The　Brief　Introduction　to　the　Sino-US　Joint　Centers　for　Soil　and　Water　Conservation　and　Environmental　Protection     

LIJing LIRui ZHENGFen-li 《水土保持研究》2004,11(4):174-176

Erosion and transport of soil has worldwide implications for agriculture, landscape stability, climate, natural hazards, and clean, renewable resources of water and air. Assured access to clean water and a healthy and safe environment requires an ethic of conservation and protection. The minimum scale in which these principles apply successfully is basin wide. These are the fundamental concerns of the Sino-US Centers for Soil and Water Conservation and Environmental Protection.  相似文献   

土壤养分位与广义氧化还原电极电势     

龚兆胜  洪常青  黄红苹 《云南农业大学学报(自然科学版)》2004,19(4):462-466

 根据广义氧化还原理论,给出了土壤溶液中NH₄⁺,P,Ca等养料成份的广义氧化还原电极电势。与养分位比较,用广义氧化还原电极电势来量度土壤养分有效度具有较多的优越性。  相似文献   

学校档案管理工作进展的思考     

刘银辉 《湖南农机》2009,(4):73-74,92

目前学校档案管理工作中存在的一些问题亟待解决，档案管理工作的基本原则包括整体性原则、服务性原则和社会化原则，学校的档案管理工作唯有创新才有出路，重点应加强观念创新，技术创新和知识创新。  相似文献   

国内高架桥绿化及研究现状     

关学瑞  蔡平  王杰青  赖丁红  程永华  李凌 《黑龙江农业科学》2009,(2)

从高架桥区的生态环境、适生种类的选择以及高架桥绿化的养护管理、景观配置模式四个方面对国内的高架桥绿化及研究现状进行了分析和探讨,指出了存在的问题和解决方法,并对高架桥绿化的前景进行了展望.  相似文献   

Study on Cultural Technologies and Salt-resistance of Nitraria sibirica in Coastal Areas with Serious Salt-affected Soil     

ZHANG Jianfeng XING Shangjun SUN Qixiang XI Jinbiao SONG Yumin Research Institute of Forestry  CAF  Silvicultural laboratory of Forestry  SFA  Beijing  P.R.China Shandong Academy of Forestry  Jinan  P.R.China 《中国林业科技(英文版)》2004,3(4):12-16

In this research, five Nitraria sibirica provenances such as Dayilu were selected to do experiment of salt-resistance, combining fixed plots test with typical plot investigation, measuring survival rate and growth as main indicators. The experiments of main cultural technology were done on Nitraria sibirica in 4 types of site preparation, 3 types of planting, 3 designs for planting density. The Nitraria sibirica experiments for the effects of curbing salt and improving soil were done by testing soil nutrients, salt content, soil physical properties as focal points in typical site of 3-4 years woods. The experiment results showed that the Nitraria sibirica could survive well with soil salt content of 0.6%, and that survival rate declined distinctively as soil salt content exceeded 0.8%. However, high soil salt content did not influence growth in the year of planting. There were obvious differences in salt-tolerance among Nitraria sibirica provenances; Dayilu was the best on salt-tolerance, the other 4 pro  相似文献   

迷宫螺旋槽的选取研究     

龚林  王春林  施爱平 《农业装备技术》2004,30(3):33-35

以提高迷宫螺旋泵的扬程、流量、效率、汽蚀等性能参数为目标,给出不同使用条件下螺旋槽形状与几何参数的选取。  相似文献   

Narbon Vetch (Vicia narbonensis L.): A Potential Feed Legume Crop for Dry Areas in West Asia     

A. M. Abd El  Moneim 《Journal of Agronomy and Crop Science》1992,169(5):347-353

Provision of feed supplies for the rapidly growing livestock population is essential in West Asia. Shortages can be alleviated by growing forage crops in the existing fallow lands.
Narbon vetch (Vicia narbonensis L.) is a leguminous species with high yield potential, drought tolerance and cold resistance. It could be used for grain and straw production as source for animal feed in dry areas. It is good source of protein with seeds contain 28 % protein yielding 364 kg per hectare protein, whilst straw contains 9 % protein and yields a similar amounts of digestible protein per hectare.
Nine promising lines of Narbon vetch developed at ICARDA were tested at two sites over four years under rainfed conditions. Since climatic conditions were considered to be of considerable importance, each site in each year was treated as a separate environment to give eight environments with annual rainfall varied from 195 to 504 mm.
Narbon vetch possessed high seedling vigour with rapid winter growth and negligible cold damage. Grain yield varied form 0.47 to 1.90 t/ha, with a harvest index varying from 30 to 40 %. The data indicated that below 300 mm rainfall the grain yield varied from 0.47 t/ha when rain fall was 195 mm to 1.4 t/ha when rainfall was 245 mm. Most of the lines had wide adaptation to dry areas in terms of both grain yield and stability. Climate, except early spring rains had little effect on biological and grain yields.  相似文献   

论木材运输管理的问题与对策   总被引：2，自引：0，他引：2  

周元旺 《浙江林业科技》1996,16(6):26-30

木材运输管理是森林资源管理的主要环节和重要手段，是对森林采伐限额制度执行情况监督的必要措施，由于受短期和局部利益的驱动，一些木材经营者为追求高利润，采取不法手段，千方百计地进行木材违法运输，也有部分木材检查站由于管理不善，也存在执法不严和违纪犯法现象，为此，提出了加强对木材检查站的领导和建设、建立巡警队或稽查队加强对木材运输的检查、实行县（市）内木材运输证制度、进一步完善林业法律、法规和规章及强化宣传等措施。  相似文献   

活性炭吸附痕量银的研究   总被引：3，自引：0，他引：3  

蒋婷  施荫锐 《林产化学与工业》1996,16(2):49-53

在静态、动态吸附条件下，分别选用果壳类净水用活性炭和煤质净水用活性炭对胶片工业废水中的痕量银的吸附行为进行了研究．结果表明，废水中的银浓度可降至＜５０ｐｐｂ，活性炭对银的吸附量达到３～５ｍｇ／ｇ．微孔发达的活性炭更适于吸附废水中的痕量银．随着银液浓度的升高，银液量增大，活性炭吸附能力增加．银液的最佳吸附ｐＨ值是５．  相似文献   

福建省贮木场的发展出路     

周新年 《森林工程》1996,12(4):28-32

本文对福建省贮木场的发展历史进行扼要回顾,分析和评述了木材市场开放后福建省贮木场的现状,针对发展中存在的问题,并紧紧围绕经济发展的两个根本转变,对贮木场的发展出路提出看法。  相似文献