建设项目监理计算机管理系统的建设方法

本文根据建设项目监理日常工作实际情况，阐述了建立建设项目监理计算机管理系统的建设策略和方法。     

哈大高速公路沥青混凝土面层施工质量控制

对哈大高速公路沥青混凝土路面面层施工质量控制，对包括标准、材料试验和混合料组成设计、施工技术等几个方面进行了阐述，并对其质量进行了分析和评价。     

图书馆数字资源整合探析

文章通过对目前图书馆在资源建设中存在的主要问题进行了分析，并对资源整合的现有模式、存在的难点以及对资源整合研究中的问题，应采取推进的措施进行了论述。     

树皮人造板及相关建筑材料的制备和应用

介绍了利用木质树皮制备人造板及相关建筑材料的生产工艺技术及其产品的特性,提出了木质树皮板的应用前景。     

密山至兴凯湖旅游公路冬季土方施工

本文叙述了冬季土方施工的方法、步骤和要点。     

安徽省合肥市推进美好乡村建设研究

分析了美好乡村的内涵以及建设美好乡村的必要性,指出目前的美好乡村建设缺失全面可行的规划、建设乡村的人力、农民的主体作用及美好乡村文化.在此基础上探索了推进美好乡村建设的路径问题.     

Land Equivalent Ratio of Groundnut-Fingermillet Intercrops as Affected by Plant Combination Ratio,and Nitrogen and Water Availability

Abstract

Field experiments were conducted to characterize intercropping advantages in groundnut-fingermillet intercrop in relation to crop combination ratios, soil moisture and nitrogen (N) availability. Three intercrops in 1 : 2, 1 : 1 and 2 : 1 alternating rows of groundnut and fingermillet were examined for their growth and yield in comparison with their respective sole crops in 1996. The effect of well watered (W) and water stressed (D) conditions on the intercropping advantage was also examined for 1 : 1 intercrops in 1995 and 1996. Fertilizer N was applied at the rate of 20 kg ha^?1 in 1995 and 50 kg ha^?1 in 1996. The total above-ground biomass (DM) and its land equivalent ratio (LER) were highest in the 1 : 1 combination ratio. The DM production of intercropped fingermillet was higher in 1996 with higher N than in 1995 with low N application, while those of groundnut were similar in both years. The intercropped groundnut exhibited significantly higher DM production after the fingermillet harvest. The LERs in grain yield were higher in 1996 (1.43 under W and 1.45 under D), than in 1995 (0.87 under W and 1.22 under D). Also, LERs were consistently higher under D than W conditions. Water stress severely reduced the leaf area index (LAI) of fingermillet at a low N, especially in the later stages, whereas higher N alleviated the water stress effect. A close linear relationship was observed between LAI and leaf area (LA) per unit leaf N both for groundnut and fingermillet, with intercrops producing larger LA per unit leaf N than sole crops. Intercropping maintained higher ability in leaf net photosynthesis and transpiration of groundnut up to later stages, and significantly reduced water evaporation from the soil surface under the canopy than sole cropping of fingermillet. These results suggest that three processes associated with the intercropping yield advantages in the groundnut-fingermillet intercrop; 1) higher leaf photosynthesis and vigorous growth of groundnut after the fingermillet harvest, 2) higher LA production per unit N and 3) efficient water use. In conclusion, interspecific shading was considered to be the key mechanism associated with these processes, leading to the intercropping advantages. The degree of the interspecific shade and its effect on growth and yield depended on the available soil N and water.     

保护森林资源 加强国土生态环境建设

林业既是一项十分重要的公益事业,又是一项十分重要的基础产业,既有不可替代的生态效益,又有十分显著的经济效益和社会效益。改革开放以来,我国林业建设取得了举世瞩目的成就,实现了森林面积和蓄积的双增长,森林覆盖率有了很大的提高。     

玉山县发展速生丰产用材林展望

充分利用玉山县优越的自然和人力资源,运用科技力量,新造4000 hm2杉木和湿地松速生丰产林,建立和完善速生林基地及管理机构,实行规模经营,可加速玉山县林业产业快速发展,壮大林业经济.     

海南生态公益林生态系统服务功能价值评估报告

阐述海南森林资源概况,以海南公益林为对象评估森林的服务功能和生态经济价值,从涵养水源、保育土壤、固碳释氧、积累营养物质、净化大气环境、森林保护、保护生物多样性、森林游憩等8项服务功能进行评估,得出森林生态系统服务功能的总价值。通过评估发现8项服务功能的价值巨大,以此来加深人们对生态环境的保护和重视。