子午岭林区油松密度管理图的编制

利用先进的计算工具，编制了“子午岭油松人工林密度管理图”，经检验达到了精度要求。该较为子午岭林区人工油松林的抚育间伐，生长量预测，造林设计等经营活动提供了科学依据。     

中纤板热压机微机测控系统的研究

采用单片机与台式微机结合构成中纤板热压机微机测控系统，用MCS-51汇编语言和基于Windows98的Visual Basic6.0分别编写单片机数据采集与控制程序和微机主控程序，具有数据处理能力强、数据存储量大、操作界面直观方便等优点。系统设计中考虑了系统的可扩展性和通用性，便于系统扩展和移植。     

中国大青杨基因资源研究

收集我国东北林区特有乡土树种大青杨天然基因资源400多份。在黑龙江省伊春带岭建立了我国第一个大青杨基因库，利用常规手段对其生长，物候，抗锈病和木材材性等性状进行了遗传分析，利用高新技术方法从DNA分子水平上探测了大青杨天然群体的遗传结构和分化程度，经综合评价选出5个优良群体，44个优良单株，为该地区营建大青杨人工林奠定了一定基础，为杨树抗性育种等提供了育种材料和信息，认为选择优良个体是近期大青杨改良的一条重要途径。     

Administration of probiotic Bacillus licheniformis induces growth,immune and antioxidant enzyme activities,gut microbiota assembly and resistance to Vibrio parahaemolyticus in Litopenaeus vannamei

This study aimed to elucidate the effects of dietary Bacillus licheniformis ATCC 11946 (BL) on the growth, immune and antioxidant activities, intestinal morphology and microbiota, and susceptibility to Vibrio parahaemolyticus (VP_AHPND) in juvenile pacific white shrimp, Litopenaeus vannamei (LV). Juvenile LV (initial weight = 0.63 ± 0.001) were fed diets containing varying BL concentrations (0 (BL0), 10⁶ (BL1), 10⁷ (BL2) and 10⁸ (BL3) CFU/g feed) for 8 weeks. Growth performance, immune and antioxidant enzyme activities, and intestinal morphology significantly improved in the probiotic‐treated groups than the untreated. Regardless of the treatment group, the two dominant phyla were Proteobacteria and Bacteroidetes, whereas the two dominant genera were Ruegeria and Vibrio. Increasing inclusion of probiotics in diets led to significant increase in beneficial bacterial genera (Ruegeria, and Pseudoalteromonas) and a significant decrease in some known opportunistic pathogens (Vibrio, Tenacibaculum, Photobacterium, Kangiella and Spongiimonas) with the BL3 group witnessing the best. A 7‐day challenge study with VP_AHPND showed significantly high protection in the probiotic‐treated groups, with the BL3, BL2 and BL1 obtaining 51%, 34% and 22% relative percentage survival, respectively. In conclusion, BL at 10⁸ CFU/g feed should be used to help in shrimp production since it attained the most significant improvement.     

应用TDR对土壤含水率及土壤冻结融解深的计测

运用 TDR(Time Domain Reflectometry)计测土壤含水量 ,80年代以来就受到了瞩目 ,到今天为止TDR方法在土壤盐分浓度 ,浸润面深度 ,冻结融解面深度等许多领域得到广泛应用。为了确认在运用 TDR方法进行土壤含水率测定时介电常数 ε与含水率 θ之间的关系曲线的滞后现象的有无 ,以及确认运用 TDR方法计测土壤冻结融解面深度的有效性 ,进行了一系列的实验。实验证明 ,在运用 TDR方法进行土壤含水率测定时介电常数ε与含水率θ之间的标定曲线中没有出现滞后现象 ,运用 TDR方法计测土壤冻结融解面深度不论在室内实验还是在田间实验中都很有效 ,并取得了较高的精度。     

Study on Inheritance and Development of Traditional Street, Lane and Courtyard in City Growth

City is not a concretionary but a dynamic matter. It should keep close touch with the animated tradition, and we should look forward to its future too. Thus we will be facing with the problem of inheritance and development of the tradition. Because the tradition is a potential for good as wdll as for evil, it can promote the development of a thing, and also may hinder its progress, so there should be correct attitudes to the traditional inheritance. This paper studies the modem application of the traditional street, lane and courtyard, which brings new vitality to the tradition and imparts fresh life to the modem city.     

Discussion about the Agent- Construction System of Governmental Project in China

The agent - construction system, as a new public project management mode, has been practiced in some cities and attracted attention from the society. This paper firstly studies the features and operation modes of agent - construction system, and discusses the agent - construction system from the viewpoints of promoting competition, nourishing agent -construction enterprises, setting up a supervisory and encouraging mechanism, and its connection with the governmental project procurement system etc.