减氮条件下密度对望两优361产量的影响

为探索减氮条件下密度对望两优361产量的影响,2018年在马庙镇进行了该试验。试验结果表明：怀宁县单季稻施肥量应为：N:P:K=13.5:5.4:10.8。在此施肥量的基础上： 1.5万穴/667m_²为最佳移栽密度。     

基于landsat8的贵州省2015年农业干旱监测研究

在全球气候变暖背景下,干旱普遍发生,而农业干旱对国民经济发展的影响尤为明显,同时农业干旱还威胁着国家的粮食安全和生态安全。基于贵州省2015年不同季节的landsat8 OIL遥感数据,利用影像数据所获取的植被覆盖指数和地表温度数据,拟合植被指数(NDVI)和地表温度(LST)的特征空间,设计得到贵州省2015年春、夏、秋、冬四个不同季节的不同的土壤湿度,将TVDI作为监测农业干旱状况的指标,得到贵州省2015年的农业干旱时空分布图。结果表明,土壤含水率的高低与植被覆盖和地表温度有关,且TVDI更适宜中等植被覆盖的土壤湿度反演。贵州省2015年全年旱情较缓,各地区均不存在春旱或伏旱,只有冬季绝大部分地区土壤含水率较低,更有力地促进了农业干旱的发生。因此,对农业干旱的监测研究为贵州省农业干旱的监测管理提供有力依据,为今后减少农业干旱的影响和进一步促进农业社会经济可持续发展具有重要的现实意义。     

自然保护地环境教育实践与研究现状

环境教育是多学科融合的激发人们环境保护意识、培养正确环境价值观的教育。国际上自然保护地环境教育研究主要集中在环境教育内容和形式、环境教育效果评价及其影响因素分析、环境教育监测和法律体系完善等领域。在实践方面，环境教育内容和形式不断丰富，出现相对多样化的环境教育模式和较为健全的环境教育评价与法治管理体系。典型的有美国黄石公园设置的少年巡逻员岗位项目、英国的野外环境教育培训基地和日本的生态自然体验露营地等。我国自然保护地环境教育研究关注了国外相关理论与实践，侧重于从宏观层面对我国环境教育提出原则性、策略性的建议等。文中在分析国际自然保护地环境教育研究与实践的基础上，结合我国自然保护地环境教育现状及存在的问题，提出了完善环境教育内容和形式、建立健全环境教育评价和法律体系等发展建议。     

浅谈楼房养猪除臭技术设计与应用

楼房养猪相较于传统平房养猪,占用面积更小,可节省用地60%以上。楼房养猪同时方便集中管理,易于采光通风和保暖;但是楼房养猪也有明显的缺点,相较于传统的平房养猪,楼房养猪作为集约化、规模化、现代化养猪的集中表现模式,建造及运营维护成本相对较高,消毒及防疫工作较为困难。高楼环境易于通风的同时,猪舍的污染问题也更加突出。猪舍给空气带来的污染不仅会影响猪舍内外的空气质量,同时还会影响猪只的繁殖、生长和发育,并将会对养殖人员与附近居民的身体健康产生重要影响。所以,必须采取相应完善的系统科学措施,处理楼房养猪中的空气除臭问题,保证生猪生活环境的清洁。文章通过结合平房养猪以及楼房养猪的特点,浅谈一下楼房养猪的除臭技术的设计与应用。     

The ecosystem services concept: a new Esperanto to facilitate participatory planning processes?

Landscape Ecology - Several case studies investigated the role of ecosystem services in participatory planning processes. However, no systematic study exists that cuts across a large number of...     

Effect of a supply of raw or extruded rapeseeds on digestion in dairy cows.

The influence of extruded oilseeds on total tract digestibility and ruminal digestion in dairy cows was studied in three cows fed a hay-concentrate (60.5/39.5; 3.7% fatty acids in diet on DM basis) control diet (C) or the same diet supplemented with raw (R) or extruded (ER) rapeseeds (8.0% fatty acids in diet DM). The experimental design was a 3 x 3 Latin square design. Compared with diet C, diets containing rapeseed decreased ruminal OM digestibility (9.5%, P less than .10) and increased (P less than .05) the proportion of propionate in ruminal fluid VFA. Extrusion had no effect on DM and OM total tract digestibilities and increased (P less than .10) N digestion. Microbial N flow at the duodenum was calculated taking into account solid-adherent bacteria (SAB) and liquid-associated bacteria (LAB). Duodenal flows of total, SAB, and LAB of OM and N did not change with diet. Extrusion of the rapeseeds did not modify (P less than .10) the proportion of bacterial N at the duodenum and had no effect on crude fiber digestibility. This trial demonstrates that rapeseeds in hay-based diets can be fed at levels of up to 14% of the diet without adversely affecting crude fiber digestibility.     

Factors affecting skim milk progesterone assay results.

Five studies were performed to determine factors affecting progesterone concentration in skim milk. Results of the first study indicated that progesterone concentration was higher in skim milk of samples kept 16 hours in an ice bath (0 C) than of those left at room temperature (21 C). In the second study, this temperature effect was found to be reversible, with skim milk progesterone concentration increasing when whole milk samples were cooled prior to centrifugation. In the third study, [3H]-labeled progesterone was used to determine the relationship between fat content of foremilk (the first milk obtained from the teats), midmilk (milk obtained midway through milking), and strippings (milk obtained immediately after milking machines have been removed) samples and temperature (4 C and 21 C) on the percentage of progesterone in the skim milk fraction. The relationship between percentage of butterfat and percentage of progesterone in skim milk was linear when the log of these variables was used for calculations. In the fourth study, assayable progesterone in the skim milk fraction of foremilk, midmilk, and strippings was affected by temperature. In the fifth study, a multiple-regression procedure was used to determine the amount of variation in percentage of radioactive progesterone in the skim milk fraction. Independent variables (whole milk butterfat and temperature of incubation [1, 3, 13, 22, 37, and 50 C]) and the natural log of each variable, were entered into a stepwise multiple-regression analysis.(ABSTRACT TRUNCATED AT 250 WORDS)     

Ultrastructural observations on autolytic changes of atrial specific granules in pig heart.

The progressive autolytic changes of atrial specific granules (ASGS) up to 24 hours after death were studied electron microscopically. Tissue samples taken from the left auricular myocardium of four pig hearts at 0, 0.5, 1.5, 3.5, 6, 12 and 24 hours post mortem were fixed for 24 hours by immersion in 2.5 per cent cacodylate buffered glutaraldehyde (pH 7.4). Two pig hearts were kept at 20 degrees C and two at 4 degrees C. Although typical autolytic changes were seen in many organelles, no remarkable modifications in aspect, distribution, content and diameter of ASGS were observed in all samples. The results of this study indicate that ASGS are not morphologically affected by the autolytic processes, at least during the first 24 hours. Hence, the electron microscopic evaluation of ASGS does not need a particular fixation method such as perfusion. This may eliminate technical problems when slaughterhouse material is used.     

聚丙烯酰胺凝胶电泳法鉴定禽呼肠孤病毒

从感染禽呼肠孤病毒的细胞中,以SDS和酚提取病毒核酸,通过聚丙烯酰胺凝胶电泳(PAGE)法将分节段的核酸分开,经银染色显示,呈3-3-1-3分布,此法可用于禽呼肠孤病毒的快速检测、鉴定。同样方法未能使传染性法氏囊病毒核酸显示。     

一类耗散非线性波动方程初边值问题整体解的存在与非存在性

本文考虑一类耗散非线性波动方程的初边值问题。用半(?)方法和先验估计论证了该问题小初值下在时间大范围的可解性、唯一性;并用凸性方法证明了(?)当条件下该问题的解在有限时间内发生爆破现象。