新疆各地区平原林业资源评价及平原林业产业发展的初步研究     

陈健  毛霞 《新疆农业大学学报》1995,(2)

本文对新疆各地区平原林业自然资源赋存的绝对丰度和相对丰度进行了分析，计算出各地区自然资源的综合优势度与组合指数，并据此评价各地区发展林业产业的优势所在，初步提出各地区在发展平原林业产业方面的建议。  相似文献   

论生态环境与畜禽健康—热环境和应激对畜禽健康的影响     

汪植三  吴银宝等 《家畜生态》2001,22(2):1-7

随着集约化和规模化畜牧业的发展，环境应激对畜牧生产和健康产生了巨大的影响，我国夏季大部分地区高温又使畜牧业生产蒙受了巨大的损失。本文结合我国畜牧生产实际，论述了应激和热环境对畜禽健康的影响，旨在引起人们对畜禽生态环境改善的关注。  相似文献   

良紧性的相对可乘性     

潘国英 《福建农林大学学报(自然科学版)》2006,35(5):558-560

良紧性是格上拓扑学最重要的概念之一,具有可乘性质.而对于相对乘积运算,它的可乘性又如何?本文证明了良紧性同样具有相对可乘性质.  相似文献   

淮北地区黄牛不孕症研究──Ⅰ·临床学调查     

徐良玉  关玉堂 《畜牧与兽医》1997,29(5):203-205

查明了淮北地区鲁西黄牛初情期等１０项生殖生理参数；证实不孕症发病率为２６．３％及其分类，；应用微生态方法定量检测不孕牛阴道菌群，查明优势菌为表皮葡萄球菌和链球菌  相似文献   

A Comparison of the Ecovalence and the Variance of Relative Yield as Measures of Stability     

H. P. Piepho 《Journal of Agronomy and Crop Science》1994,173(1):1-4

Yield stability is an important trait of crop cultivars. There are different concepts and measures of stability, and new ones are constantly being proposed, leaving the practitioner with an ever growing collection of measures to chose from.
In order to facilitate the choice it is useful to study the relationship between stability measures. This paper compares the well known ecovalence to a new measure, the variance of relative yields. It is argued that under rather restrictive conditions the new measure is essentially equivalent to the ecovalence, while in most cases it displays an undesirable dependence on genotypic mean yield. It is concluded that the ecovalence is generally preferable.  相似文献   

用单片机8031组成的干湿球温湿度数字测示仪     

巴寅亮  邓传玲  李桂森 《新疆农业大学学报》1995,(1)

本文详细介绍了用单片机８０３１组成的干湿球温湿度数字测示仪的设计思想，给出了电气原理图及它的编程和使用方法．该测示仪的设计为在生产实践的各个领域中对环境温湿度的测试带来了方便．  相似文献   

天幕毛虫生物学特性的观察   总被引：2，自引：0，他引：2  

孟瑞霞 《内蒙古农业大学学报(自然科学版)》1995,(3)

本文通过室内和田间试验所取得的数据结果表明，天幕毛虫幼虫共分６龄；卵寄生率为５％；室内饲养全幼期死亡率为１００％；感染病毒是幼虫死亡的主要原因。自然生态因子影响幼虫的存活，以１～２龄幼虫死亡率最高，占全幼期死亡率的９１．９％。试验的温湿度对出壳率无显著影响。在适宜温度范围内，温度高寿命短，存活率低。各龄幼虫发育速率随着温度升高而加快，相对湿度在４０．０～９２．０％之间是幼虫生活的适宜湿度范围，１～４龄幼虫发育历期与湿度呈显著直线相关关系。  相似文献   

富硒麦芽硒在鸡蛋中的分布及蛋鸡对其相对生物利用率   总被引：11，自引：1，他引：10  

李家奎  王小龙  赵圣  韩博  向瑞平  王金勇 《中国兽医学报》2001,21(4):395-398

采用短期饲喂试验研究了富硒麦芽硒在鸡蛋中的沉积以及蛋鸡对其相对生物利用率。将30羽70周龄，产蛋率60%的伊莎蛋鸡随机均分为3组，A组为对照组，饲以基础日粮(含硒0.23mg/kg)；B、C组为试验组，B组饲以基础日粮加亚硒酸钠，日粮含硒(0.70±0.03)mg/kg,C组饲以基础日粮加富硒麦芽，日粮含硒(0.72±0.02)mg/kg。试验过程中观察蛋鸡的生产性能，定期从各组鸡所产蛋中随机抽取5枚测定蛋清、蛋黄硒含量，计算总硒量。试验结束时，每组鸡全部扑杀，测定其全血、肝、肾硒含量和GSH-Px的活性。结果显示，日粮中加硒可提高鸡蛋、肝、肾硒含量和全血、肝、肾GSH-Px活性，但对蛋鸡生产性能无显著影响；与亚硒酸钠一样，饲喂富硒麦芽鸡所产蛋中的硒主要存在于蛋黄中；以亚硒酸钠的相对生物利用率为100%计，富硒麦芽硒提高肝、肾硒含量和GSH-Px活性的相对生物利用率分别为86.4%、98%、116%、111%。  相似文献   

Effect of Climatic Variation on Yield of Sesame (Sesamum indicum L.) at Different Dates of Sowing     

R. Nath  P. K. Chakraborty  & A. Chakraborty 《Journal of Agronomy and Crop Science》2001,186(2):97-102

Although experiments have previously been carried out to determine the optimum sowing time of sesame, very few attempts have been made to determine the effects of macro and micro climatic variation on yield. Thus a field experiment was conducted at the University Research Farm, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, India on an Entisol (alluvial, sandy loam) in the summer seasons of 1996 and 1997 to assess the effects of macro and micro climatic variations on yield of sesame for various dates of sowing. The number of seeds per capsule of sesame was highest in the crop sown on 19 February, although up to the 18 April sowing there was no significant variation. There was no appreciable variation in thousand-seed weight with date of sowing. Crops sown on 19 February and 1 March produced statistically similar yields. The average reduction in yield of sesame was 78.5 and 213 %, respectively, for crops sown on 10 February and 28 April, compared with the crop sown on 19 February. The cultivar Rama produced higher yields than B-67 and Kanke-1. Ambient temperature above 30 °C up to 100 % flowering had a direct positive effect on sesame yield. Crop exposure to 60–70, 70–80 and  80 % relative humidity up to 100 % flowering had a direct negative effect. Temperature profile at 50 days after emergence (DAE), relative humidity at 60 DAE, and photosynthetically active radiation (PAR) at 30 and 40 DAE within the crop canopy had direct positive effects on yield. Regression models suggested that temperature profile and PAR within the crop canopy produced 72 and 35 % variation in yield, respectively.  相似文献   

论交际者的社会信息对翻译的影响          下载免费PDF全文

杨家勤  郑红 《安徽农业大学学报》2006,(4):117-120

任何语言里都存在有大量的特殊词,这些词普遍带有某种特殊的社会意义,体现着个体的社会信息,如社会地位、受教育程度及交际者之间的相互地位等等。译者对此应给予足够的重视,要充分地分析各种社会信息以便完美地保留原作的信息。  相似文献