate change East policy resilience and Southeast Asia

Factors affecting the adoption of on-farm milk safety measures in Northern China-An examination from the perspective of farm size and production type

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Journal of Integrative Agriculture 2019年第2期18卷 471-481页

作者： YANG Xin-ran kevin z.chen KONG Xiang-zhi Institute of Agricultural Economics and Development Chinese Academy of Agricultural SciencesBeijing 100081P.R.China China Academy for Rural Development Zhejiang UniversityHangzhou 310058P.R.China International Food Policy Research Institute WashingtonDC 20005USA School of Agricultural Economics and Rural Development Renmin University of ChinaBeijing 100872P.R.China

The cow stock of smallholder farmers with less than 100 cows still accounted for nearly 50% of total cows in China. Since the milk scandal occurred in 2008, raw milk safety has become focus for the sound development of the Chinese dairy industry. Adoption of on-farm milk safety measures by smallholders is a key for ensuring milk safety, and these measures are largely voluntary in nature. The recent survey conducted in northern China reveals that an overall adoption rate of various milk safety measures by smallholders is close to 48% with wide variations across the dairy farmers. We employ the Poisson regression model to study the determinants of farmers' adoption of voluntary milk safety measures. Compared with backyard dairy farmers, dairy complex and scaled dairy farms adopted more milk safety measures. Moreover, the empirical result indicates that farmers' adoption of raw milk safety measures is positively affected by farm size. These findings suggest that the changing dairy production structure towards larger farms and away from backyard dairy farming prompts smallholder dairy farmers to adopt more raw milk safety measures. This lends some support to the role of recent policy initiatives towards larger farms and away from backyard dairy farming on increasing the farmers' milk safety practices and reducing on-farm incidence of milk safety.

关键词： raw milk safety farm size production type

Elite capture,the“follow-up checks”policy,and the targeted poverty alleviation program:Evidence from rural western China

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Journal of Integrative Agriculture 2021年第4期20卷 880-890页

作者： chenG Xiao-yu WANG Jian-ying kevin z.chen Institute of Agricultural Economics and Development Chinese Academy of Agricultural SciencesBeijing 100081P.R.China School of Economics Zhejiang University of Finance&EconomicsHangzhou 310018P.R.China China Academy for Rural Development Zhejiang UniversityHangzhou 310058P.R.China International Food Policy Research Institute WashingtonD.C.20005USA

Decentralized methods for targeting poverty are widely adopted in developing countries to improve the performance of various poverty alleviation programs.A common challenge for implementing successful decentralized targeting is the existence of elite *** has recently implemented a nationwide decentralized poverty targeting program,the targeted poverty alleviation(TPA)policy,to achieve the national goal of eliminating absolute poverty by the end of *** the largest decentralized poverty targeting program in the world,TPA's successful implementation was believed to be threatened by elite capture in some earlier *** 2015,a targeting correction mechanism,called"follow-up checks"policy,has been *** the"follow-up checks"policy,the elites and other ineligible households who receive benefits under TPA were removed from the *** paper investigates the elite capture phenomenon in TPA using village census data from a poverty-stricken county in 2017-two years after implementing the"follow-up checks"*** find no evidence of elite capture in *** elites are unlikely to become beneficiaries or receive more benefits than *** results contradict earlier findings that reported elite capture in *** argue that the reason is the accountability emphasized by the central government in the"follow-up checks"*** findings imply that having proper accountability is critical for improving targeting performance by global antipoverty initiatives.

关键词： elite capture decentralized poverty targeting targeted poverty alleviation the"follow-up checks"policy accountability

The Impacts of COVID-19 on Migrants,Remittances,and Poverty in China:A Microsimulation Analysis

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China & World Economy 2021年第6期29卷 4-33页

作者： Yumei zhang Yue zhan Xinshen Diao kevin z.chen Sherman Robinson Institute of Agricultural Economics and Development Chinese Academy of Agricultural SciencesChina International Food Policy Research Institute(IFPRI) China China Academy for Rural Development Zhejiang UniversityChina

Chinese migrant workers are very exposed to the shocks caused by the COVID-19 *** remittances adversely affect their families who rely on remittance *** impacts of COVID-19 on migrants and remittance-receiving households are assessed using a nationally representative household dataset and a microsimulation *** found about 70 percent of migrant workers lost part of their wage income during the pandemic lockdown period and rural migrants working in small and medium enterprises were affected the *** led to about 50 percent of remittance-receiving households being affected adversely by falling remittances,and the average decline in such income was more than 45 *** 13 percent of pre-pandemic nonpoor remittance-receiving households could fall into poverty,raising the poverty rate among remittancereceiving households by 4 percentage *** households that were poor prior to the pandemic became more *** results indicate that social protection programs targeting vulnerable migrants and their families at home are important.

关键词： China COVID-19 microsimulation migrants and remittances poverty

Changing Chinese Diets to Achieve a Win-Win Solution for Health and the Environment

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China & World Economy 2021年第6期29卷 34-52页

作者： Fangfang Sheng Jingjing Wang kevin z.chen Shenggen Fan Haixiu Gao Institute of Agricultural Economics and Development Chinese Academy of Agricultural SciencesChina Academy of Global Food Economics and Policy China Agricultural UniversityChina China Academy for Rural Development Zhejiang UniversityChina International Food Policy Research Institute(IFPRI) USA

Diets are key determinants of nutrition and health and play a significant role in the *** this article,we aim to(i)describe dietary transitions and health in China and the consequent environmental challenges;(ii)identify differences between current Chinese diets and healthy reference diets;(iii)conduct a systematic review assessing the health impacts of four reference diets on the Chinese population,and(iv)simulate changes in greenhouse gas emissions under different diet *** results show differences between the Chinese diets and reference diets,with the current Chinese diet including mainly grains(especially refined rice),excessive meat consumption,and insufficient consumption of fruit and *** all Chinese consumers adopt one of the healthy reference diets all the time,the incidence of diet-related chronic disease and mortality would be significantly *** dietary shifts would also reduce greenhouse gas emissions by 146-202 million tons(18-25 percent)compared with the projected emissions level in 2030.

关键词： dietary transition healthy diets greenhouse gas emissions nutrition and health

Guest Editors’Introduction

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China & World Economy 2021年第6期29卷 1-3页

作者： Shenggen Fan kevin z.chen Dean of Academy of Global Food Economics and Policy and Chair ProfessorChina Agricultural UniversityChina China Academy for Rural Development Zhejiang UniversityChina International Food Policy Research Institute(IFPRI) USA

The unprecedented COVID-19 pandemic that began in early 2020 has severely disrupted agricultural production,food supplies,and the day-to-day life of rural residents in *** has responded to this crisis by imposing government regulations,launching fiscal support,encouraging and facilitating digital technologies,particularly e-commence,and mobilizing rural communities.

关键词： China. residents rural

Orthogonal polynomial expansions for the valuation ofoptions under the stochastic volatility models with stochastic correlation

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Journal of Management Science and Engineering 2024年第2期9卷 239-253页

作者： kevin z.Tong Department of Mathematics and Statistics University of Ottawa585 King EdwardOttawaOntarioK1N 6N5Canada

This work provides a new method for pricing options under the generalized stochastic volatility models with Jacobi stochastic *** method is based on the observation that the generalized models belong to the class of polynomial diffusions and therefore the option prices can be efficiently computed via orthogonal polynomial *** take the Heston and Schöbel-zhu models with stochastic correlation as two specific examples and are able to derive the analytical formulas for the option *** also illustrate the accuracy of the proposed method through a number of numerical experiments.

关键词： Orthogonal polynomial expansions Polynomial diffusions Stochastic correlation Jacobi process Stochastic volatility

水稻生产环节外包决策实证研究--基于江西省稻农水稻种植数据的研究

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浙江大学学报（人文社会科学版） 2018年第2期48卷 33-54页

作者：王建英黄祖辉陈志钢 [美]托马斯·里尔登金铃浙江财经大学经济学院浙江杭州310018 浙江大学中国农村发展研究院浙江杭州310058 国际食物政策研究所华盛顿20006-1002 美国密歇根州立大学农业、食品和环境经济学院密歇根州东兰辛48823 华中农业大学经济管理学院湖北武汉430070

基于江西省2011年325户稻农和2007年307户同一稻农两年各水稻种植季节内水稻种植8个生产环节的要素投入和要素来源微观数据,实证分析水稻生产环节外包决策,研究发现:不同特征的水稻生产环节间的外包程度有很大差别;不同种植规模的稻农... 详细信息

基于江西省2011年325户稻农和2007年307户同一稻农两年各水稻种植季节内水稻种植8个生产环节的要素投入和要素来源微观数据,实证分析水稻生产环节外包决策,研究发现:不同特征的水稻生产环节间的外包程度有很大差别;不同种植规模的稻农在水稻生产外包的环节上也存在差别;分析稻农水稻生产环节外包决策问题,应在季节层面而非加总的农户层面进行探索。Mvprobit模型的回归结果表明,稻农水稻生产各个环节的外包决策是相关的;对于不同特征的水稻生产环节,影响其外包的因素存在差别。总体而言,增加非农就业机会、提高非农收入水平,以及降低外包价格,均有助于外包比例的提高。

关键词：水稻生产环节外包季节层面数据 Mvprobit模型

Potential transformation of organic matter by microbes in cryoconite,Tibetan Plateau

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Science China Earth Sciences 2024年第6期67卷 1978-1989页

作者： Bixi GUO Yongqin LIU kevin Xu zHONG Quan SHI chen HE Qiang zHENG Ruanhong CAI State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Center for the Pan-Third Pole Environment Lanzhou UniversityLanzhou 730000China Department of Earth Oceanand Atmospheric SciencesUniversity of British ColumbiaVancouverBC V6T 1Z4Canada State Key Laboratory of Heavy Oil Processing Petroleum Molecules Engineering Center(PMEC)China University of PetroleumBeijing 102249China State Key Laboratory for Marine Environmental Science Collage of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Fujian Key Laboratory of Marine Carbon Sequestration Xiamen UniversityXiamen 361005China

Microorganisms play an essential role in the glacier carbon cycle;how they transform organic matter in mountain glacial cryoconite remains to be ***,we applied ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS)and deep sequencing of 16S rRNA gene,to investigate the temporal microbial transformation of dissolved organic matter(DOM)of the Tibetan Plateau *** the 60-day incubation,we found that DOM in cryoconite underwent a three-stage transformation,with decreasing bioavailability over *** microbial community did not change much in the first week while degrading DOM molecules that were associated with higher H/C_(wa)and lower O/C_(wa).During days 15-30,DOM composition remained stable while microbial diversity *** day 60,the DOM was microbially converted into a higher state of recalcitrance,with higher values of aromatic index,O/C_(wa),and lower H/C_(wa),which contained molecules containing more *** among various microbial taxa,like Cyanobacteria,Bacteroidota,Gammaproteobacteria,Firmicutes,and Actinobacteriota,drove the DOM transformation in *** study sheds light on the in-situ transformation of DOM composition meditated by microbial populations in cryoconite at a temporal scale,providing new insights into understanding the microbial roles in the glacier organic carbon transformation.

关键词： Cryoconite Dissolved organic matter Biodegradation Microbial community Temporal variation