Determination of suitable chemical extraction methods for available zinc content of paddy soils at Thrace Region

This research was carried out in order to determine the zinc status of the paddy soils with different physical and chemical properties of Thrace region as well as to determine the most suitable method for chemical extraction of available zinc content of soils for plant. As a result of the investigation with 12 paddy soils representing the region, it was estimated that the application of increasing amounts of zinc to the soil of pot grown maize to increasing the zinc uptake, dry matter and zinc content of the plant was determined. Nine chemical extraction methods for available zinc contents of soil were used and the reliability of the investigated methods was ranked as: 0.005 r M DTPA+0.01 r M CaCl 2 +0.1 r M TEA; 0.005 r M DTPA+1 r M NH 4 HCO 3 ; 0.01 r M Na 2 EDTA+1 r M (NH 4 ) 2 CO 3 ; 0.01 r N Na 2 EDTA+1 r N NH 4 Oac; 0.01 r N Na 2 EDTA; 1 r N NH 4 Oac; 2 r N MgCl 2 ; 0.05 r N HCl+0.025 r N H 2 SO 4 ; 0.01 r M Hidrocinon. The method for extraction with 0.005 r M DTPA+0.01 r M CaCl 2 +0.01 r M TEA solution which not only owns the highest correlation coefficient but also enables determination of Fe, Mn and Cu concentrations in addition to Zn amount, could be recommended as the most suitable one for the investigated soils.     

小麦的高产育种途径及其发展趋势

探讨了小麦高产育种的6种途径.从小麦育种的历史看,随着小麦品种产量潜力的提高,所需要协调的性状不断增加,从少数性状的协调到多性状的协调,从形态性状的协调到生育动态性状的协调,育种难度逐步增大.小麦高产育种就是不断协调各个性状关系,挖掘小麦光能利用潜力,促进光合产物的分配向经济产量倾斜.现阶段小麦自身的光合利用潜力尚未全部发挥出来,通过株型、生育动态的调整还可提高小麦的产量潜力.小麦育种的更高阶段是提高小麦自身光合机能.     

生物酶洗涤剂综述

综述了农药的微生态降解、农药残留对人体和环境的危害、果蔬农药残留的现状,介绍了目前的果蔬清理方法以及生物酶降解,并展望了生物酶洗涤剂今后的研究方向.     

水产动物营养学课程教学改革研究

针对水产动物营养学课程在课堂教学过程中存在的问题,从教学内容、教学方法以及考核方式等方面进行了有益的探索,以期为该课程的本科教学提供参考.     

Establishment of Tabulated Values for Standardized Ileal Digestibility of Crude Protein and Essential Amino Acids in Common Feedstuffs for Pigs

Literature data on apparent ileal digestibility of crude protein (CP) and amino acids in pigs from 79 references (203 observations) including 13 different common feedstuffs, and other data on basal endogenous ileal loss of CP and amino acids from 32 references (36 observations) were analysed statistically. The analyses revealed that the cannulation method as well as the method for determining endogenous ileal losses of CP and amino acids affected the results. After correction for these effects a new set of tabulated values for apparent and standardized ileal digestibility of crude protein and essential amino acids was generated. The results were in most cases in good agreement with three recently published tables for standardized ileal digestibility of amino acids in feedstuffs. Therefore, it was concluded that the data obtained in the present work, together with those given in the recently published tables, would be a suitable basis for a general table for standardized ileal digestibility of CP and amino acids in common feedstuffs for pigs.     

斑马鱼实验室繁育方法研究进展

近年来,斑马鱼因其独特的生物学特性及优势已成为一种新型的脊椎动物模式生物,并渐渐引起世界各国科研人员的重视。但目前在我国斑马鱼实验室养殖及繁育等方面的文献、资料并不多见。笔者对斑马鱼实验室人工饲养及繁育等方面做了较为详细的介绍,旨在为斑马鱼这种重要模式生物的研究提供基础的参考资料。     

医学信息检索校级精品课程建设的实践与思考

从师资队伍、教材建设、教学手段、考试方法等方面介绍了医学信息检索校级精品课程的建设情况,提出了＂以科研促教学,推进教学科研一体化＂的发展模式,总结了医学信息检索精品课程建设的成效,并提出了推进精品课程建设的建议。     

灌水方法对保护地土壤酶活性的影响

灌溉是保护地土壤水分的唯一补给方式。水分管理不善所引发的保护地土壤退化、肥力下降的问题由来已久,通过比较渗灌、滴灌、沟灌3种灌溉方法下保护地土壤过氧化氢酶、磷酸酶、转化酶和脲酶活性的变化,探讨了3种灌溉方法下保护地土壤生物学性状的演化规律。结果表明,磷酸酶、过氧化氢酶、转化酶、脲酶活性因灌水方法不同而表现出差异,总体上是渗灌和滴灌两者接近,且均明显大于沟灌;滴灌处理对土壤肥力质量呈现有利影响。     

淅川县国家级公益林净化大气环境功能价值测算

近年来,由于生态环境的日趋恶化和可持续发展理念的不断深入,人们逐步意识到森林生态系统服务功能对人类生存发展的决定性作用。本研究利用国家林业局发布的森林生态系统服务功能评估规范,对淅川县国家级公益林净化大气环境功能进行了评估。结果表明：淅川县国家级公益林生态系统净化大气环境价值约为31 056.6万元,远超过淅川县每年的造林投入和公益林生态效益补偿。并通过不同林分类型的净化大气环境的功能价值比较,提出在淅川丹江库区应加大针叶林和针阔混交林的营造,以求最大限度地发挥森林生态系统净化大气环境的功能价值。     

麻石电站拦污栅设计改造

针对麻石水电站进水口拦污栅存在的栅条结构锈蚀严重、强度不够等问题,对进水口原有的6扇拦污栅进行了设计改造与更换,使其能满足清污机的工作要求。