绿色产业链视角下的蔗糖产业发展探析

工业化推进带来了资源衰竭、环境污染、生态破坏等不良后果．从产业链的整合提升入手,介绍了绿色产业链的内涵、特征,在分析蔗糖产业发展状况及面临问题的基础上,提出构建甘蔗制糖绿色产业链的建议．     

新疆城镇园林绿地树种配置信息系统的开发与应用

运用信息系统的原理和方法,并结合计算机技术,利用Delphi 7和Server SQL 2000数据库平台,建立一个能为新疆园林绿化服务的园林树种配置信息系统。     

昆明市无公害蔬菜生产经营消费行为调查与分析

通过对呈贡县蔬菜生产和昆明市王旗营蔬菜批发经营目标、品种选择、质量控制等情况进行了调查,综合昆明市电视台对蔬菜消费电视调查情况,以蔬菜生产者、经营者和消费者经营成本收益为视角,分析了昆明市蔬菜生产经营的行为取向及影响因素,指出无公害蔬菜产业发展的根本动力在于提高生产经营的收益成本比值,并提出相应对策。     

绿色水电评价指标体系研究

针对当前我国水电开发与生态环境的矛盾以及国内外对绿色水电的不同理解,首先提出绿色水电是将可持续发展理念引入水电建设.强调人与自然的和谐相处,实现经济与资源、环境的可持续发展的概念.其次,按照科学的原则分别构建绿色水电设计、施工、运营3个阶段的评价指标体系.最后以云南某水电工程为例进行设计阶段绿色水电评价实例分析,为我国绿色水电的实际操作提供参考.     

深圳市重型与轻型屋顶绿化降温增湿效应研究

应用比较研究法评估了重型屋顶花园与轻型屋顶绿化的降温增湿效应。观测结果表明,重型和轻型屋顶绿化在夏季均能有效地降低屋面高温、增加屋面相对湿度,且重型屋顶花园的降温增湿效应明显优于轻型屋顶绿化。为屋顶花园的发展提供参考。     

新西兰的林产品绿色政府采购政策

实施林产品绿色政府采购是国际森林保护的新兴议题, 新西兰在这方面具有代表性。文中通过对新西兰林产品绿色政府采购政策出台背景、政策内容的回顾, 对其政策目标、实施和制订方式进行了分析, 以期为我国制定相关政策提供借鉴。     

荆州市绿地系统分析与发展对策探讨

分析了荆州市绿地系统现状及存在问题,并针对荆州市的城市特点,从绿地的布局结构、高质量绿地建设和保证体系3方面,探讨了荆州市城市绿地系统建设的可持续发展之路。     

沈阳市绿色食品发展现状及应对措施研究

论述了沈阳市绿色食品发展的现状与存在的主要问题,以及发展绿色食品产业的重大意义,并根据发展绿色食品存在的主要问题,提出了对策与建议。     

Estimating N status of winter wheat using a handheld spectrometer in the North China Plain

Excessive nitrogen (N) fertilizer application is very common in the North China Plain. Diagnosis of in-season N status in crops is critical for precision N management in this area. Remote sensing, as a timely and nondestructive tool, could be an alternative to traditional plant testing for diagnosing crop N status. The objectives of this study were to determine which vegetation indices could be used to estimate N status in winter wheat (Triticum aestivum L.) under high N input conditions, develop models to predict winter wheat N uptake using spectral vegetation indices and validate the models with data from farmers’ fields. An N rate experiment and a variety-N experiment were conducted in Huimin, Shandong Province from 2005/2006 to 2006/2007 to develop the models. Positive linear relationships between simple ratio vegetation indices (red vegetation index, RVI and green vegetation index, GVI) and N uptake were observed independent of growth stages and varieties (R², 0.48–0.74). In contrast, the relationships between normalized difference vegetation indices (NDVI and GNDVI), red and green normalized difference vegetation index (RGNDI), and red and green ratio vegetation index (RGVI) were exponentially related to N uptake (R², 0.43–0.79). Subsequently, 69 farmers’ fields in four different villages were selected as datasets to validate the developed models. The results indicated that the prediction using RVI had the highest coefficient of determination (R², 0.60), the lowest root mean square error (RMSE, 39.7 kg N ha⁻¹) and relative error (RE, 30.5%) across different years, varieties and growth stages. We conclude that RVI can be used to estimate nitrogen status for winter wheat in over-fertilized farmers’ fields before heading.     

海口市城市道路绿地景观特色探析

以文献和实例结合的方式简述海口市城市道路绿地建设概况、形成历程及主要特点,探析其绿地景观特色,以期对城市道路绿地建设有所帮助。