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禾本科

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Due to the causes such as polyploidy and self-incompatibility,the plants ofPaspalum,with the greatest number of apomictic species,show much complex and various reproduction characteristics.

由于多倍体的存在及有性生殖的自交不亲和等原因,雀稗属植物表现出复杂多样的生殖特性,是禾本科中具备无融合生殖特性种类最多的属。

On the basis of pollen analysis of surface sample in North China, polynomial function analysis method was applied to establish pollen climate response surface of Pinus, Betula, Quercus, Artemisia, Chenopodiaceae, Compositae, Picea, Ephedra, Gramineae in North China, therefore an easy and applicable method for reconstructing palaeoclimate and palaeoenvironment with data of fossil pollen was founded; Multi-analysis method was applied to analyse the principal elements of surface sample pollen in central Inner Mongolia Steppe, the assemblages of surface sample pollen in steppe area and its relationship with vegetation type were discussed with helps from spore-pollen analysis of a peat section in Chasuqi, Inner Mongolia and 〓C chronometer, fossil pollen data were obtained with high resolution on the peat section in Chasuqi. Vegetation succession and environmental changes since Holocene at resolution of 70 years were primarily reconstructed in south Mount Daqingshan and Plain Tumete. The changes in the area were copmared with those in the neighbouring areas during the same period. It was found that Holocene environmental change had undergone the following stages: cold-arid, temperate-wet, warm-wet, temperate-arid and cold-arid, and the climatical optimum period occurred in 5000-4100 aB.

本文在对中国北方表土花粉研究的基础上,采用多项式函数回归方法建造了中国北方松属、桦属、栎属、蒿属、藜科、菊科、云杉属、麻黄属、禾本科等的花粉——气候趋势面,从而为利用化石花粉资料直接恢复古气候、古环境提供了一种方便易行的方法;采用多元分析方法对内蒙古中部草原区表土花粉进行了主成分分析,探讨了草原区表土花粉组合的规律及与植被类型的关系;本文还应用孢粉分析方法,结合〓C测年技术,通过内蒙古中部察素齐泥炭剖面高分辨率的化石花粉数据,初步恢复了大青山山地南部及土默特平原地区分辨率为70年的全新世以来植被演替和环境变迁的状况,并与邻近地区的全新世古气候、古环境进行了对比研究,研究发现,本区域全新世古环境的变迁序列基本上可以与周围地区及华北地区进行对比,其环境变迁经历了凉干~温湿~暖湿~温干~凉干的变化,且气候最适宜期出现在5000~4100aB.P。

Bor is a rhizomatous grass with characteristic sand fixation.

Bor是禾本科的一种沙生旱生植物,靠根茎进行无性生殖。

Perhaps the most interesting part of the grass emtryo is a shield-like structure called the scutellum.

禾本科胚最有趣的部分似乎是所谓盾片的盾状结构。

The species of grasses were scarce in the contents and only two species of sedge s occurred in the contents, the most vegetation were forbs in the content.

禾本科 植物在高原鼢鼠的胃内容物中基本没有发现,对莎草科植物也只取食两个物种,高原鼢鼠所取食的植物主要是杂类草。

The mixture grass and legume cultivars proportion sows the optimum seedsman in accordance with the entirety comparison and each group has only increased the variety quantity.

混播比例豆科栽培品种和禾本科栽培品种按最佳播种量,对照组和各个处理的播种量完全一致,在各个处理只增加品种。

A stalky plant with brittle, crumbly, flat leaves. Clover oralfalfa flowers may be seen as well.

豆科植物有不同的根和叶结构和比禾本科草类含有更多的钙和蛋白质。

Rice is one of staple grain crops, now it is a kind of modern plant in molecular biology.

水稻是主要的粮食作物之一,也是禾本科作物分子生物学研究的模式植物。

As to the growth type, there are 2 species of trees, 2 species of shrubs, 54 species of herbs.

其中禾本科16种、菊科8种;草本54种,灌木2种,乔木2种。

It is an important measure of intercropping and mixture modes of oat and common vetch to increase forage yield and quality.

豆科牧草与禾本科牧草混播是提高饲草产量和品质的重要措施。

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However, as the name(read-only memory)implies, CD disks cannot be written onorchanged in any way.

然而,正如其名字所指出的那样,CD盘不能写,也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口,替代木托盘,免薰蒸,符合欧盟、北美各国对出口货物包装材料的法令要求;喷涂钢托盘适用于重载上货架之用,托盘表面根据需要制作成平板状、波纹状及间隔形式,满足不同的使用要求。

A single payment file can be uploaded from an ERP system to effect all pan-China RMB payments and overseas payments in all currencies.

付款指令文件可从您的 ERP 系统上传到我们的电子银行系统来只是国内及对海外各种币种付款。