关于联合办学的几点思考

开展多种形式的联合办学是高等教育适应经济、科技和社会发展的需要。突出农专特色，积极开展联合办学，培养不同层次、不同类型的实用人才是农专教育教学改革的重点。发展联合办学，必须坚持解放思想、更新观念、注重质量、讲究实效。     

The use of getting up and lying down movements in the evaluation of cattle environments

The aim of this review is to find out if getting up and lying down movements can be used as one of several parameters when evaluating different cattle environments. Getting up and lying down movements are performed according to innate movement patterns. An unsuitable environment can cause these movements to become incomplete or abnormal and so lead to injuries. Physiological measurements at lying down show a greater change in tethered cattle than in cattle kept on deep litter. In short stalls the use of certain types of tethers and the height of the manger edge affect the normal getting up and lying down movements. Unsuitably designed cubicles in loose housing systems can lead to changed movement patterns. Calves and fattening bulls have fewer lying down and getting up movements and longer lying intervals on slatted floors than on deep litter. Calves kept in small individual crates carry out a large percentage of their lying down and getting up procedures abnormally. In this review it is shown that it is possible to make improvements in the environment of cattle by using results from studies of these behaviour patterns. The conclusion is that getting up and lying down movements can be used as one of several parameters when evaluating different cattle environments.     

A short note on the horizontal and vertical movements of a whale shark, Rhincodon typus, tracked by satellite telemetry in the South China Sea

Whale sharks, a global migratory species, are often reported entangled in fishing nets in coastal areas of China. The effectiveness of conservation measures has been constrained by very limited knowledge on their movements and preferred habitats in the coastal areas of China. For the first time, we tracked the movements of 2 whale sharks by satellite telemetry in Mainland China. The tracking results of 1 whale shark revealed that it travelled in the South China Sea in a south-eastern direction, parallel to the eastern coast of Vietnam. Total distance travelled was 1018 km, in approximately 74 days, with a mean speed of 14 km per day. It appeared to head towards the cool upwelling zones in southern Vietnam at the time of the tag's detachment. In our study, it was observed that this whale shark was a surface dweller and spent approximately 45% of its time above 10 m water depth and 90% of its time above 50 m depth. It also tended to stay in water temperatures between 27 and 30 °C, and was rarely recorded in water below 20 °C. This preliminary study indicates the importance of shallow waters as the foraging habitat for whale sharks, and has implications for their management and conservation.     

基于变异函数的油松毛虫虫情监测点布点方法研究

通过变异函数工具研究了喀左县油松毛虫Dendrolimus tabulaeformis发生的空间异质特征。变异分析表明:喀左县油松毛虫发生变异函数的理论模型符合球状模型,空间变异受结构因子(C)的影响占98%,受随机因子(C0)的影响占2%,确定性因素对空间异质性的影响远大于随机因素,其变异具有强烈的空间相关性。油松毛虫发生程度最大相关距离为7.98 km。每40.7 km2设1个监测样点,"品"字型均匀布设,基本能满足油松毛虫发生分布估计要求。     

论森林资源变档工作在林业建设中的作用

文章根据辽宁省5年来森林资源变档工作实践,论述森林资源变档工作,管理模式、内容、在林业建设中的作用、及存在的问题、提出相应对筞。森林资源变档以小班为单位,通过科学技术手段,实现了每年更新一次森林资源数据,实现了从静态管理到动态管理转变。为各级政府、林业主管部门、及森林经营单位制定林业方针政策,编制林业规划设计、指导林业生产提供科学基础数据,为调整林业政策、提高林业管理水平,提供最新的科学依据。     

水土保持行政处罚工作刍议

针对《行政处罚法》颁布实施前后,水行政主管部门应如何根据自身实践做好相关的各项工作,提出了个人见解,以规范水土保持行政处罚行为,力求在水土保持行政执法中做到有理、有据、合法、避免执法违法现象存在,确保水土保持行政执法不断深入。     

Vertical habitat use of sailfish (Istiophorus platypterus) in the Atlantic and eastern Pacific,derived from pop‐up satellite archival tag data

Vertical habitat use of sailfish (Istiophorus platypterus) was evaluated using pop‐up satellite archival tag data from the eastern tropical Atlantic, western North Atlantic, and eastern tropical Pacific. Data included Argos transmitted depth, temperature, and light level frequency histograms binned at 1–8‐h intervals, and four recovered pop‐up satellite archival tags that provided high resolution archival data recorded at 30‐s intervals. We tabulated the proportions of time spent within each degree of water temperature relative to the surface temperature (Delta T) and proportions of time at temperature, as these are major input variables for habitat standardization models used in stock assessment procedures. Frequency distributions were calculated for daylight, darkness, and twilight for each of the three regions and for all regions combined. Vertical habitat envelopes indicated greater use of deeper strata in the western North Atlantic, compared to the hypoxia‐based habitat compressed regions of the eastern Atlantic and Pacific. However, there were no significant differences in Delta T distributions when comparing the three regions, affirming this metric for its application in habitat standardization models.     

Designing satellite tagging studies: estimating and optimizing data recovery

Satellite telemetry is used routinely to collect and transmit movement, behaviour and environmental data from free‐ranging animals. Satellite tags (hereafter SATs) are essential for collecting in situ data from animals where manual retrieval of a data logger is impossible. The collected data is fundamental for scientific and many management applications. However, the amount of data a SAT can transmit is limited by its battery life, transmission opportunities, bandwidth and satellite coverage. When designing a SAT study, these factors should be taken into account to ensure that limited transmissions are utilized as effectively as possible. In this paper we present a theoretical discussion of the factors that influence the data transmission and present tools for designing effective SAT studies. We calculate the optimal sampling period for the tag given its expected lifetime and regional variation in satellite coverage. Taking these factors into account allows prediction of the expected number of tags required to meet targets for a deployment. These methods are applied to a case study of a highly migratory pelagic fish tagged with popup archival satellite tags (PSATs). Our findings will be useful for SAT study design in general and demonstrate an approach which can reduce the ad hoc nature of SAT deployments.     

旋转导向管新型喷动床空气动力学特性研究

为放大常规喷动床,提出了“旋转导向管喷动床”新概念,设计并安装了两种旋转导向管喷动床。以小麦为原料,测定了旋转导向管新型喷动床的空气动力学特性,包括不同导向管在相同导喷距下风速与床层压降关系、导喷距对风速与床层压降关系的影响和旋转导向管喷动床的循环量等性能。研究结果表明：采用旋转导向管后物料可洒布在整个床层截面上,因此可放大喷动床的直径;在喷动发生后,旋转导向管新型喷动床的床层压降与普通导向管喷动床的床层压降差异较小;导喷距影响最大床层压降,采用调节导向管安装高度的方法,可不考虑最大喷动压强,而根据正常喷动时的压降选用风机。