丹玉13玉米在辽宁的布局

辽宁省具有历年夏雨集中的规律，而盛夏7～8月降水量在年降水量中占有很大比例。盛夏降水不单对汛期有较大影响，与农业生产引进良种也有很大关系。丹玉13玉米虽然具有很大增产优势，但是该品种对大斑病却没有高抗能力。盛夏降水较大时，对该品种生长发育不利，易发大斑病，不会有较高的产量，进而影响本品种的推广。据分析，当7、8月降水较少，相对湿度也适合时，对推广此品种较为有利。本着这一思路，在本省推广栽培中，考察本品种对气温、日照都较适宜，但对辽宁盛夏降水。     

Analysis on the indicator species and ecological groups of pelagic ostracods in the East China Sea

Ecological adaptation and ecological groups of pelagic ostracods were examined in the East China Sea （23°30′-33°00′N, 118°30′ -128°00′E）, in relation to temperature and salinity. The data were collected in four surveys conducted from 1997 to 2000. The density, yield density, or negative exponent models were used to determine the optimal temperature and salinity of water for the thriving growth of pelagic ostracods. Thereafter, ecological groups and potential distribution patterns of pelagic ostracods were determined based on the predicted parameters such as optimal temperature and salinity, consulting the geographic distribution. The analytical results indicate that, among the numerical dominant pelagic ostracods in the East China Sea （ECS）, Euconchoecia aculeata, E. elongata, E. chierchiae, E. maimai, and Cypridina dentata, etc. are offshore subtropical water species. These species are widely distributed in the area, and they can be brought by the warm current to north offshore during spring and winter. The predicated optimal temperature （OT） and optimal salinity （OS） for Paraconchoecia decipiens, P. echinata, P. spini- fera, P. oblonga, Conchoecia magna and Porroeciaporrecta are all greater than 25℃ and 34 separately. These species are mainly distributed in the waters of the Kuroshio, the Taiwan Warm Current, and the Taiwan Strait, and therefore are designated as ocean- ic tropical water species. On the other hand, Pseudoconchoecia concerttrica is considered as offshore subtropical water species based on its geographical distribution although its OT is 19℃. The other species, though their OSs are approximately 34 and with OTs ranging from 20° to 25℃, are considered as offshore subtropical water species because they were found to be widely distributed from the South China Sea to the East China Sea.     

北京市蔬菜和菜地土壤砷含量及其健康风险分析

通过对北京市蔬菜和菜地土壤砷含量状况进行大规模调查,研究了蔬菜和土壤砷含量及其健康风险,并筛选出抗砷污染能力强的蔬菜品种。根据蔬菜的消费量并兼顾品种多样性的原则,在北京市规模化蔬菜栽培基地 (采集蔬菜及土壤样品) 和蔬菜批发市场 (蔬菜样品) 共采集93种蔬菜400多份蔬菜样品和39个土壤样品系统地分析其砷含量。研究发现：北京市菜地土壤砷含量范围和平均含量分别为4.44~25.3和9.40 mg/kg,明显超过北京市土壤砷背景值;北京市蔬菜砷含量最高达0.479 mg/kg,平均含量为0.028 mg/kg,均未超过《食品中砷限量卫生标准》(GB4810-94) 的限量值,但其中有2个蔬菜样品 (萝卜和大蒜) 砷含量超过WHO/FAO制订的限量标准。北京市蔬菜砷含量在东偏北方向 (偏转11^o-30^o) 存在明显的"U"型趋势分布。裸露地蔬菜砷含量显著高于设施蔬菜。油菜、萝卜、小白菜、大葱、芥菜、黄瓜、大白菜和甘蓝抗砷污染能力较弱,而辣椒、云架豆、冬瓜、茄子、菠菜、西红柿、芹菜等抗砷污染能力则较强。北京市居民从蔬菜中摄入砷平均值为0.016 mg/(人·d),蔬菜砷对北京市部分人群存在一定的健康风险。     

云海奇岩神仙居

神仙居位于浙江省台州市仙居县,古名天姥山,又称韦羌山,拥有目前世界上规模最大的火山流纹岩地貌集群。云雾飘渺、奇峰险崖、绝壁天坑、流泉飞瀑,神奇的山体景观令人叹为观止,李白在《梦游天姥吟留别》里描绘的“霓为衣兮风为马,云之君兮纷纷而来下。虎鼓瑟兮鸾回车,仙之人兮列如麻”等大量的神幻景象尽在其中。神仙居的云海景观以秋冬季节为盛,这里生物品种丰富多样,生态植被良好,群山林海间水气充沛,雨过天晴后,谷底水汽凝成云雾,弥漫山谷,沐浴松林,形成壮美的云海。     

海螵蛸与其近似基原品种的鉴别研究

目的：探讨海螵蛸与其近似基原品种的鉴别特征。方法：参考已有生药鉴别,以及乌贼科权威分类学文献,在对来源准确实物标本观察和记录的基础上,结合体式显微及成像技术,对海螵蛸药典品——金乌贼和无针乌贼,与近似基原品种——白斑乌贼和目乌贼,进行了较为深入的形态鉴别研究,归纳总结了适用于药材和饮片的鉴别特征,并制定了检索表。结果：海螵蛸《药典》品与其近似基原品种在背面的纵肋、腹面的纵槽、横层纹的峰形等形态特征上存在明显差异。结论：通过本次实验研究,补充完善了海螵蛸与其近似基原品种的重要鉴别特征,为海螵蛸的监督检验和标准制订提供了参考。     

佩戴黑色项链四法则

黑色是时尚领域中永恒的色彩。配合今季时装秀场上的黑色热潮,饰品界也笼罩上一片黑色魅影。虽说春日是绿色的天下,不过想要拥有一点不同的春季造型,就在服饰搭配上做点黑色文章。     

小麦品种对禾谷缢管蚜抗性的多目标评价及抗性因素分析

用多目标层次加权法评价了８个小麦品种对禾谷缢管蚜的综合抗性,结果表明,８个小麦品种的抗蚜性强弱依次为Ｗ６（４０）２、小偃六号、ＮＷＡＵ３４－９、陕１６７、陕８００７、８５（６７）２４、８１（２８）２８、８５（６７）１５。抗性因素的分析表明,品种感蚜值与游离氨基酸总量呈负相关,在１７种游离氨基酸中,感蚜值与赖按酸和精氨酸的含量显著负相关,而与总糖含量呈正相关。     

用因子搭配法作寒露风长期预报

本文扼要介绍如何用因子最佳搭配法建立预报方程;并选用4个气象因子,用因子最佳搭配法作寒露风长期趋势预报,效果较好。