查询词典 migratory dune

We have observed the structure of these dune sands and analyzed the grain-size,surface textural features and several main chemical elements of them,the results showed that:(1) these dune sands have some eolian structure characteristics which are similar to the recent dune sands;(2) they are also similar to the recent dune sands in grain-size components,and parameters of Mz,?滓,Sk and Kg,as well as in several main chemical components;(3) the scatter plots of Mz-?滓,SiO2-Al2O3+TOFE and the probability curves of grain-size showed that these paleo dune sands are different from paleosols and fluvio-lacustrine facies but are consistency with recent dune sands;and(4) the quartz sands have well roundness and some surface textural features such as dish-shape pits,crescent-shape pits,pockmarked pits,upturned cleavage plates,siliceous precipitates and siliceous crevasses,indicating that they had been carried for a long time by the wind.

对这些沙丘砂的沉积构造观察以及粒度、扫描电镜和常量化学元素分析结果表明：(1)这些沙丘砂具有与现代沙丘砂相似的风成沉积构造特征；(2)粒度及其参数--Mz、σ、Sk和Kg，以及主要化学组分SiO2、Al2O3和TOFE也与现代沙丘砂相近；(3)Mz-σ、SiO2-Al2O3+TOFE散点图和概率累积曲线显示这些沙丘砂与萨拉乌苏组中的河湖相、古土壤差别明显，而与现代沙丘砂一致；(4)石英砂颗粒具有良好的磨圆以及碟形坑、新月形坑、麻坑、上翻解理薄片、硅质沉淀和硅质裂纹等表面结构特征，反映其曾受持久的风力搬运作用。

This study provided the analysis of changes of species diversity and productivity in relation to soil properties in six typical habitats （wet meadow, dry grassland, fixed dune, semi-fixed dune, semi-shifted dune, and shifted dune） in Horqin Sand Land.

研究了科尔沁沙地6个典型生境类型的沙质草地群落物种多样性与生产力的变化，分析了植物群落格局、物种多样性、生产力与土壤特性的关系。

Migratory birds in the summer of 28 kinds of migratory birds, leaving gulls, hunting hawk, white-tailed Harrier state protection for birds; three kinds of migratory birds in winter, white-tailed sea eagle, sea eagle for the protection of Yudai focus; Brigade 13 kinds of birds, the swans, cranes, steppe eagles, gray Falcon focus for the protection of the back; remaining 17 kinds of birds, kite, eagle Wu Hu, Wu eagle, vulture, kestrel, for the protection of focus.

候鸟中夏候鸟28种，遗鸥、猎隼、白尾鹞为国家重点保护鸟类；冬候鸟3种，白尾海雕、玉带海雕为保护重点；旅鸟13种，大天鹅、鹤、草原雕、灰背隼为保护重点；留鸟17种，鸢、胡兀鹫、兀鹫、秃鹫、红隼、为保护重点。

There is evidence indicating the existence of an innate migratory drive as well as genetic control of the onset, duration and end of the migration period, the amount of migratory activity, a genetically prescribed parameter that determines the distance over which the bird flies, the migration directions and physiological parameters, in particular fat deposition during the migratory period, but also those determining which individuals will migrate and which will not in forms that are obligatorily partial migrants.

有证据表明，存在某种先天的迁徙动因并涉及以下几方面的遗传调控：(1)迁徙过程的起始、持续以及结束；(2 )迁徙活动量，即决定鸟类飞行距离的遗传参数；(3)迁徙方向；(4)生理参数，特别是迁徙期间的脂肪贮存，以及对于那些部分个体迁徙的鸟种而言，决定个体迁徙与否的生理参数。

The field experiments on the near surface airflow, sand transport rate, grain size of the dune sands and the morphology of the dunes show that though shear velocity decreased at the toe of the transverse dune, the threshold shear velocity decreased simultaneously. The decreased threshold shear velocity and unsaturated sand flows at the stoss slope of the dunes resulted the erosion at the toe of the dune.

对简单横向沙丘表面的气流、输沙率、物质结构，以及形态学特征的观测表明，在横向沙丘迎风坡坡脚尽管剪切速度有所下降，但起动剪切速度同时减小，起动剪切速度减小与不饱和风沙流是沙物质在迎风坡坡脚不能产生沉积的主要原因。

Surface-consistent deconvolution using variable prediction step, and suppression of sand dune ringing;2. Spatiotemporal distribution of moisture content in sand dune s of the unirrigated forestation along the southern marginal zone of Gurbantunggut Desert;3. The concepts of sand land, sand dune and desertified land etc.

在实地调查和多年定位研究的基础上，根据目前沙漠化过程研究的需要，介绍了沙地、沙丘、沙漠化土地等相关概念及其主要区别，阐述了沙地、沙丘、沙漠化土地类型的划分标准以及类型互换使用中应该注意的问题；通过分析影响沙漠化发展方向和过程的关键因素，建立了沙漠化正、逆发展过程的地面判别指标体系，并讨论了不同类型沙丘的主要来源、发展方向及转换过程的判别方法。

The width effects of dune are studied and the reason that the barchan dune is formed on the lee slope of dune is given.

但对于背风坡形状的形成，特别是对新月形沙丘，这样一种沙漠、戈壁上最常见的相对稳定的横向沙丘的背风坡新月形落沙坡的形成和保持，无有完整的理论分析，只是简单地认为其坡度不能大于沙子的摩擦角而已。

The results show that the proportion of the soil evaporation to the precipitation is greater than 60% in wandering dune and semi-fixed dune, and it is 44.8% in fixed dune.

研究指出，自然条件下该区土壤蒸发占降水的比例在流动沙地和半固定沙地大于60%，在固定沙地为44.8%。

To make sure of the characteristics of Landform in Aer sand-fixation area, a related investigation was conducted , the results shows that Aer sand-fixation area can be divided into five kinds of landforms , namely wandering dune , semi-wandering dune , fixed dune , wind-erosion flatting area and Low-Lying interspaces between mountains .

调查结果表明，彰武县阿尔乡围封沙地按地貌特征可分为五种地貌类型：即流动沙丘、半流动沙丘、固定沙丘、风蚀洼平地和丘间低地。

From March to May, 2008, we surveyed avian community structures in 3 typical urban forest of Shenyang city (Campus of Liaoning University, Shenyang Arboretum, Chinese Academy of Sciences, and Beiling Park). During the study, total 25 species of birds were recorded, which included 12 resident species, 6 aestival migratory species, 3 hiemal migratory species, 5 breeding species, and 3 passenger species.

2008年3月至2008年5月，对沈阳市三处城市森林（辽大校园、中国科学院沈阳树木园、北陵公园）中鸟类的群落结构进行了调查，全部林地中共记录到25种鸟类，其中有留鸟12种，夏候鸟6种，冬候鸟3种，繁殖鸟5种，旅鸟3种。

The two-acre Dunbar Community Garden in Little Rock has served as a model for several years.

几年来，坐落于小石城，占地两英亩的邓巴社区菜园树立了一个标杆。

Jerry points to the jacket hanging in the bathroom. It's ruined, and unwearable What?

杰瑞指着洗手间里挂着的夹克，毁了，不能穿了）什么？