Rainfall interception by Santa Monica's municipal urban forest

Effects of urban forests on rainfall interception and runoff reduction have been conceptualized, but not well quantified. In this study rainfall interception by street and park trees in Santa Monica, California is simulated. A mass and energy balance rainfall interception model is used to simulate rainfall interception processes (e.g., gross precipitation, free throughfall, canopy drip, stemflow, and evaporation). Annual rainfall interception by the 29,299 street and park trees was 193,168 m³ (6.6 m³/tree), or 1.6% of total precipitation. The annual value of avoided stormwater treatment and flood control costs associated with reduced runoff was $110,890 ($3.60/tree). Interception rate varied with tree species and sizes. Rainfall interception ranged from 15.3% (0.8 m³/tree) for a small Jacaranda mimosifolia (3.5 cm diameter at breast height) to 66.5% (20.8 m³/tree) for a mature Tristania conferta (38.1 cm). In a 25-year storm, interception by all street and park trees was 12,139.5 m³ (0.4%), each tree yielding $0.60 (0.4 m³/tree) in avoided flood control costs. Rainfall interception varied seasonally, averaging 14.8% during a 21.7 mm winter storm and 79.5% during a 20.3 mm summer storm for a large, deciduous Platanus acerifolia tree. Effects of differences in temporal precipitation patterns, tree population traits, and pruning practices on interception in Santa Monica, Modesto, and Sacramento, California are described.     

围绕品牌发展黑龙江省绿色食品产业

需求的强劲拉动和供给的有限使绿色食品产业存在广阔的发展空间,面临巨大的市场机遇。黑龙江省具有发展 绿色食品产业的客观条件和起步较早的有利基础,应该把它作为非常有潜力的经济增长点来对待。当前,要着力进行绿色食 品品牌整合,化零为整,壮大单个品牌实力,在短时期内,迅速提升品牌知名度,形成品牌效应,把绿色食品产业做大做强。     

我国农产品质量认证问题探讨

农产品质量认证被誉为进入国内外市场的通行证。从信息不对称角度出发 ,农产品质量认证的目的是将生产者的信息如实反映出来 ,并传达给消费者 ,认证时须遵循客观性、独立性、权威性、标准化和公开性原则。我国农产品质量认证在认证标准体系、质量标准认证、质量认证标志、质量标准体系方法方面存在问题 ,亟待解决     

The Role of Family Income in the Intergenerational Association of AFDC Receipt

Daughters from low‐income families who did not receive Aid to Families with Dependent Children (AFDC) are compared to daughters from low‐income families who did receive assistance to better account for family income in the intergenerational association of AFDC. The research models the timing of a daughter's first birth and, for those who become mothers, the number of years a daughter receives any AFDC. Women whose families received AFDC during their childhood are more likely to receive AFDC as adults relative to those women whose families did not receive AFDC. Controlling for family income in a more careful and comprehensive way than past research explains part but not all of the effects of childhood AFDC receipt. Among daughters from chronically poor families, however, parental AFDC use is not associated with additional years of AFDC participation. Although the present research cannot confirm or deny a causal role for parental welfare use, the intergenerational transmission of financial resources does explain part of the intergenerational association of welfare use.     

农业贸易自由化、贫困和粮食安全：印度的经验

回顾了印度独立后农业发展所经历的四个阶段，并对这期间农业政策取得的成就和存在的主要问题进行了总结。重点探讨了印度贸易自由化改革的经验及其对农业增长、贫困削减和粮食安全的影响。研究发现，农业贸易自由化改革促进了农业的发展，并使农业内部的生产结构向增加高附加值产品生产的方向转变；贫困人口和贫困发生率在不断下降；在粮食安全方面，人们的粮食物质上的可获性已经得到满足，粮食经济上的可获性也随着PDS的实施和居民收入水平的不断提高而得到了一定的改善。     

绿色带型工业城构想

我国城市空气污染与城市工业规划密切相关。因此，新建或改建中小城市的工业规划区域，决不能再走“工业污染城市”的老路，应以科学发展观和可持续发展的理念，在总结了有关城市工业污染教训的基础上，特别是吸取了天津开发区工业社会化服务中心建设的经验，按照新的规划要求，提出了工业与城市同步发展的无有害气体污染的新型绿色带型工业城的构想。     

创建绿色女子大学刍议

建设绿色女子大学、开展绿色教育,是实施可持续发展战略的必然要求,是新世纪对大学的呼唤,有着非常重要的意义.绿色大学就是将保护生态环境的活动、行为、计划、思想和观念等可持续性发展的理念贯穿到学校的各项工作中去.女子大学应该发挥自己性别特长,把绿色大学作为一种价值进行追求.本文主要从绿色女性人才、绿色产业、绿色校园三个方面论述了建设绿色女子大学的途径.     

论绿色消费方式的形成

绿色消费是可持续发展的消费方式,它的形成对人类可持续发展具有重要意义。论文主张从建立可持续发展的消费价值观,建立合理的财富分配秩序,调整经济结构和生产方式,并依靠科技进步和发挥政府的主导作用来促进绿色消费的形成。     

绿色营销与企业可持续发展

绿色营销是企业可持续发展的最终实现途径。本文揭示市场经济条件下,实施绿色营销的必然性;探讨企业的可持续发展问题的实质和解决办法;提出推行绿色营销促进企业可持续发展的对策思路。