FTIR结合小波变换分析鉴别8种根茎类作物     

任静  刘刚  赵兴祥  赵帅群  欧全宏  徐娟  胡见飞 《中国农学通报》2014,30(52):17-24

为了区分鉴别8种根茎类作物,通过采用傅里叶变换红外光谱(FTIR)结合小波变换(WI)、主成分分析(PCA)和聚类分析(HCA)的方法,测试研究了8种根茎类作物40个样品的红外光谱。结果表明：8种样品红外图谱相似,但在1800~700 cm^-1范围内,红外光谱的峰位、峰形及吸收强度差异明显。对此范围内的原始红外光谱进行连续小波和离散小波变换。提取连续小波变换的第15层系数和离散小波变换的第5尺度细节系数数据,进行主成分分析和聚类分析。连续小波和离散小波的前3个主成分的累计贡献率分别为93.12%、89.78%,主成分分析和聚类分析正确率为100%。最终结果显示：傅里叶变换红外光谱技术结合小波变换的方法可以区分鉴别不同种的根茎类作物。

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西北地区芝麻抗旱性鉴定研究   总被引：3，自引：0，他引：3  

刘文萍  任果香  吕伟  文飞 《中国农学通报》2014,30(30):192-198

为探索西北地区在芝麻生殖生长阶段干旱胁迫条件对资源的影响,为我国抗旱品种改良提供亲本,本试验选择山西省农业科学院经济作物研究所为试验点,用中国农业科学院油料作物研究所提供的14 个抗旱资源为试验材料,在芝麻生殖生长阶段进行干旱胁迫处理,调查生育期、出苗率、存活率、株高、叶片数、生物产量、经济产量,进行对比分析。结果显示：干旱胁迫条件下,晋芝1 号、晋芝2 号生殖生长期长,为59 天;幼苗存活率高,为96.6%~100%;株型高大,分别为179.1cm、149.16cm;叶片多,分别为78.3 个、74.8 个;生物产量高,鲜重分别为8.23g、7.61g;干重分别为7.54g、6.82g;经济产量高,晋芝2 号127.50g,晋芝1 号80.0g。表明干旱胁迫不利于芝麻的生长,参试材料中晋芝1 号、晋芝2 号抗旱能力强,可以作为抗旱品种改良的亲本材料和遗传研究的核心材料。  相似文献   

社会转型期县域耕地需求量组合研究     

田秋霞  张仁陟 《浙江农业学报》2014,26(1):0

21世纪处于社会高速转型期,县域耕地需求量的预测是否合理关系到区域和全局的耕地保护压力程度。以夹江县为例,利用粮食安全法、GM (1,1)模型和时间序列预测法对夹江县的耕地需求量进行预测,结合县域的自然、社会经济实际状况及土地利用现状,应用层次分析法对3种预测结果赋予权重,最后用固定权系数预测夹江县的耕地需求量。研究结果表明：2020年耕地需求量14 49359 hm2,2030年为14 28945 hm2,该方法综合了自然、社会经济因素,准确地研究了目标年耕地资源的需求。  相似文献   

浙西南山区单季晚稻‘甬优15号’机插高产群体培育及配套栽培技术   总被引：1，自引：1，他引：0       下载免费PDF全文

蓝月相 《农学学报》2014,4(8):1-3

甬优15号在浙江西南山区种植,表现为丰产性较好,产量高、米质优。实行育秧、插秧机械作业不仅高产稳产,且省工省本。通过多年的育机插秧示范和推广,总结了甬优15号育机插秧优质高产栽培技术。  相似文献   

沾化冬枣降水适应性分析   总被引：1，自引：1，他引：0       下载免费PDF全文

任钟冬孙卫卫  宗晓鸿李业民 《农学学报》2014,4(6):41-44

据统计,包括暴雨洪涝、连阴雨、干旱在内的降水异常灾害是沾化冬枣主产区最严重的气象灾害,因此降水条件成为主产区最易产生不利影响的气象要素。为了解掌握沾化冬枣的降水适应性,对沾化冬枣产业化发展以来降水异常灾害发生情况进行统计,并结合主产区唯一适用的沾化国家一般气象站降水观测资料,系统总结了沾化冬枣适宜降水条件特征,再结合各降水异常灾害受灾时段的降水情况,进一步分析总结对沾化冬枣不利的降水条件,估计部分致灾降水条件。  相似文献   

Development of mediator-type biosensor to wirelessly monitor whole cholesterol concentration in fish     

Mai Takase  Masataka Murata  Kyoko Hibi  Ren Huifeng  Hideaki Endo 《Fish physiology and biochemistry》2014,40(2):385-394

We developed a wireless monitoring system to monitor fish condition by tracking the change in whole cholesterol concentration. The whole cholesterol concentration of fish is a source of steroid hormones or indicator of immunity level, which makes its detection important for tracking physiological condition of fish. Wireless monitoring system comprises of mediator-type biosensor and wireless transmission device. Biosensor is implantable to fish body, and transmission device is so light, in that fish is allowed to swim freely during monitoring. Cholesterol esterase and oxidase were fixated on to the detection site of biosensor and used to detect the whole cholesterol concentration. However, cholesterol oxidase incorporates oxidation–reduction reaction of oxygen for detection, which concentration fluctuates easily due to change in environmental condition. Meanwhile, mediator-type biosensor enables monitoring of whole cholesterol concentration by using mediator to substitute that oxidation–reduction reaction of oxygen. Characteristic of fabricated mediator-type biosensor was tested. The sensor output current of mediator-type biosensor remained stable compared to output current of non-mediator-type biosensor under fluctuating oxygen concentration of 0–8 ppm, which implied that this sensor is less affected by change in dissolved oxygen concentration. That biosensor was then implanted into fish for wireless monitoring. As a result, approximately 48 h of real-time monitoring was successful.  相似文献   

Two HSPs gene from juvenile Amur sturgeon (Acipenser schrenckii): cloning,characterization and expression pattern to crowding and hypoxia stress   总被引：1，自引：0，他引：1  

Meng Ni  Haishen Wen  Jifang Li  Meili Chi  Yuanyuan Ren  Zhifei Song  Houmeng Ding 《Fish physiology and biochemistry》2014,40(6):1801-1816

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Physiological regulation of poplar species to experimental warming differs between species with contrasting elevation ranges     

Jian Ren  Weiran Dai  Chunmeng Yang  Xiangli Ma  Chris B. Zou 《New Forests》2018,49(3):329-340

Climate warming has resulted in rapid range shifts of plant species, but it is not well known how species with different natural distribution ranges adapt to increase in temperature through physiological adjustment. We experimentally imposed a 1.8 °C increase of air temperature to the cuttings of two common poplar species Populus yunnanensis and Populus szechuanica naturally growing in southwest China using open-top chambers. Populus yunnanensis is distributed along a narrower elevation range compared with P. szechuanica. We determined some key physiological parameters and plant growth regulator activities during the growing season without soil water limitation. Our results showed that a 1.8 °C increase in air temperature increased shoot growth of P. szechuanica through an extension of its growth period but did not affect the growth of P. yunnanensis. Malondialdehyde content, guaiacol peroxidase activities and abscisic acid content increased while indoleacetic acid content decreased in P. yunnanensis. Our results suggest that the two common poplar species in southwest China should be able to adapt to the moderate increase in temperature projected for future climate. The growth of P. szechuanica may benefit through phenological adjustment but a further increase in temperature may inhibit the growth of P. yunnanensis. For poplar plantation management, selecting species with a wide natural distribution range could provide an adaptive alternative for buffering anthropogenic induced increase in temperature and help in sustaining productivity for the long term.  相似文献   

Evaluation Method of Solubility of Wheat Straw in LiCl/DMSO Solvent北大核心CSCD     

Yang Y.Ren H.Zhai H. 《林产化学与工业》2018,(4):9-12

In order to solve the quantitative problem of the solubility of lignocellulosic biomass in the solvent system, wheat straw was studied as raw material for a ball milling time on its dissolution behavior in the LiCl/DMSO system. The dissolution performance was evaluated by visual method, optical microscopy and turbidity method respectively. By comparison of visual colorimetry method and the optical microscopy method at the condition of wheat straw dissolved in 8% LiCl/DMSO, it was found that the turbidimetric method is accurate, simple and quantitative. The turbidimetric method can be used to evaluate the dissolution behavior of lignocellulosic biomass during pretreatment and refining. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.  相似文献   

鱼菜共生池塘生态养殖技术——以重庆市九龙坡区为例          下载免费PDF全文

任泓旭 《农业工程》2018,8(1):48-49

鱼菜共生池塘养鱼技术是一种生态养鱼技术,它是依据鱼类和植物的生长环境、营养生理和理化知识等特点,结合水产养殖与蔬菜养殖这两种不同的农业养殖技艺,进行科学的生态规划,实现和谐共生。通过对重庆市九龙坡鱼菜共生项目的研究,说明这种养殖技术存在巨大的经济效益,值得推广。   相似文献