ω-3 多不饱和脂肪酸对母婴健康结局影响的研究进展

综述了国内外研究中ω-3 PUFAs补充与妊娠期间母婴健康结局的关系以及目前推荐摄入的国家的现状和推荐后所带来的健康效益，为我国妇女在妊娠期间是否需要补充剂ω-3 PUFAs以及其推荐摄入量提供科学依据。     

福建冬青属二新种

本文描述了发现于福建的冬青科冬青属2新种——泰宁冬青Ilex tainingensis G. S. He和南平冬青I. nanpingensis G. S. He，并分别说明两者与其他近缘种的区别要点。泰宁冬青与太平山冬青I. sugerokii Maxim.的区别在于前种小枝被毛，无棱槽，叶片宽卵圆形，花淡紫色，分核表面具细条纹，背后中部有一凹槽。南平冬青与拟榕叶冬青I. subficoidea S. Y. Hu区别在于前种果为椭圆形，较大，表面光滑无腺点，果梗长于1 cm，每分核上端有2尖角，均可以区别。     

山西省异爪蝗属二新种（直翅目：网翅蝗科）

本文记述在晋南地区采到的异爪蝗属二新种,黑条异爪蝗Euchorthippus nigiliineatus sp.nov.及曲线异爪蝗Eochorthippus sinucarinatus sp.nov.     

Fractal root system of Melica przewalskyi along different aspect in degraded grassland

Aims Fractal root system is phenotypic plasticity result of plant root architecture to respond to environmental heterogeneity, may reflect the growth strategy of plants to adapt to environmental conditions. Our objective was to explore the relationship between root fractal dimension and fractal abundance of fractal root system of Melica przewalskyi population in response to aspect variation in the northwest of China. Methods The study site was located in a degraded alpine grassland on the northern slope in Qilian Mountains, Gansu Province, China. Survey and sampling were carried out at 40 plots which were set up along four slope aspects transects with 20 m distance between adjacent plots. Handheld GPS was used to determine the elevation, longitude and latitude of each plot. ArcGIS was used to set up digital elevation model (DEM). Community traits were investigated and six individuals roots of M. przewalskyi were collected randomly at each plot. The samples were cleaned and divided into different organs, then scanning the root with the Win-RHIZO for measurements of fractal dimension and fractal abundance in laboratory, and their biomass were then measured after being dried at 80 °C in an oven. Important findings With the slope aspect turned from north to east, west, and south, the density, height and soil moisture content of the plant community displayed a pattern of initial decline, the height, density, root fractal abundance of M. przewalskyi increased and the root fractal dimension decreased. The root fractal dimension was negatively associated with the fractal abundance in all aspects, but the relationship varied along the slope aspects gradient; there was a highly significant negative correlation (p < 0.01) between the root fractal dimension and fractal abundance at north slope and south slope aspect, whereas the correlation only reached a significant level (p < 0.05) at the east slope aspect and west slope aspect; indicating that there is a trade-off between the root fractal dimension and fractal abundance. In addition, when the slope aspect changed from north to east, west and south, the standardized major axis (SMA) slope of the regression equation in the scaling relationships between root fractal dimension and fractal abundance increased (p < 0.05), indicating that the roots of M. przewalskyi at the droughty southern slope have less branch and more sparse in the same soil volume of root exploitation and utilization. Consequently, the resource allocation pattern on reasonable trade-off between root fractal dimension and fractal abundance in different slope aspect of M. przewalskyi, reflects the relationship between the income and the cost of construction of plant root architecture.     

珙桐树上“鸽花飞”

甘肃白水江保护区因有大熊猫、金丝猴、羚牛等国家一级重点保护动物而驰名中外。我作为一名保护区的普通职工,对保护区初期没有国家一级重点保护植物而感到困惑,难道“鱼和熊掌真的不能兼得吗?”带着困惑和试一试的想法,找来孩子的《植物学》教科书,耐心地看了几遍,还做了一个简易的标本夹,每次进林巡山都带上它,遇到不认识的植物便采上两份压在夹子里,下山后总要问问当地老乡,     

澜沧江的沙鳅属鱼类(英文)

通过最近的整理,澜沧江共有沙鳅属鱼类3种,它们是斑鳍沙鳅Botia beaufortiSmith、中华沙鳅B.superciliaris Gnther、黑线沙鳅(新种)B.nigrolineata.黑线沙鳅为新种,鉴别特征是沿背中和体侧有显著的黑色纵条,起自头后止于尾鳍基。首次提出云南沙鳅Botia yunnanensis Chen可能是斑鳍沙鳅的次异名,中华沙鳅是在澜沧江的首次纪录。在附录中记录了突吻沙鳅B.rostrata Gnther,是国内首次纪录,也是萨尔温江和伊洛瓦底江水系的首次纪录。文中每个种均有插图,对新种作了详细的描述,对老种的有关名称作了(林厂里)订或讨论。