羊草

Leymus chinensis ; different geographic populations ; factor of water ; adaptedness ; genetics and differentiation

羊草；不同地理种群；水因子；适应；遗传分化

It is proposed the gene is designated as Pm34. A dominant major powdery mildew resistance gene in a BC〓F〓 population, derived from a cross between an amphidiploid of T. durum acc. DR147-Ae. caudate acc. Ae14 and wheat cv. Laizhou953, was identified.

在由硬粒小麦DR147-尾状山羊草Ae14合成的双二倍体与普通小麦品种莱州953杂交衍生的BC〓F〓群体中鉴定了一个显性抗小麦白粉病基因。

Triticum ; Aegilops ; amphidiploid ; seed—set

小麦；山羊草；双二倍体；结实率

Wheat germplasm lines were obtained from the posterity of Aegilops tauschii-Triticum Carthlicum amphiploid, and analysis results showed that the 30 germplasm lines have many excellent characters, such as multi-tillers, multi-spikes per plant, good disease resistance, large ear, etc., they are very useful in genetic improvemert of wheat.

从粗山羊草与硬粒小麦合成的双二倍体后代中选育出30个种质系，对其鉴定结果表明，它们的分蘖力、单株穗数、抗病性、穗长等性状表现优异，具有重要利用价值。

Betaine was also detected in Chinese leymus.

在羊草中也已测出有甜菜碱的积累。

Results on the effects of grazing by sheep on species and functional group diversities had not led to consensus in different communities: species richness, species diversity, diversities of life forms and water ecological type groups decreased with grazing intensity increased except in the Leymus chinensis + forbs community.

放牧对4种群落物种和功能群多样性的影响随不同的群落而表现不同：物种丰富度、物种多样性、生活型多样性和水分生态类型多样性除羊草杂类草群落外随放牧强度的加大而降低，但适度放牧增加了羊草杂类草群落的上述多样性指标。

Four typical grassland communities, Stipa klemenzii, Stipa grandis, Leymus chinensis and Leymus chinensis + forbs, had been chosen along precipitation gradients from 200, 290, 350 to 450 mm respectively in Inner Mongolia Steppe. The objectives of this study were to determine the effects of grazing on plant community composition, aboveground and belowground biomass, species and functional group diversities and the relationship between diversity and productivity, the effects of grazing on soil seed bank species composition, seed density and diversity along the transect.

选取内蒙古草原三种主要草原类型(草甸草原、典型草原和荒漠草原)代表性群落羊草杂类草群落、羊草群落和大针茅群落、小针茅群落，应用样线法沿水分梯度研究放牧对内蒙古草原不同植物群落功能群组成、多样性、生产力以及多样性与生产力关系的影响和放牧对土壤种子库组成、大小以及多样性的影响，在此基础上，研究土壤种子库与地上植被间的关系。

Moreover,the reservation of carbohydrate and nitrogen in under-ground organs can provide energy basis for herbivory tolerance.

而且，羊草贮存的碳水化合物与氮素储备为羊草耐牧性提供物质和能量基础。

The results indicate that (1) with the increase of grazing intensities from light, middle, heavy to overgrazing, plant coverage and aboveground/belowground biomass decreases, the structure of plant community changes from simple to complexity and to simple, the type of plant community changes from mesophytes+xerophytes to xerophytes and to halophytes.

结果表明，随著放牧强度的增加，羊草草原的植被盖度和生物量随之降低，优势羊草群落将逐渐被盐生植物所替代，群落结构趋於简化，物种向旱生化和盐生化演替。

The results showed that the daily change pattern of net photosynthetic rate of Aneurolepidium chinense could be expressed as a two-humped curve, the daily change pattern of transpiration rate is one-humped curve.

对松嫩平原盐碱化草地羊草叶片的光合生理生态特征分析表明，晴朗天气条件下，羊草叶片净光合速率日变化呈双峰型，蒸腾速率属单峰型。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。