高粱抗蚜品种叶片化学物质含量的分析

以高粱叶片为试材 ,对高粱叶片的化学物质进行分析 ,结果表明 :高粱叶片中的可溶性总氮、可溶性糖和游离氨基酸 ,特别是必需氨基酸 ,在感蚜品种中的含量显著比抗蚜品种的含量高 ,且感蚜品种叶液偏酸 。

污水排放对红树林植物桐花树叶片分解的影响

利用分解袋法研究城镇生活污水排放对红树植物桐花树叶片实地分解的影响。结果显示 ,在实验开始两周后 ,桐花树叶片在对照样带分解的速度显著快于在污水样带分解的速度。排污样带和对照样带分解袋内叶片的初始非灰分物质干质量 (AFDM)损失一半所需的时间分别是 41d和 32d。然而 ,分解过程中叶片的氮。

辛店发电厂一号机末级叶片裂纹产生原因的分析

辛店发电厂K100-90型 1号机,自投运已累计运行14万小时,总计开停机459次。参与二班制调峰已10年。1993年9月至12月,93天内频繁开停机54次。 12月21日发生末级叶片断裂,经揭缸检查结果如下[1]: (1)25级(末级)55号叶片距叶顶190mm处断裂。

大气二氧化碳浓度变化对禾谷缢管蚜种群动态的影响

利用开顶式熏气室研究了大气CO2 浓度和土壤水分对禾谷缢管蚜Rhopalosiphumpadi (L .)种群动态的影响 ,并分析了禾谷缢管蚜密度与被处理小麦叶片化学成分的关系。结果表明 :(1)禾谷缢管蚜种群密度随CO2 浓度升高而持续增大并与土壤水分密切相关 ,各CO2 浓度下均以 6 0 %田间持水量时的密度最大 ;(2 )CO2 和土壤水分对小麦叶片化学成分有明显的影响 ,麦叶水分、可溶性蛋白质、可溶性糖、淀粉含量随CO2 浓度和土壤水分含量上升而增加 ,纤维素含量随CO2 浓度上升而增加、随土壤水分含量上升而降低 ,单宁、丁布 (DIMBOA)含量在CO2 浓度为 5 5 0 μl L时最高 ,但单宁含量随土壤水分上升而增加 ,丁布含量在 6 0 %田间持水量时最低 ;(3)禾谷缢管蚜密度与叶片水分、可溶性蛋白质、可溶性糖、淀粉含量呈正相关 ,与丁布、单宁含量呈负相关。结论 :在未来的气候条件下 ,随着CO2 浓度升高禾谷缢管蚜种群可能会持续增长 ,这种增长在半干旱区更加突出。禾谷缢管蚜种群增长的原因之一是大气CO2 和土壤水分条件改变了植物的化学成分构成。

Effect of Controlled Atmosphere Storage(CAS)Technology of Flue-cured Tobacco Laminas on the Alcoholization Quality of Tobacco

To achieve the continuous maintainence of optimum quality state of flue- cured tobacco laminas and the effective regulation and control on alcoholization time for controlled atmosphere storage （CAS） method in the process of storage, the lam- ina samples of natural alcoholization for 1 year were selected. Comparable analysis on the appearance quality, chemical components and sensory quality of flue-cured tobacco laminas in the process of alcoholization was carried out by using the meth- ods of CAS and natural alcoholization. The results showed that appearance and color through the treatment of natural alcoholization were deep, browning and ac- companied by the phenomenon of oil, while color scale of flue-cured tobacco lami- nas through the treatment of CAS was uniform, fullness was better, and these two methods were close or identical after opening for 3 months. The contents of total sugar and reducing sugar during the process of alcoholization were also gradually decreased, but the ratio of reducing sugar to total sugar of laminas via CAS was higher than that of the natural alcoholization treatment. Compared with the natural alcoholization,the descending trends of total nitrogen and nicotine contents during CAS were gentler, the ratio via CAS was closer to 1, and the coordination of chemical components was more superior. During the period of alcoholization for 6 to 12 months, sensory quality of laminas via the natural alcoholization treatment was more superior than that of CAS treatment. However, after 18 months of alcoholiza- tion, sensory quality of laminas via the CAS treatment was more superior than that of the natural alcoholization treatment, and the CAS treatment could improve opti- mum sensory quality by 0.5 to 1.5 scores. Additionally, the CAS treatment could prolong the time of optimum alcoholization quality for 6 months, compared with the treatment of natural alcoholization. The CAS method could influence the alcohoJiza- tion quality of flue-cured tobacco laminas and prolong the retention period of opti- mum quality status for flue-cured tobacco laminas by regulating the environmental aas composition, thereby realizin.q quality control of flue-cured tobacco laminas.