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991.
众所周知鲳科鱼类均为重要的经济种类,在中国沿海仅见鲳属(Pampus)鱼类分布,而低鳍鲳属(Peprilus)和真鲳属(Stromateus)则分布于大西洋和东太平洋。本研究采用形态学和DNA条形码技术对海南、广西和广东水产品市场上出现的“南鲳”进行物种鉴定,同时下载该物种的COⅠ基因同源序列进行比较分析,并纠正GenBank中的错误序列。研究结果显示“南鲳”学名实为中间低鳍鲳(Peprilus medius),为冰冻进口货品,在我国沿海无该物种的分布报道,其与国内已知的6种鲳属鱼类在鳃耙、背鳍、臀鳍等外部形态上存在明显的差异,在COⅠ基因水平上与鲳属鱼类遗传距离为 0.138,分化于中新世晚期。本研究可为水产品市场种类鉴定提供借鉴,也为鲳科鱼类的研究和海洋鱼类分类学提供基础数据和参考。 相似文献
992.
对2021年第6号台风“烟花”的主要特点与路径预报重大调整过程中出现的难点问题进行分析和研究,得出主要结论如下。(1)“烟花”移动缓慢,是首个两次登陆浙江的台风,在浙北和杭州湾附近地区长时间滞留。(2)降雨影响范围广、累计降雨量大、大风持续时间长。(3)反映出来的重要难点问题有:当多数模式预报出现一致的偏差时,预报员难以做出订正,有必要开展对模式中台风重要影响系统(高空冷涡、热带对流层上层槽等)的预报检验工作;台风移速缓慢的定量程度难以把握,需要通过总结历史个例和敏感性试验等方法开展东侧台风对西侧台风移动缓慢影响的定量研究;西风带槽/脊对副热带高压退/进快慢的定量影响把握困难,影响北上台风转向点的预报,特别是当不同模式有分歧的时候预报难度更大。 相似文献
993.
降水是全球能量/水循环中的重要过程。本文着重分析 FY-3 气象卫星降水探测能力,展望风云卫星后续规划中降水探测技术的发展前景。分析表明,以 FY-3 降水星为主星,与其他 FY-3 极轨卫星组成的 FY-3 气象卫星降水探测体系,在设计层面上,从载荷类型、数量、通道设置等方面均优于由美国发起并已在轨运行的全球降水测量(Global Precipitation Measurement,GPM)计划核心星的设计性能。FY-3 降水星设计装载 Ka / Ku 双频降水测量雷达,卫星轨道设计覆盖南北纬 50°范围内的中低纬地区,对影响我国区域的台风暴雨等强对流天气系统结构具有三维探测能力。FY-3 气象卫星星座的降水探测能力为气象防灾减灾提供了基础支撑。 相似文献
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995.
Research on ecosystem service consumption not only helps to reveal the utilization intensity and management level of the ecosystem in Guilin, but it also provides a scientific basis for ecosystem investment, trade, subsidies and taxation by the Guilin government departments. Based on household survey data of urban and rural ecological consumption, the physical quantity accounting method is adopted for multivariate statistical analyses, such as analysis of variance and multiple comparison. This analysis reveals the differences and changes in the consumption level, consumption structure and consumption pattern of the main ecological products in Guilin among the various counties. The results fit into four main themes. (1) The annual per capita consumption of the main ecological products in Guilin varies either extremely significantly or significantly among the counties, but the consumption level of ecological products varies according to the type of products. There are significant or extremely significant differences in the annual per capita consumption of cereals, melons and fruits, pork, poultry, beef and mutton, fresh eggs and milk between urban and rural residents. (2) There are extremely significant differences in the annual per capita consumption of fruits, pork, poultry, beef and mutton, fish, fresh milk and vegetable oil among urban residents in different counties. There are also extremely significant differences in the annual per capita consumption of cereals, pork, poultry and alcohol among rural residents in different counties, and significant differences in the annual per capita consumption of fresh eggs and milk. The consumption level of ecological products by urban and rural resident varies with the type of products. (3) The ecological consumption patterns of all counties in Guilin mainly follow the “cereal + vegetable + fruit + meat” pattern for urban residents and the “cereal + vegetable + meat” pattern for rural residents (except for the rural residents in Pingle, which show the “cereal + vegetable” pattern). The consumption structure of urban residents is better than that of rural residents. (4) There is a large gap between the ecological consumption of urban and rural residents in Guilin and China's recommended standards, except for cereals and meat. The main problems are excessive meat intake, and insufficient intake of dark vegetables, fruits, eggs, milk and fish. Therefore, we should make full use of forestland, grassland, water and other resources in the area, and vigorously develop fishery, fruit and vegetable production and herbivorous animal husbandry to meet people's ecological needs for dark fruits and vegetables, eggs, milk and fish in Guilin City. 相似文献
996.
Wang Caixia Wang Min Chen Binbin Qin Wenli Lin Lidong Dai Chuanjun Yu Hengguo Li Renhui Zhao Min Ma Zengling 《中国海洋湖沼学报》2021,39(6):2237-2251
Journal of Oceanology and Limnology - Harmful algal bloom (HAB) is an ecological disaster to local mariculture. At present, its impact on macrophytes has not been well studied. In this study, we... 相似文献
997.
测定14周龄贵妃鸡的体尺与屠宰性能相关指标,通过简单相关和典型相关分析,研究贵妃鸡体尺与屠宰性能的相关关系。结果表明:贵妃鸡公母鸡14周龄体质量分别为1 120.67 g和845.33 g,公鸡的体尺和屠宰性能(全净膛质量除外)均高于母鸡(P0.01);体尺与屠宰性能指标间存在不同程度的相关性,其中有2对典型相关系数达到了显著水平(P0.05),典型相关系数分别为0.985和0.824,体尺和屠宰性能的相关性主要由胫围、龙骨长、屠体质量、体质量和半净膛质量间引起;贵妃鸡可通过体尺选择提高屠宰性能。 相似文献
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1000.
Land cover change affects surface radiation budget and energy balance by chang- ing surface albedo and further impacts the regional and global climate. In this article, high spatial and temporal resolution satellite products were used to analyze the driving mechanism for surface albedo change caused by land cover change during 1990-2010. In addition, the annual-scale radiative forcing caused by surface albedo changes in China's 50 ecological regions were calculated to reveal the biophysical mechanisms of land cover change affecting climate change at regional scale. Our results showed that the national land cover changes were mainly caused by land reclamation, grassland desertification and urbanization in past 20 years, which were almost induced by anthropogenic activities. Grassland and forest area decreased by 0.60% and 0.11%, respectively. The area of urban and farmland increased by 0.60% and 0.19%, respectively. The mean radiative forcing caused by land cover changes during 1990-2010 was 0.062 W/m2 in China, indicating a warming climate effect. However, spatial heterogeneity of radiative forcing was huge among different ecological regions. Farmland conversing to urban construction land, the main type of land cover change for the urban and suburban agricultural ecological region in Beijing-Tianjin-Tangshan region, caused an albedo reduction by 0.00456 and a maximum positive radiative forcing of 0.863 WIm2, which was presented as warming climate effects. Grassland and forest conversing to farmland, the main type of land cover change for the temperate humid agricultural and wetland ecological region in Sanjiang Plain, caused an albedo increase by 0.00152 and a maximum negative radiative forcing of 0.184 W/m2, implying cooling climate effects. 相似文献