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北京城区空气中花粉分析 被引量:47
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作者 何海娟 王良录 张宏誉 《中华临床免疫和变态反应杂志》 2008年第3期179-183,共5页
目的探讨北京城区空气中花粉的种类、含量及逐月分布规律。方法采用重力沉降法的叶氏定点取样器,于1983~1986年及1999~2007年,对北京城区进行每日空气曝片花粉监测。结果1983~1986年空气曝片中花粉的种类分别属于34科35属2种,1999~2... 目的探讨北京城区空气中花粉的种类、含量及逐月分布规律。方法采用重力沉降法的叶氏定点取样器,于1983~1986年及1999~2007年,对北京城区进行每日空气曝片花粉监测。结果1983~1986年空气曝片中花粉的种类分别属于34科35属2种,1999~2007年空气曝片中花粉的种类分别属于35科41属3种;其中云杉属的花粉颗粒最大(150μm×100μm),构属的花粉颗粒最小(13~15μm)。两个阶段20年间花粉含量月分布情况变化很大,1983~1986年峰值以8~9月份为最高,3~4月份为次高;1999~2007年以4月份为最高,8~9月份为次高。结论北京城区空气中常见的、含量高的花粉有10余种。蒿属花粉每年持续时间最长,含量最高;葎草属花粉其次。近10年葎草属花粉有增高的趋势,白蜡树及银杏树花粉大幅度增多。 展开更多
关键词 花粉计数 花粉监测 花粉分类
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A new species of Chilothrips Hood, 1916(Thysanoptera:Thripidae) from China
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作者 胡庆玲 冯纪年 《Entomotaxonomia》 CSCD 2015年第4期249-252,共4页
Chilothrips hangzhouensis sp. nov. is described and illustrated in detail. This new species is similar to C. strobilus but can be distinguished from the latter by the two pairs of ocellar setae and the absent of the p... Chilothrips hangzhouensis sp. nov. is described and illustrated in detail. This new species is similar to C. strobilus but can be distinguished from the latter by the two pairs of ocellar setae and the absent of the pore plates on abdominal sternites Ⅲ –Ⅳ(C. strobilus has three pairs of ocellar setae and abdominal sternites Ⅲ –Ⅳ have pore plates). 展开更多
关键词 Thripinae Chilothrips hangzhouensis taxonomy Pinus pollen
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Research Progress on the Biological Basis of Cereal Pollen Culture
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作者 王学华 罗小仁 戴力 《Agricultural Science & Technology》 CAS 2016年第3期505-510,515,共7页
This paper summarizes the physiological and metabolic mechanism of a series of processes in the cereal microspore culture from the angle of plant physiological metabolism, explores the physiological or cytology mechan... This paper summarizes the physiological and metabolic mechanism of a series of processes in the cereal microspore culture from the angle of plant physiological metabolism, explores the physiological or cytology mechanism of several key processes, including microspore dedifferentiation and callus formation, differentiation and transformation, and sums up the current problems in this field and forecasts the direction of future development. 展开更多
关键词 Cereal crops Pollen culture DEDIFFERENTIATION CALLUS Physiological and biochemical mechanism
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