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Search Results: 1 - 10 of 142943 matches for " 郭再华 "
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稳定生育政策,防止人口老龄化危机——对我国农村养老保障问题的再思考
震威,
人口研究 , 2001,
Abstract: ?在稳定现行生育政策的条件下,通过政府的适度干预,我国家庭养老的优良传统将得到发扬光大,家庭养老的形式将逐步演变,家庭养老体系将继续发挥作用并足以解决农村的养老保障问题。
收入不平等与家庭借贷行为*——家庭为追求社会地位而借贷的动机真的存在吗
INCOME INEQUALITY AND HOUSEHOLD BORROWING——Does the Motivation of Household Borrowing for Social Status Exist

新华,刘辉,
- , 2016,
Abstract: 摘要 本文利用中国家庭金融调查(CHFS)2011年度的调查数据,考察了收入不平等对家庭借贷行为的影响,并验证了家庭是否存在为追求社会地位而借贷的动机。研究表明:(1)收入不平等并不是影响家庭是否借贷的主要因素,但是对家庭的负债规模存在十分显著的抑制作用;(2)收入不平等的扩大并不会促使中低收入家庭寻求借贷或提升家庭负债规模,我国家庭并不存在为了追求更高的社会地位而进行借贷的动机;(3)收入不平等的扩大有利于高收入家庭获得更多的正规金融借贷,中低收入家庭则会较多地依赖于非正规金融借贷;(4)户主的人口统计学特征、家庭经济特征以及家庭所处地区特征均是影响家庭借贷行为的重要因素,在正规金融和非正规金融市场上,影响家庭借贷行为的因素存在较明显的差异。
Abstract: Using the data of 2011 China Household Finance Survey (CHFS), this paper investigates the effect of income inequality on household debt and verifies the existence of households motivation borrowing for social status in ChinaOur research results show as follows:(1) Income inequality is not a major factor whether the household to borrow or not, but it can cause the inhibition of the scale in debt(2)The broaden of income inequality does not make lowincome families attempt to seek loans or enhance the size of household debtChinese family has no motives for pursuing a higher social status to borrow(3) The broaden of income inequality benefits the highincome families to get more formal financial borrowingLowincome families will be more dependent on the informal financial borrowing(4) The demographic characteristics of the head of household, economic characteristics of households and their locations are the important factors that affect household borrowing behavior, and there are more obvious differences between factors that influence the formal finance and informal finance borrowing.
财富不平等会抑制金融素养对家庭借贷行为的作用效果吗*——基于CHFS数据的经验分析
WILL WEALTH INEQUALITY RESTRAIN THE EFFECT OF FINANCIAL LITERACY ON HOUSEHOLD BORROWING ——Evidence from CHFS Data

,叶菁菁,新华
- , 2017,
Abstract: 摘要 本文基于2013年中国家庭金融调查(CHFS)数据,选用工具变量法,考察了金融素养对城乡家庭借贷行为影响的差异性,并验证了财富不平等扩大会抑制金融素养对家庭借贷行为的影响。研究发现:(1)金融素养是影响家庭借贷行为的重要因素。户主金融素养水平的改善显著提高了家庭发生借贷的概率与家庭借贷规模。(2)金融素养对城乡家庭借贷行为的影响存在明显差异,金融素养的提高对信贷约束较为严重的农村家庭借贷行为的促进作用更大。(3)财富不平等对家庭借贷行为存在明显的抑制作用,财富不平等的扩大减少了家庭借贷需求,降低了家庭发生借贷的概率和家庭负债规模。(4)随着家庭财富不平等程度的扩大,金融素养对家庭借贷行为的促进作用受到抑制。基于以上结论,政府应该大力开展消费者金融素养教育,注重家庭收入分配合理性,从而推动我国消费金融市场的健康发展。
Abstract: Based on China Household Financial Survey data in 2013, this paper examines the urbanrural differential effect of financial literacy on household borrowing in China, and also verifies that the expanding of wealth inequality will restrain the effect of financial literacy on household borrowing by choosing Instrumental Variable. Our research results show as follows. First, financial literacy is a major factor affecting household borrowing. The improvement of householders financial literacy dramatically increases not only the probability of household borrowing but also the scale of debt. Second, the effects of financial literacy on household borrowing of urban areas is significantly different from rural areas, and this effect is greater on rural households while face more severe credit constraints. Third, wealth inequality has significantly inhibitory effect on household borrowing. The expansion of wealth inequality will reduce the households credit demand, and reduce the probability of household borrowing and debt scales. Fourth, with the expanding of household wealth inequality, it reduces the positive impact of financial literacy on household borrowing. According to the conclusions that mentioned above, the government should vigorously develop consumer financial literacy education, and pay attention to the rationality of family income distribution, which promote the healthy development of consumer financial market in China.
水稻耐低磷特性研究
,贺立源,徐才国
应用与环境生物学报 , 2004,
Abstract: 摘要选取3个耐低磷水稻基因型99011、580、99112和1个磷敏感基因型99056为供试材料,采用营养液和石英砂培养的方法,研究了与磷效率相关的一些指标.结果表明,99011和580均具有较高的磷吸收效率和利用效率.其中根长是99011高效吸收的重要贡献因子,其次它对难溶性磷有一定的活化吸收能力;580不仅对难溶性磷的活化吸收能力最强,而且善于从低浓度的磷环境中吸收较多的磷;而99112主要靠被动适应生态环境来表现它的耐低磷特性.与磷吸收效率相关的次级因子表现不佳,是99056对低磷反应敏感的主要原因.图3表4参16
磷、砷双重胁迫对不同耐低磷水稻苗期生长及磷、砷吸收的影响
,孟萌,侯彦琳
应用与环境生物学报 , 2009, DOI: 10.3724/SP.J.1145.2009.00596
Abstract: 以1个耐低磷和1个低磷敏感水稻为材料,通过土培试验研究磷、砷双重胁迫对水稻苗期生物学特性及磷、砷吸收的影响,并比较不同品种之间的差异.结果表明,相同磷水平下,外加砷浓度为小于25mg/kg时,水稻的生物量、叶宽、株高、spad值及磷吸收量均随砷浓度的增加而增加,当砷浓度达到50mg/kg时开始下降,两个品种表现相同趋势.说明少量砷可以刺激水稻生长,促进磷的吸收,砷用量过多则抑制水稻的生长及磷的吸收.相同砷水平下,水稻生物学性状及磷、砷吸收量随磷用量的增加而增加,两个品种亦表现相同趋势.说明适当施磷肥可以缓解砷对水稻生长的抑制作用.上述结果表明,低浓度的磷、砷具有协同效应,高浓度的磷、砷表现拮抗作用.此外,相同磷、砷水平下,供试耐低磷水稻的生物学性状及其相对值较低磷敏感水稻大;但相对磷吸收量(除磷处理为150mg/kg外)比低磷敏感水稻小,而砷吸收量及其相对值均比低磷敏感水稻多,这可能与二者的磷营养特性及水稻对磷和砷的竞争吸收有关.图7表1参19
磷水平对不同耐低磷水稻苗根系生长及氮、磷、钾吸收的影响
,贺立源,徐才国
应用与环境生物学报 , 2006,
Abstract: 摘要选取3个耐低磷水稻基因型99011、580和99112及1个磷敏感基因型99056为材料.采用营养液培养,比较了它们在不同磷水平下苗期根系的生长状况及对氮、磷、钾的吸收情况.结果表明,耐低磷基因型适应低磷的能力较强,它们具有较长的根系、较大的根体积和根干重,其中99011和580表现尤为突出,且它们的根系受磷水平变化的影响明显小于敏感基因型99056;0.081~0.161mmol/l的磷处理更有利于耐低磷基因型根系的发育,并且促进氮和钾的吸收,此时,植株能够吸收较正常磷处理更多的氮和钾;而磷敏感基因型99056吸收氮和钾的量随供磷水平的下降而减少,并且吸收磷的总量受磷水平变化的影响显著较3个耐低磷基因型大.图1表5参15
酸胁迫对不同基因型玉米生长和钙镁养分吸收的影响
章爱群,贺立源,李德,,张丽梅
应用与环境生物学报 , 2007,
Abstract: 摘要采用盆栽试验系统研究了不同耐酸特性的4个玉米自交系苗期、拔节期和散粉期的生长状况和钙、镁营养特性.结果表明,铝毒对玉米生长发育的影响贯穿于全生育期,但是影响强度随时间推移而减轻.在苗期,铝毒严重影响玉米对钙、镁营养的吸收,且对钙吸收的影响大于镁,不同基因型间存在明显差异.与酸敏感自交系相比,耐酸自交系苗期可保持较高的钙、镁浓度,地上部钙、镁耐酸指数显著高于酸敏感自交系.苗期之后,玉米钙、镁营养受酸胁迫的影响相对较小,除散粉期耐酸自交系功能叶中钙镁比表现较稳定外,其它钙镁营养特性没有表现出明显规律.图1表5参14
Effect of organic acids on inorganic phosphorus transformation in soils and its readily available phosphate
有机酸对土壤无机态磷转化和速效磷的影响

章爱群,贺立源,赵会娥,,崔雪梅
生态学报 , 2009,
Abstract: Low of available phosphorous is one of the major limitations to crop production. Mobilization of insoluble phosphates by root exudates plays an important role in improving P nutrition of crops. Three types of soils collected from Hubei province were tested to analyze the changes of inorganic phosphorus fractions and available phosphorous after incubated with addition of various organic acids and different phosphorus sources. The results indicated that P added as fertilizer increased available phosphorous in all soils. On soils of pH4.6 and pH6.8 the fertilized phosphorus was transformed into Fe-P and Al-P mainly. However, on soil of pH8.3 the fertilized phosphorus significant increased content of Ca-P. Organic acids had significant influence on available phosphorous except malic acid. Application of organic acids decreased the content of Al-P and increased the content of Ca-P in neutral soil, in the order of Oxalic acid > Citric acid > Malic acid. Phosphorus was activated by organic acid mostly from the fractions of Al-P and Fe-P in acid soil and neutral soil, but fractions of Ca-P in alkali soil, at the same time, organic acid accelerated formation and accumulation of O-P in the three soils.
耐低磷水稻筛选与鉴定
,贺立源,黄魏,徐才国
植物营养与肥料学报 , 2006, DOI: 10.11674/zwyf.2006.0507
Abstract: 对2472个来自不同核心种质资源库的代表性水稻品种进行了苗期耐低磷初选和复筛,并通过全生育期鉴定,研究了耐低磷水稻种质资源筛选的基本条件和指标。结果表明,采用两步筛选法,即苗期初筛和复筛,并通过全生育期产量验证,既可以获得典型耐低磷和低磷敏感水稻品种,又提高效率,吻合度达67%;在供试土壤有效磷含量小于5.mg/kg时,筛选密度为4株/600g土,设低磷水平为50.mg/kg(外加);分蘖数及其耐低磷指数(相对分蘖数)综合性较强,作为苗期筛选指标比较适宜;对于少数特殊的品种,它们在高磷和低磷处理时都没有分蘖,此时用干重耐低磷指数(相对干重)来衡量它们的耐低磷能力比较合适;全生育期验证以经济产量及其耐低磷指数(相对经济产量)为鉴定指标,其中有效穗对经济产量影响最大。
缺磷对不同耐低磷玉米基因型酸性磷酸酶活性的影响
张丽梅, , 张琳, 贺立源
植物营养与肥料学报 , 2015, DOI: 10.11674/zwyf.2015.0408
Abstract: 【目的】酸性磷酸酶活性与土壤及植株体内有机磷的分解和再利用有着密切的关系。本研究以不同耐低磷玉米自交系为材料,研究低磷胁迫下玉米叶片、根组织内以及根系分泌酸性磷酸酶活性的变化及基因型差异,探讨酸性磷酸酶与玉米耐低磷之间的关系,以期更深入地了解玉米耐低磷的生理机制。【方法】以5个典型耐低磷自交系99180T、99239T、99186T、99327T、99184T和2个磷敏感自交系99152S、99270S为试验材料,采用营养液培养方法,设正常磷和低磷两种处理,分别于缺磷处理3、8和12d时调查取样,测定地上部干重、根干重、叶片中无机磷(Pi)含量、根和地上部磷累积量、根系分泌APase活性以及叶片中APase活性,并于缺磷处理12d测定根系内APase活性。【结果】1)缺磷使玉米地上部干重下降,根干重、根冠比增加,随着缺磷处理(3d→8d→12d)时间的延长,根干重、根冠比增加幅度增大,且耐低磷自交系根干重增加幅度普遍大于敏感自交系。2)低磷条件下,玉米自交系磷吸收、利用效率存在基因型差异,耐低磷自交系99239T、99180T和99327T磷吸收效率较高,99186T和99184T磷利用效率高,敏感自交系99152S、99270S磷吸收和利用效率均较低。3)低磷处理使玉米自交系叶片无机磷(Pi)含量显著下降,耐低磷自交系99184T、99327T和99239T下降幅度较小,相对叶片无机磷含量较高。4)缺磷诱导玉米根系分泌的APase活性升高。耐低磷自交系99184T和99186T根系分泌APase活性升高幅度较大,其余3个耐低磷自交系未表现出明显优势。缺磷处理3d、8d,玉米根系分泌APase活性与磷累积量显著正相关,而12d时相关性不显著;根系分泌APase活性与磷利用效率在缺磷处理12d时达显著正相关。说明玉米根系分泌APase活性与磷吸收、利用效率相关关系不稳定。5)缺磷处理12d,各玉米自交系根组织内APase活性与根系分泌APase活性变化情况较一致,两者相关系数r=0.755(P<0.05)。6)缺磷条件下各玉米自交系叶片组织内APase活性均有升高趋势,并表现出明显的基因型差异。缺磷处理8d,耐低磷自交系99184T和99239T叶片组织内APase活性升高幅度最大,其次是99327T和99186T,99180T、99270S和99152S升高幅度较小;缺磷处理12d,各玉米自交系叶片APase活性仍继续增加,99239T、99184T、99327T和99186T的相对APase活性均较高,99270S和99152S的相对APase活性较低。相关性分析表明,缺磷条件下玉米自交系叶片中相对APase活性与叶片中相对无机磷(Pi)含量显著正相关,与磷吸收、利用效率不显著相关。【结论】低磷诱导玉米叶片、根组织和根系分泌APase活性升高,根组织和根系分泌APase活性的大小与玉米耐低磷能力不完全相关,叶片APase活性与玉米耐低磷能力有较好的一致性。
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