落叶松种子活力测定和田间育苗对比试验研究

用直立板发芽器对大兴安岭地区8个种批落叶松(Larix gmelini Rupr)种子活力进行了研究:(1)测定了种子发芽指数、活力指数和幼苗干重;(2)按幼苗高度和幼根、子叶初现状况、再用苗全长的标准差将落叶松幼苗分为5级,最后统计出幼苗健壮率和实验室出苗率(国际发芽率标准),从而改进了幼苗活力分级标准;(3)筛选出提高落叶松种子活力最佳预处理方法——种子预湿冷层积14天。通过8个种批落叶松田间育苗对比试验,得出种子预湿冷层积14天,育苗效果明显优于对照组。各种批的种子活力测定结果、幼苗活力分级结果和田间育苗效能是一致的。     

基于改进MaxViT的辣椒病害识别分类方法

为实现复杂环境下辣椒病害的精准识别和分类,设计了一种适用于辣椒病害识别分类的方法。以辣椒在生长过程中常见的6种病害为分类研究的对象,使用数据增强的方法扩充数据集,提出一种基于MaxViT改进的MaxViT-DF模型,将MaxViT模型中的普通卷积替换为可变形卷积,使模型在提取特征时能更贴近复杂环境下的识别目标;同时在MaxViT模型施加注意力时引入特征融合模块,提高模型的全局感知能力。结果显示,改进的MaxViT-DF模型识别分类准确率达到98.10%,对6种辣椒病害的分类精度均高于95%。与ResNet-34、EfficientNetv2和VGG-16等模型相比,改进模型在收敛速度和分类精度上具有明显优势。以上结果表明,MaxViT-DF模型能够对不同种类的辣椒常见病害进行有效的分类识别。     

The controversial histologic classification of canine subcutaneous whorling tumours: The path to perivascular wall tumours

Subcutaneous spindle cell tumours characterized by whorling growth patterns are common in dogs and are identified as a distinct entity. These tumours were misnamed as hemangiopericytomas (HPCs) because of some minor morphological parallels with their human counterparts. In veterinary medicine, the cell of origin of HPC has been under debate for a long time. Some authors have suggested a perivascular origin while others a perineural one. The evidence of the orientation of the neoplastic cells around the vessels and the expression of contractile proteins supported a perivascular origin while S100 expression and an inconsistent vascular connection supported a perineural origin. Despite the morphological similarities with peripheral nerve sheath tumours in humans, the perineural origin was supported mainly by the expression of markers with low specificity. On the contrary, the majority of studies have supported the perivascular origin of ‘old’ canine HPC. Since a variable degree of myoid‐pericytic differentiation was described, the term perivascular wall tumours (PWTs) were suggested to substitute HPC. Once the diagnostic criteria of PWTs were defined, the clinical behaviour and prognostic variables were investigated, demonstrating differences as compared with the group of canine soft tissue sarcomas (STSs) in general. PWTs are less aggressive, mostly locally invasive, and rarely metastasizing. Their behaviour seems to be less influenced by histological grade, suggesting that canine STSs are heterogeneous. The study of the biological behaviour of specific STS tumour types may be valuable in detecting differences which have passed unnoticed when STSs have been studied concomitantly.     

dBASE—Ⅱ在水土保持中的应用

介绍了为建立水土保持数据库而设计的“dBASE—Ⅱ应用系统”。研究表明,用“dBASE—Ⅱ应用系统”能快速地进行水土保持规划所需数据的动态存储和统计检索,能快速地完成荒溪分类,还可与土地利用规划等应用程序连接使用。     

耐冬山茶叶组织结构与品种分类研究

对14个耐冬山茶品种的叶组织结构进行了比较解剖研究,探讨了叶组织结构与品种分类的关系.结果表明,耐冬山茶叶表皮、气孔、栅栏组织、海绵组织、晶细胞等可以作为品种分类的依据.     

基于数字照片特征的小麦覆盖度自动提取研究

植被覆盖度是农作物的一个重要参数.本文利用数字相机获取田间小麦冠层影像,通过基于特征的自动影像分类估测覆盖度和叶面积指数.在分析数字影像中小麦和背景特征的基础上设计了小麦覆盖度的提取算法,并开发了一个对影像进行自动分类提取小麦覆盖度的程序包.该方法综合 ISODATA无监督分类的快速、操作简便的优点和最大似然法监督分类精度高的优点,分类精度达90%左右.此外还分析了自动分类的误差来源,提出了改进办法,指出了自动分类方法的适用范围.     

Evaluation and reasonable exploitation on the natural view resources of Lushan Mountain scenic spot

The paper carried on the classified and rating evaluation primarily on natural landscape resources in Lushan Mountain. According to the evaluation, exploiting and utilizing the situation of scenic spot natural landscape resources, some reasonable advices were given on further exploiting Lushan Mountain natural scenic spot, expecting that it could supply some theoretical references for the natural landscape resources sustainable development in Lushan Mountain in the future.     

西藏米拉山区植物资源特征分析

为深入研究西藏米拉山区植物资源的分布和多样性,对该区植物资源作了系统调查.西藏米拉山区有维管植物86科324属765种,其中蕨类植物15科20属37种,裸子植物有3科7属12种.种类组成趋向于集中在少数科内,区系优势现象明显,反映出米拉山自然环境的特殊性和区系的过渡性.根据植物的用途,将米拉山区的植物资源分为11类,并提出了该区植物资源保护和可持续利用的策略措施.图1表2参12     

薄荷属植物的数量分类

选取30个主要性状,对薄荷属6个种38个居群进行了数量分类研究。Q型聚类分析结果表明,叶的平或皱是较稳定的,可以作为薄荷属植物分类的主要标准。按照"欧氏距离远近"原则,Q型聚类分析可以比较理想地将38个居群在L3=0.618水平上分为5个系,即日本薄荷系、灰薄荷系、薄荷系、唇萼薄荷系、椒样薄荷系,其中日本薄荷系又可分为日本薄荷亚系和皱叶留兰香亚系,椒样薄荷系又可分为椒样薄荷亚系与留兰香亚系。R型聚类分析基本上能反映性状间的相关性,可以为今后进一步进行性状的取舍和观测提供定量化的依据。