为明确秸秆集中掩埋还田对麦田养分淋失的影响,以期为秸秆掩埋还田提供理论依据,开展了桶栽模拟试验,试验设置了H1:麦秸20 cm埋深(5 kg m-2埋量)、H2(L1):35 cm埋深(5 kg m-2埋量)、H3:50 cm埋深(5kg m-2埋量)、L2:10 kg m-2埋量(35 cm...为明确秸秆集中掩埋还田对麦田养分淋失的影响,以期为秸秆掩埋还田提供理论依据,开展了桶栽模拟试验,试验设置了H1:麦秸20 cm埋深(5 kg m-2埋量)、H2(L1):35 cm埋深(5 kg m-2埋量)、H3:50 cm埋深(5kg m-2埋量)、L2:10 kg m-2埋量(35 cm埋深)、L3:15 kg m-2埋量(35cm埋深)及CK:麦秸不还田等6个处理,研究了秸秆不同埋深和埋量下麦田氮磷养分的淋失情况。结果表明:相同埋量条件下,秸秆不同埋深处理对麦田渗漏总量基本没有影响;相同埋深条件下,秸秆埋量为10 kg m-2和15 kg m-2时会显著增加麦季渗漏量,但埋量为5 kg m-2时则无显著影响;整个小麦生育期内,秸秆相同埋量条件下,H1对麦田氮素的拦截效果明显优于H2、H3和CK,对磷素的拦截效果则以H1为最高;相同埋深条件下,L2处理下对麦田氮素的拦截效果明显优于L1、L3和CK,L3处理下对磷素拦截效果最差。展开更多
青年群体是中等收入群体中的重要组成部分,近年来,青年人群就业成为社会热议话题,青年人群收入成为社会关注对象。文章基于CFPS目前公布的六年数据,探讨了电子商务对青年劳动人群收入的影响及其机制。研究表明,电子商务的发展增加了青...青年群体是中等收入群体中的重要组成部分,近年来,青年人群就业成为社会热议话题,青年人群收入成为社会关注对象。文章基于CFPS目前公布的六年数据,探讨了电子商务对青年劳动人群收入的影响及其机制。研究表明,电子商务的发展增加了青年群体就业机会,有利于青年劳动者增收。其机制在于,电子商务的出现通过降低就业率、促使产业结构合理化,进而提升青年群体劳动收入。异质性分析表明,男性较于女性更能抓住促收机会,东部地区电子商务经济增收效应更加明显,流动人口在电子商务经济环境中更易于提高收入。The young population is an important part of the middle-income group. In recent years, the employment of young people has become a hot topic in society, and their income has become a subject of public concern. Based on the currently available six years of data from the China Family Panel Studies (CFPS), this article explores the impact of e-commerce on the income of young laborers and its mechanisms. The study shows that the development of e-commerce has increased employment opportunities for young people and helped them increase their income. The mechanism lies in that the emergence of e-commerce has lowered the employment rate, promoted the rationalization of the industrial structure, and ultimately raised the income of young laborers. The heterogeneity analysis shows that men are more likely to seize the opportunity to increase their income than women, and the e-commerce economic income-increasing effect is more obvious in the eastern region. Migrant workers are more likely to increase their income in the e-commerce economic environment.展开更多
文摘为明确秸秆集中掩埋还田对麦田养分淋失的影响,以期为秸秆掩埋还田提供理论依据,开展了桶栽模拟试验,试验设置了H1:麦秸20 cm埋深(5 kg m-2埋量)、H2(L1):35 cm埋深(5 kg m-2埋量)、H3:50 cm埋深(5kg m-2埋量)、L2:10 kg m-2埋量(35 cm埋深)、L3:15 kg m-2埋量(35cm埋深)及CK:麦秸不还田等6个处理,研究了秸秆不同埋深和埋量下麦田氮磷养分的淋失情况。结果表明:相同埋量条件下,秸秆不同埋深处理对麦田渗漏总量基本没有影响;相同埋深条件下,秸秆埋量为10 kg m-2和15 kg m-2时会显著增加麦季渗漏量,但埋量为5 kg m-2时则无显著影响;整个小麦生育期内,秸秆相同埋量条件下,H1对麦田氮素的拦截效果明显优于H2、H3和CK,对磷素的拦截效果则以H1为最高;相同埋深条件下,L2处理下对麦田氮素的拦截效果明显优于L1、L3和CK,L3处理下对磷素拦截效果最差。
文摘青年群体是中等收入群体中的重要组成部分,近年来,青年人群就业成为社会热议话题,青年人群收入成为社会关注对象。文章基于CFPS目前公布的六年数据,探讨了电子商务对青年劳动人群收入的影响及其机制。研究表明,电子商务的发展增加了青年群体就业机会,有利于青年劳动者增收。其机制在于,电子商务的出现通过降低就业率、促使产业结构合理化,进而提升青年群体劳动收入。异质性分析表明,男性较于女性更能抓住促收机会,东部地区电子商务经济增收效应更加明显,流动人口在电子商务经济环境中更易于提高收入。The young population is an important part of the middle-income group. In recent years, the employment of young people has become a hot topic in society, and their income has become a subject of public concern. Based on the currently available six years of data from the China Family Panel Studies (CFPS), this article explores the impact of e-commerce on the income of young laborers and its mechanisms. The study shows that the development of e-commerce has increased employment opportunities for young people and helped them increase their income. The mechanism lies in that the emergence of e-commerce has lowered the employment rate, promoted the rationalization of the industrial structure, and ultimately raised the income of young laborers. The heterogeneity analysis shows that men are more likely to seize the opportunity to increase their income than women, and the e-commerce economic income-increasing effect is more obvious in the eastern region. Migrant workers are more likely to increase their income in the e-commerce economic environment.
