A report on the conservation status of segetal weeds in Tajikistan

Intensification of agriculture has significantly diminished the populations of segetal weeds worldwide in recent decades. Remarkable changes to the entire flora and vegetation of man‐made habitats are being observed in agroecosystems. The present study analyses, for the first time, the threat status of segetal weeds in Tajikistan. A group of 871 weed species were evaluated against IUCN criteria. The assessment of threat status revealed that 214 weed taxa have to be regarded as threatened in Tajikistan, including 18 endemic and four subendemic plants. Five species have been classified as extinct, 27 as critically endangered, 27 as endangered, 39 as vulnerable, 34 as near threatened and 44 as in the ‘least concern’ category. For 38 species, the threat level was not possible, due to lack of data. The most threatened group of taxa is related to rice paddy fields. Numerous losses and disappearances were also observed in cereal communities. Percentages of threatened species in different chorological groups amounted to 58% in the Irano–Turanian, 17% in the Pluriregional, 11% in the Mediterranean, 9.5% in the Cosmopolitan and 4% in the Euro–Siberian species group. Assessment of the threatened status of the rich segetal flora of Tajikistan affords the opportunity to raise awareness of the value of this group of species in the country and may be useful in the conservation management of arable habitats. The results show that even though agriculture in Tajikistan is still based on traditional management and manual work, weed control causes a serious threat to its segetal flora.     

论工程量清单计价对建筑市场的影响

工程量清单计价制度对构成建筑市场的各组成要素产生重大影响,对施工企业,招标机构,造价管理等部门影响进行逐一分析。     

河北省武安国家森林公园地衣调查初报

对采自武安国家森林公园地衣种类进行了鉴定与分类,初步确定地衣15属21种,其中河北省地衣新记录种1种：裂果双缘衣Diploschistes actinostomus（Pers.）Zahlbr.,并对21种地衣的基物、地理分布特点以及新记录种的形态特征作了初步的讨论。     

古代天津乡人著述举要

界定了天津乡人的概念,对天津乡人著述情况按照时间顺序及类别进行了归纳和介绍,便于读者检索和查阅。其中一些天津乡人著述是对《天津县新志.艺文》的补充,对整理天津旧籍、充实完善《天津文钞》和《津门诗钞》大有裨益。     

非负特征图的列表不完全染色的研究

每一个顶点u∈V(G),若任意给定k种颜色的列表,G都存在一个L-染色,使得G的每个顶点至多有d个邻接点与其染相同的颜色,则称图G为(k,彩*-可选的.文章证明了每个可以嵌入到非负特征曲面的图,若不包含4-圈和7-圈,G是(3,1)*-可选的.     

辽东湾网采浮游植物名录

为规范辽东湾浮游植物中文名、拉丁名写法,本文根据辽东湾历年监测资料整理了浮游植物名录,并与最新的数据库及专业浮游植物图谱、专著进行了校对,供研究参考。     

鄂通两头乌与通城猪肌肉中重要营养风味物质的比较

为比较鄂通两头乌与通城猪肌肉营养和风味物质的差异,分别对两群体背最长肌中氨基酸、脂肪酸、肌苷酸和硫胺素4类营养风味物质进行测定和分析。结果显示:通城猪肌肉氨基酸种类齐全,16种氨基酸总量为(19.42±1.31) g/100 g,必需氨基酸含量为(8.47±0.98) g/100 g,主要鲜味氨基酸含量为(6.80±0.46) g/100 g;脂肪酸种类丰富、营养风味价值高,饱和脂肪酸含量为43.04%±1.84%,不饱和脂肪酸含量为56.96%±1.84%,其中单不饱和脂肪酸含量为47.47%±2.63%,多不饱和脂肪酸含量为9.50%±2.50%,亚油酸含量达8.93%±2.36%。而其风味物质硫胺素和肌苷酸的值分别为(0.23±0.05) mg/100 g、(3.23±0.67) mg/g。鄂通两头乌肌肉中多不饱和脂肪酸(12.08%±4.72%)、亚油酸(11.36%±4.44%)和硫胺素((0.23±0.05) mg/100 g)显著或极显著高于通城猪,上述其他性状与通城猪差异不显著(P0.05)。以上结果表明:鄂通两头乌和通城猪的猪肉均具有高营养价值和独特风味等特点,而且鄂通两头乌除保留了通城猪肉的营养风味外,多不饱和脂肪酸、硫胺素含量更高,值得进一步开发利用。     

广西绿化植物黄素梅病虫害调查初报

为了解绿化植物黄素梅栽培中的病虫害危害情况,2006~2007年在广西的几个主要城市对黄素梅病虫害进行了系统调查,发现危害黄素梅的病虫害共有9种,分别是日本龟蜡蚧、棉蚜虫、温室白粉虱、黄蓟马、黄尾毒蛾、灰巴蜗牛、煤污病、中国菟丝子和1种叶斑病等。黄素梅病虫害总体发生数量少、危害程度轻,是一种优良的绿化树种,可进一步扩大种植。     

藠头与日本肯定列表略论

通过调查分析,结合实地考查,对藠头产业应对日本"肯定列表制度"进行了系统的分析和总结,并提出了相关建议。     

我国生物农药登记品种清单式管理初探

近年来我国生物农药新品种层出不穷,登记热度持续上升,登记管理不断规范。本文探讨了对我国生物农药登记品种采取清单式管理,提出生物农药登记品种清单的范围和建立原则,梳理形成了我国生物农药登记品种清单,提出了完善生物农药登记品种清单式管理的意见建议。