我国蓝马鸡生物学研究进展

蓝马鸡为我国特有的珍稀鸟类,被列为国家Ⅱ级重点保护鸟类。蓝马鸡仅分布在青藏高原东缘的青海、甘肃、四川三省交接区域以及宁夏贺兰山地。从进化地位、栖息地选择、习性、食性、生理生化、人工养殖等方面对蓝马鸡的研究现状进行综述,以期全方面的了解蓝马鸡的生物学信息。     

浅议黑龙江伊春旅游度假地产发展

旅游房地产是房地产的一个重要分支。伊春做为＂中国优秀旅游城市＂、＂中国最佳避暑胜地＂,在保护环境的前提下,依托景区开发适度适宜的旅游度假地产是伊春市旅游市场开发和产业发展的需要和必然,符合21世纪旅游业发展的趋势和方向,发展前景十分广阔。本文结合国内外及黑龙江省伊春市的旅游发展状况及未来发展趋势探讨了黑龙江省伊春市旅游地产的发展前景,并对旅游地产的开发提出了一些建设性意见。     

新型林业发展模式——循环林业

现代林业弥补了传统林业忽视森林生态功能和环境功能的缺陷,但没有充分考虑林业资源的有限性和再生周期性。而循环林业作为一种新型林业发展模式,通过森林资源的物质循环将林业种植业、林业工业和林业服务业联结起来,实现森林资源多层次阶梯式循环利用和林业的可持续发展。     

不同施肥量对“黄冠”梨果实发育特性及品质的影响

以7年生黄冠梨/杜梨为试材,研究了不同施肥量对黄冠梨果实发育特性及品质的影响。结果表明:随着肥料用量的增加,黄冠梨的单果重明显增加(尤其在果实膨大期),果实纵径/横径值逐渐增大,果实的可溶性固形物含量有所增加;施肥量对果实硬度的影响没有规律。     

亲环素基因在烟草不同器官及叶片不同发育时期的表达规律研究

通过对烟草中3个亲环素家族基因（CyPl、CyP2、CyP40）表达模式的研究,结果显示：在不同发育时期中,CyPI在烟草移栽后40、50、60d时表达量较高,CyP2则是在移栽后30、40、60d表达量较高,而CyP40只在移栽后60d表达量较高。在不同组织部位及器官的表达中,3个亲环素家族基因在中部叶和下部叶中表达均较强。在烟草根中主要表达CyPl和CyP40基因,CyP40还在花中表达较高,而CyP2基因的主要表达器官为叶片。     

Duration of vegetative and generative development phases in oat cultivars released since 1921

Genetic yield improvements in oat (Avena sativa L.) cultivars grown at high latitudes have resulted from marked changes in harvest index and yield components. This study was designed to investigate whether such changes have entailed alterations in duration of different developmental phases: vegetative, generative and grain filling phases and pre-anthesis generative sub-phases such as pre-fertile, pre-abortion, fertile pre-abortion, fertile and abortion sub-phases. We tested 14 oat cultivars released between 1921 and 1988 and 6 breeding lines. Ten randomly sampled plants of each oat entry were collected every 3–4 d (18 times) from seedling emergence until pollination, and apical developmental stages were determined on the most advanced spikelet. Cumulated degree-days (Cdd) for each critical developmental stage and component phases were determined (5 °C as a base temperature). At each measurement the number of leaves, green leaves and tillers on main shoot, apex length (mm) and height to the uppermost node, and stipule (cm) were recorded. Phyllochron (°C d leaf⁻¹) and relative elongation rates (RER) for height characterising traits were calculated. Grain filling was the only period altered by breeding, while no consistent effects on duration of vegetative and generative pre-anthesis phases and sub-phases were detected. Different developmental phases were interrelated: in some cases cultivars with similar duration of pre-anthesis phase, however, differed in duration of some pre-anthesis sub-phases. Their duration was not, however, consistently associated with measured growth and yield parameters. Likely long days that make the northern growing conditions exceptional and unique, substantially narrowed the differences among oat entries in duration of different developmental phases, thereby making their role also less critical in yield determination contrary to the situation in the main global temperate cereal production regions.     

Idiopathic cystitis in domestic cats--beyond the lower urinary tract

Signs of lower urinary tract (LUT) disease in domestic cats can be acute or chronic, and can result from variable combinations of abnormalities within the lumen of the LUT, the parenchyma of the LUT itself, or other organ system(s) that then lead to LUT dysfunction. In the majority of cats with chronic signs of LUT dysfunction, no specific underlying cause can be confirmed after standard clinical evaluation of the LUT, so these cats typically are classified as having idiopathic cystitis. A syndrome in human beings commonly known as interstitial cystitis (IC) shares many features in common with these cats, permitting comparisons between the two species. A wide range of similarities in abnormalities has been identified between these syndromes outside as well as inside the LUT. A variety of potential familial and developmental risk factors also have been identified. These results have permitted generation of the hypothesis that some of these people have a disorder affecting the LUT rather than a disorder of the LUT. This perspective has suggested alternative diagnostic strategies and novel approaches to treatment, at least in cats. The purpose of this review is to summarize research investigations into the various abnormalities present in cats, to compare some of these findings with those identified in human beings, and to discuss how they might modify perceptions about the etiopathogenesis, diagnosis, and treatment of cats with this disease. Dedication: I dedicate this contribution to Professor Dennis J. Chew, whose collaboration, patience, and support made it all possible.     

陕西肉牛产业发展现状、问题及建议

文章在调查研究的基础上,对陕西肉牛产业发展现状及产业技术研发应用情况进行了综合述评,认为全省肉牛产业已进入以秦川牛为主肉用选育改良和商品肉牛生产时期,技术研发和应用稳步推进,各地扶持政策措施比较到位,肉牛产业发展势头良好。针对产业转型升级面临的问题,文章从三个方面提出了发展建议。     

光信息技术在现代农业中的应用研究

以遥感科学与技术的定量化发展为切入点,系统的阐明了光信息与定量遥感技术在我国现代农业中应用现状与发展趋势。详细阐述了遥感科学与技术定量化发展的含义和应用意义,从农业资源调查及动态监测、农作物估产、灾害监测与评估,以及农业气象应用等几方面系统的回顾了遥感技术在我国农业中的应用历史和现状;最后分析了光信息及定量遥感技术与现代农业发展模式之间的关系,给出了促进我国农业信息化的发展趋势与方向。     

温度对茶蚕卵期发育影响的研究

茶蚕Andraca bipunctata walker(鳞翅目,蚕蛾科)的卵,在有效温度范围内,发育进度随温度升高而加快。在恒温条件下,卵的发育起点温度为7.39℃,有效积温常数为201.69日度。卵期发育的数学模式:y=7.39+201.69x,预测式:N=(201.69±32.34)/(T-(7.39±2.90))。