短梳角野螟的形态描述及幼虫虫龄判断     

李小敏  刘君昂  欧阳博文  董文统  周斌  周国英 《植物保护》2017,43(3):136-142

短梳角野螟Meroctena tullalis(Walker)是为害红花天料木Homalium hainanense Gagnep的重要食叶害虫,其形态描述和幼虫准确分龄是开展害虫生物生态学及林间防控研究的重要依据。本文采用林间采样与室内饲养相结合的方法,首次对短梳角野螟卵、幼虫、蛹和成虫的形态及生活习性和生活史进行调查和描述。并通过测定头宽、头长和体长3项分龄指标,利用SPSS Statistics19.0统计软件对数据进行频次分析,结合戴氏法则和线性回归等试图探究准确划分幼虫虫龄的可靠方法。结果表明:短梳角野螟幼虫随龄期增长,幼虫颜色由浅黄绿色逐渐变为深绿色,头部由肉色逐渐变深,最后形成外围红褐色中间深肉色。通过频次分析统计,测得短梳角野螟幼虫虫龄为5龄;头宽可作为最佳分龄指标,且头宽测量指标平均值自然对数与幼虫龄期呈线性关系(y=0.181 6x-0.602 3,R2=0.999 1)。头长和体长统计检验,符合戴氏法则,但频次分析5个峰值不是很明显,且有部分区域重叠,只能作为划分虫龄的辅助指标。本研究确定了短梳角野螟各虫态的形态特征及划分幼虫龄期的最佳指标,以期为该虫林间防治提供生物学依据。  相似文献   

Soil water dynamics and deep soil recharge in a record wet year in the southern Loess Plateau of China   总被引：2，自引：0，他引：2  

Wenzhao Liu  X.-C. Zhang  Zhu Ouyang  Jun Wang  Rui Wang 《Agricultural Water Management》2010,97(8):1133-1138

Terrestrial water cycles are influenced by hydrologic and textural properties of the deep loess layer in the Loess Plateau. Analyses of soil water profile distributions are needed to understand the regional water cycle processes and to guide agricultural production and sustainability. The objective of this study was to quantify the extent of deep soil water recharge and soil water profile dynamics during 1987-2003, especially in a record wet year of 2003, in common cropping systems in a semiarid-subhumid region of the southern Loess Plateau. The Chinese Ecological Research Network (CERN) site and a long-term rotation experiment site in a flat tableland were selected for this study. Soil moisture profiles were measured by a neutron probe to a depth of 6 m in 2003. The precipitation of 954 mm at the Changwu County Meteorological Station in 2003 was 63.4% higher than the long-term average (584 mm), and was a record high since 1957. Although cropping systems affected deep soil water recharge, the persistent dry soil layer formed between 2- and 3-m depths in croplands, resulting from many years of intensive cropping, was fully replenished in all cropping systems in 2003. Further frequency analysis indicated that the desiccated layer between 2- and 3-m depths would be fully recharged at least once in about 10 years for all existing cropping systems excluding continuous alfalfa. This finding should alleviate concerns about the formation of a permanent deep-soil desiccation layer as well as its potential impact on the long-term sustainability of the existing intensive cropping systems in the region.  相似文献   

Minimally invasive evaluation of the anaesthetic efficacy of MS‐222 for ornamental discus fish using skin mucus biomarkers     

Ming‐Yan Ouyang  Bin Wen  Huan‐Chao Ma  Chen Chen  Jian‐Zhong Gao  Yuan Zhang  Zai‐Zhong Chen 《Aquaculture Research》2020,51(7):2926-2935

Skin mucus has been demonstrated to provide stress biomarkers for evaluating the physiological status, providing new convenient and non‐invasive methods to detect stress response in fish. Here, we investigated the anaesthetic efficacy of tricaine methanesulphonate (MS‐222; 75–115 mg/L) for discus Symphysodon aequifasciata (34.27 ± 4.46 g; 8.10 ± 0.59 cm) using skin mucus stress biomarkers. The induction time, recovery time and respiratory frequency were also determined. According to the criteria for anaesthesia and recovery, discus fish to reach stage A3 (deep anaesthesia) within 3 min and to reach stage R4 (full recovery of normal behaviour) within 5 min were observed at 95–105 mg/L MS‐222. Respiratory frequency increased first and then decreased during MS‐222 exposure and increased after recovery. At 10 min after deep anaesthesia, a lower mucus glucose was only observed at 115 mg/L MS‐222. No change in mucus cortisol and increased lactate were observed in all treatments. Increased mucus protein was observed at 75, 85 and 95 mg/L MS‐222. At 10 min after recovery, increased mucus glucose and decreased mucus protein were observed at 85, 95 and 115 mg/L MS‐222, but increased mucus cortisol only at 115 mg/L and lactate only at 75 and 105 mg/L MS‐222. At 24 hr after recovery, mucus glucose returned to the initial level only at 75, 95 and 105 mg/L MS‐222, while cortisol at 75 and 85 mg/L and protein and lactate at 75 mg/L respectively. Overall, the effective dose of MS‐222 for discus fish has been suggested to be 95–105 mg/L.  相似文献   

不同年龄细鳞鱼的繁育效果     

马瑞祥  王茂林  文逊智  刘钢  李洪明  孟照勇 《河北渔业》2019,(7):21-23,42

研究了不同年龄组(3~8龄)细鳞鱼(Bachymystax lenok Pallas)亲鱼的繁育效果,分析其繁育主要技术,包括亲鱼培育、繁育技术、受精卵孵化、鱼苗培育等,结果发现,5~6龄和7~8龄细鳞鱼产卵量没有明显差异,产卵量、孵化率、出苗率均较高,繁殖效果明显好于3~4龄亲鱼。  相似文献   

Microsatellite analysis of genetic diversity and genetic structure of the Chinese freshwater mussel Solenaia carinata (Bivalvia: Unionidae)          下载免费PDF全文

Chunhua Zhou  Hongxiu Ding  Wenjing Yang  David T. Zanatta  Shan Ouyang  Xiaoping Wu 《水产资源保护:海洋与淡水生态系统》2018,28(1):37-44

农业科研单位科技扶贫模式研究     

欧阳红军  赵瀛华  覃新导  刘海清 《农业科研经济管理》2016,(4):7-10

科学技术是脱贫致富的关键,发展产业是实现脱贫的根本之策。农业科研单位是脱贫攻坚工程的主力军,如何实现精准扶贫,创新扶贫模式,探索帮扶措施对于打赢扶贫攻坚战意义非常重大。文章在归纳中国热带农业科学院科技扶贫模式的基础上,提出了一系列做大做强科技扶贫工作的建议。  相似文献   

Evaluation of the antimicrobial activity of 9-oxo-agerophorone against soil borne pathogens     

Liu  Xiaoman  Ouyang  Canbin  Li  Yuan  Yang  Dongsheng  Fang  Wensheng  Yan  Dongdong  Guo  Meixia  Cao  Aocheng  Wang  Qiuxia 《植物病害和植物保护杂志》2016,123(4):163-170

Journal of Plant Diseases and Protection - 9-Oxo-agerophorone is a cadinene sesquiterpene, isolated from the leaves of Eupatorium adenophorum. This study evaluated the antimicrobial activity of...  相似文献   

东方百合试管鳞茎培育方式的比较   总被引：1，自引：0，他引：1  

蔡宣梅  张洁  郭文杰  欧阳桐娇  方少忠 《中国农学通报》2016,32(16):83-86

为促进试管鳞茎抽薹,缩短其形成商品球的时间,以东方百合试管鳞茎为材料,采用不同的培育方式,研究其品质与抽薹率的影响。对东方百合试管鳞茎不同培育方式的比较研究,结果表明：瓶苗冷藏或用基质冷藏,冷藏后的试管鳞茎生理变化规律相同,即淀粉含量、蛋白质含量均降低,可溶性糖含量和还原糖含量均升高;而用基质冷藏或用瓶苗冷藏,暗培养的试管鳞茎抽薹率都高于光照培养;采用暗培养或光照培养,基质冷藏的抽薹率都高于用瓶苗冷藏。工厂化生产百合种苗时宜采用暗培养试管鳞茎结合种前用基质冷藏的培育方式。  相似文献   

投入式液位计在液肥液位检测中的应用     

周文娟  欧阳斌林  雷冬阁  赵健评  任雪  孙文峰 《农机化研究》2016,(2):218-221,248

针对当前液态施肥机在液肥的精确及定量控制等方面存在的不足,以单片机作为控制核心,采用投入式液位传感器进行数据采集,将液位的变化转换成电压变化,再利用A/D将模拟量转化成数字量;同时,通过单片机处理将电压值换算成相应的液位高度值及容量值并显示,并用Mat Lab分析试验数据。结果表明:液位高度值各容量值测量误差均满足实际要求,可应用于液态施肥机。  相似文献   

中国渔业专利技术布局分析——以中国水产科学研究院为例   总被引：3，自引：3，他引：0  

闫雪  欧阳海鹰  陈柏松  胡婧  曾首英 《中国农学通报》2015,31(20):254-260

为分析渔业领域授权专利的特点,为进一步优化产业布局、促进渔业知识产权运用、引导产业创新提供借鉴。以中国水产科学研究院为例,采用定量的方法,分析了渔业专利的时间分布、IPC技术类别、主题词、研究领域、法律状态等。研究发现,渔业专利发展可分为3个阶段,分别为缓慢增长期,快速增长期和波动增长期。渔业领域专利在传统水产养殖技术和捕捞方面布局广泛,如水产育种,饲料加工,深水网箱等方面,而在工业化水产养殖技术略显薄弱。中国渔业专利的授权率高于总体专利授权率,但专利成果存在转移转化率低、专利维持年限较短、技术走出去不足等问题。  相似文献