阿克苏地区农业资源生产潜力评价与开发分析

本文针对阿克苏地区的农业资源条件进行了分析与评价，并对光合生产潜力、光温生产潜力、光温水(气候)生产潜力及光温土生产潜力、光温水土生产潜力进行了计算。在此基础上，对提高本地区农业资源生产潜力的主要措施进行了讨论。     

不同肥料用量组合对烤烟产值的效应

选择氦、钾、饼肥作为决策变量，研究其对烤烟产值的影响。采用三因素水平二次回归通用旋转组合设计，获得了3个决策变量（Xi）与目标函数（Ya)相互关系的数学模型。分析其试验因素效应和交互作用，并通过计算机模拟寻优，优选出最佳施肥方案，即纯氮施用量为62.26-75.43kg/hm^2，纯钾施用量为191.91-222.02kg/hm^2，饼肥施用量为77.85-115.98kg/hm^2。     

环境因子对苹果树水势的影响及其日变化规律

在露地条件下对不同嫁接组合红星和金冠苹果树枝条、叶片及果实水势测试并应用灰色系统方法建立苹果树水势与环境因子日变化规律的GM (0 ,4)模型 ,结果表明 :苹果树各器官水势日变化均为早晨较高 ,午间或午后达最低值 ,傍晚回升到高于早晨的水平 ;温度、相对湿度和辐射照度是苹果树各器官水势日变化的主要影响因子 ,且不同嫁接组合苹果树各器官水势日变化的一次累加生成时间序列与温度、相对湿度及辐射照度日变化的一次累加生成时间序列呈线性函数关系     

载牛冠状病毒N蛋白壳聚糖微球的免疫效果评价

为了对壳聚糖分子作为佐剂的缓释效果进行免疫学评价,本研究合成了牛冠状病毒DB2毒株N蛋白基因的3'端第487位～1287位碱基,用大肠杆菌对其进行了高效表达,通过SDS-PAGE电泳分离、电洗脱纯化该牛冠状病毒N蛋白(BCV N).以戊二醛为交联剂,采用乳化交联的方法制备空白壳聚糖微球.利用吸附法制备载BCVN蛋白的壳聚糖微球,通过肌肉注射途径免疫BALB/c小鼠,用间接ELISA方法检测免疫鼠血清中的抗体水平,由此评价壳聚糖微球对BCVN的缓释作用和佐剂效应.结果表明,壳聚糖微球的形态较好、表面光滑、分散性较好,平均粒径为6.50±1.77μm,电势分布在36 mV,吸附BCV N蛋白的壳聚糖微球在体内所产生的免疫效果明显优于唯N蛋白组,说明载BCV N蛋白的壳聚糖微球在体内具有一定的缓释效果,使N蛋白在体内缓慢释放而长时间诱导抗体的产生,该研究结果为以壳聚糖微球作为疫苗佐剂积累了实验数据.     

东北红豆杉生长与气象因子关系的初步调查

应用灰色系统理论中的关联分析方法，分析并指出了影响东北红豆杉生长的气象因子大小顺序依次为：本地气压，相对湿度，地面最高温，日最高温，风速，降水量，水汽压，５ｃｍ地温，１５ｃｍ地温，日最低气温，气温，地面均温，蒸发量，地面最低温，４０ｃｍ地温；绘制了东北红豆杉树高，地径生长量曲线，确定出相应生长量的最佳物候期，为东北红豆杉的经营利用提供了良好的理论；利用关联分析得出的影响东北红豆杉生长的主要气象因子     

MINERALIZED ARTERIOSCLEROSIS IN A CAT

In radiographs of a domestic short haired cat of unknown age, mineralization was identified in the pulmonary parenchyma, peripheral pulmonary vessels, the aortic outflow tract, aortic valve, celiac artery, cranial mesenteric artery, and the internal and external iliac arteries. The diffuse arterial mineralization was characterized histopathologically as arteriosclerosis. This is the first report of mineralized arteriosclerosis in a cat with corresponding radiographic signs. The arteriosclerosis is thought to be due to systemic hypertension but a definitive cause for the profound mineralization was not found. Causes of soft tissue mineralization are reviewed.     

肥料袋控缓释对草莓N素利用率及其产量的影响

以鬼怒甘草莓为试材,应用同位素15N示踪技术,研究肥料袋控缓释对设施促成栽培草莓氮素利用率及其产量的影响。结果表明:盆栽条件下,肥料袋控缓释处理比同剂量散施处理氮素利用率提高1倍以上,肥料回收率增加1.7倍,产量约增加0.5倍;在田间条件下,袋控缓释处理比同剂量分2次(定植与开花前)施用,总产量提高12%左右,但前期产量约下降10%。     

氮磷钾配施对保护地番茄产量及品质的影响

利用二次通用旋转组合设计，经微机分析，建立了氮磷钾与保护地番茄产量形成及果实品质的数学模型。结果表明，氮对产量形成及果实的品质影响最大。在适宜范围内，随着施氮量的增加，产量明显增加，果实中的维生素Ｃ、还原糖及有机酸的含量增加。施氮过量则产量变低，品质变劣。磷钾肥对促进番茄产量形成具有间接作用，利于提高番茄产品品质。但过量施用磷钾肥也对果实品质不利。     

A seasonal survey of surface water habitats within the River Spey basin,Scotland: major nutrient properties

• 1. Current monitoring strategies of governmental organizations tend to be focused on relatively large flowing and standing waters, and until recently those polluted by point sources. Consequently areas of high conservation interest tend to be understudied, and defining reference conditions, as required by current legislation, is difficult to achieve.
• 2. In order to address this imbalance, water samples have been collected and analysed once in each of four seasons during 2003 from 72 locations within a 100 km² area of the oligotrophic River Spey catchment in NE Scotland. The sampling design included examples of running water (headwater streams and the main rivers) and standing water (lochs, lochans, pools, ditches, backwaters, bogs). Altitude ranged from 220 to 980 m and incorporated a climatic regime from cool temperate to sub‐alpine. Each sampling campaign targeted low‐flow conditions to evaluate steady‐state nutrient concentrations.
• 3. Concentrations of the major soluble nutrients nitrogen and phosphorus demonstrated high spatial and temporal variability, with soluble organic and molybdate unreactive forms generally being dominant. Concentrations of ammonium‐N, nitrate‐N and soluble reactive phosphorus were extremely small, with 50% of samples falling below 8, 5 and 1 µg L^?1, respectively, during spring and summer.
• 4. Sampling sites were grouped either by water‐body type or by the properties of their immediate biophysical zone. Together these two groupings explained 33–38% of the variance in water chemistry. Certain changes were detectable across most habitats and biophysical zones.
• 5. A decline in the concentration of nitrate that occurred in reaches downstream from certain headwater streams draining the mountain areas indicated the potential for its within‐stream utilization. Inorganic N dynamics differed between small streams and large rivers.
• 6. Landscape‐scale patterns were recorded in spring and summer nutrient availability with inorganic N and P thresholds (arbitrarily defined) of 10 and 1 µg L^?1, respectively.

Copyright © 2006 John Wiley & Sons, Ltd.     

花生氮磷钾肥料效应函数模型的研究

本试验是采用最优设计进行的N、P、K三因素肥料试验,试验结果获得了三个因素与产量间相互关系的函数模型。本文分析了三个因素的产量效应及其交互作用,分别计算出最高产量、最大施肥利润以及不同产量水平最低成本的施肥量及其配比,为合理施肥提供依据。