论立式金属罐参照高度变化的随机性

当前，对动作中立式储罐的参照高度认为是固定值的看法，是不切剑实际的。在立式罐结构分析中，认为参照高度实际产生随机变化有其必须性，并通过国内外立式罐参照高度的实测数据和资料予以证实。确认立式罐参照高度在立式罐容量标定和计量过程中实际存在着０变化的随机性，而且会对立式罐容量的标定和计量的准确度产生明显的影响，在大多数情况下已超过允许误差范围。     

中华松针蚧对云南松高生长的影响

云南松受中华松针蚧危害,当针叶虫口密度≤3只/束时,高生长量无损失;当针叶虫口密度>3只/束时,随着虫口密度的增大,高生长量损失逐渐增大;在同一虫口密度下,立地条件好的云南松受害后,其高生长损失大;据不同立地条件、不同虫口密度水平下云南松高生长损失大小,将发生中华松针蚧林分的林木分为健康、轻、中、重、特别严重5个等级.     

黑白花奶牛几项血清生化指标的测定

对郑州工作奶站33头健康黑白花奶牛几项血清生化指标进行了测定。这些测定值可作为郑州地区奶牛营养监测和营养状态判断的参考数据。     

我国北方观光果园果树的景观设计

在阐述果树个体观赏特点的基础上,本着因地制宜与适地适树、果品生产与观光旅游相结合、果树文化内涵、以人为本等原则,从平面设计、立面设计、季相设计、造型设计、叶花果设计、果文化设计等多个方面探讨了观光果园果树的景观设计。这种景观设计既能满足果树生长发育的生态条件要求,又能营造特殊的果园景观,实现果品生产与观光旅游的双重目标,获得更好的经济效益、生态效益和社会效益。     

两个海拔高度下甘蓝型油菜主要农艺性状及其对产量的影响

以9个甘蓝型油菜品种为研究材料,对其进行两个不同海拔高度的试验。研究表明:在高海拔下,对单株产量贡献大的前六个性状依次是,全株有效果数>每果粒数>千粒重>主序有效果数>分枝部位>主序长度。在低海拔区依次是,每果粒数>全株有效果数>千粒重>主序有效果>主序长度>分枝部位。方差分析结果表明:高海拔区油菜产量低于低海拔区产量,两者差异达极显著。海拔高度升高,油菜的株高、分枝部位、单株产量降低,一次有效分枝数和全株有效果数明显减少,千粒重增加。     

黄杨绢野螟生物学特性研究

摘要本文阐述了黄杨绢野螟[Diaphania perspectalis(Walker)]在上海地区年发生3代,并以3～4龄幼虫在黄杨木叶片上结苞越冬。翌年3月中下旬开始活动为害;经过2个世代后,第三代幼虫于9月中旬起陆续结茧越冬。同时对该虫的各虫态发育历期、生物学特性等进行了研究,为指导防治提供依据。     

全站仪在立木材积测定中的应用研究

利用全站仪无反射镜测距与特殊程序测量(遥测悬高、对边测量),能在树干可见部位任意高度准确测出高度与直径,并对其观测精度进行了分析,为立木材积和林分生长量以及生长规律的研究提供可靠依据。该法具有操作简单、速度快、精度高的特点,便于测树学的研究和应用技术的推广。     

QTL Analysis for Plant Height with Molecular Markers in Maize

Plant height has become one of important agronomic traits with the increase of planting densityrecently and the rapid developments of molecular markers have provided powerful tools to localize importantagronomic QTL at the genomic level. The purposes of this investigation are to map plant height QTL with mo-lecular markers and to analyze their genetic effects in maize. An F2:3 population from an elite combination(Zong3 × 87-1) was utilized for evaluating plant height in two locations, Wuhan and Xiangfan, with a ran-domized complete block design. The mapping population included 266 F2:3 family lines. A genetic linkagemap, containing 150 SSR and 24 RFLP markers, was constructed, spanning a total of 2 531.6 cm with an av-erage interval of 14.5 cm. Totally 10 QTL affecting plant height were mapped on six different chromosomeswith the composite interval mapping. Seven of 10 QTL were detected in two locations. The contributions tophenotypic variations for the single QTL varied between 5.3 and 17.1%. Additive, partial dominance, domi-nance, and overdominance actions existed among all detected QTL affecting plant heights. A large number ofdigenic interactions for plant height were detected by two-way analyses of variance. 107 and 98 two-locus com-binations were found to be significant at a 0.01 probability level in two locations respectively. 23 of them weresimultaneously detected in both locations. They accounted for phenotypic variations of 4.5 -11%. It was no-ticed that a locus, umc1122, had digenic interactive effects with other four different loci for plant height,which distributed on three chromosomes. A few of plant height QTL was involved in significant digenic inter-actions, but most significant interactions occurred between markers that are not adjacent to mapped QTL.These results demonstrated that epistatic interactions might play an equal importance role as the single-locuseffects in determining plant height of maize.     

关于影响果树光合作用因子的概述

光合作用是作物产量形成的基础,研究果树田间条件下的光合特性对提高产量和品质具有重要参考价值。通过叙述果树光合速率的季节变化和日变化,尤其对影响果树光合作用的内外因子进行了详细阐述,为其栽培和管理技术提供了理论依据。     

陕北黄土高原果树建设分区研究

根据陕北黄土高原的自然生态环境,果树生产现状和果树分区原则,将该区果树生产划分为北部神府海红果产区,毛乌素沙地酿酒、制汁葡萄产区,横山、白于山山区山杏、山桃产区,延河中下游商品苹果、梨产区,黄河沿岸优质红枣产区,中部、南部多种果树产区,洛川塬优质苹果产区7个区域,提出各区果树发展的主要方向、规模和发展措施。