查询词典 shrub steppe

Effect of Arbuscular mycorrhiza on steppe plants and infection rate of steppe plants varied with species of the mycorrhiza and plants. The effect on Agrostis hugoniana was greater than on Festuca rubra in all inoculation treatments, and the effect of the combinations of Festuca rubra+Glomus mosseae and Agrostis hugoniana+Glomus intraradices were more significant than others.

4同一、不同AM真菌对不同或同一草地植物的侵染及所产生的菌根效应具有不同程度的差异，穗序剪股颖各接种处理普遍优于紫羊毛，紫羊毛＋Glomus mosseae穗序剪股颖＋Glomus intyraradices优于同组其他接种处理的趋势较为明显。

The fossil pollen date showed that vetetation changed from desert steppe dominated by Artemisia in early Holocene, though desert dominated by Chenopodiaceae at 9.0-6.3 ka, desert steppe dominated by Artemisia at 6.3-2.5 ka, to desert dominated by Compositae at 2.5-1.0 ka and Chenopodiaceae after 1.0 ka.

青土湖剖面孢粉分析结果显示，该区9.0ka之前为蒿属为主的荒漠草原，9.0～6.3ka藜科为主的荒漠，6.3～2.5ka蒿属为主的荒漠草原，2.5～1.0ka菊科为主的荒漠，1.0ka之后为以藜科为主的荒漠。

Leymus chinensis steppe is one of the unique types of rhizomatous steppe that appeares in middle-Asia. In recent years, plant functional groups have been became a new research focus.

羊草草原是亚洲中部草原特有的一类根茎禾草草原，对其在放牧条件下的草地的研究有助于认识典型草原的整体状况，具有普遍意义。

Based on these, this study was to determine the relationship between standing vegetation and soil seed bank. The main results are as follows: 1 Effects of grazing on plant communities The grazing successions were Stipa klemenzii → Salsola collina + Stipa klemenzii → Salsola collina community in the desert steppe; Stipa grandis or Leymus chinensis → Cleistogenes squarrosa + Stipa krylovii or Stipa grandis → Potentilla acaulis + Cleistogenes squarrosa community in the typical steppes and Leymus chinensis + forbs →Leymus chinensis + Stipa baicalensis community in the meadow steppe.

主要结论如下： 1放牧对植物群落的影响荒漠草原的放牧演替规律为小针茅群落→猪毛菜+小针茅群落→猪毛菜群落；典型草原为羊草或大针茅群落→糙隐子草+大针茅群落或克氏针茅群落→星毛委陵菜+糙隐子草群落；草甸草原为羊草杂类草群落→羊草+贝加尔针茅群落，这是不同物种对牧压的不同适应结果造成的。

The plants on desert steppe exhibited the strongest xeromorphic characteristics, and 3 species of Stipa on the desert steppe had abundant genetic polymorphism.

荒漠草原区的植物是旱生程度最强的一类草原群落，该区的3种针茅具有丰富的遗传多态性。

The results show that the construction of the railway has an obvious effect on the warm steppe,but the characteristics of community,such as the coverage,ecological dominance and species richness of communities have been improved after its natural restoration,and some species,such as Elymus nutans,Aconitum gymnandrum and Thermopsis lanceolata,play an important role in the restoration communities.An assistant measure taken by human beings will benefit to the restoration.There is no any evidence of exotic invading plants in the restoration of the warm steppe in the study area.

结果显示，青藏铁路修筑过程对铁路两侧一定区域的温性草原有较大影响，但随着受影响区域植被的自然恢复，群落盖度、生态优势度和物种多样性等反应群落特征的指标都有一定程度的改善，一些在原生植被中很少出现或伴生种在恢复后的群落中有可能成为群落的优势种或建群种，如露蕊乌头和鹅绒委陵菜等；人为辅助措施将有利于受损植被的恢复；修筑铁路过程中受到影响的温性草原其恢复过程中尚未出现外来入侵植物。

And than the soil water contents of mountainous meadow was intervenient. The diversification of soil bulk density was completely reverse with the soil water contents. The soil bulk density of alpine meadow and sub alpine meadow was evidently lower than hilly meadow steppe and alluvial flat meadow steppe.

高山和亚高山草地类型的土壤含水量明显高于低山丘陵和河滩阶地的类型，而中山类型的草地土壤含水量在它们中间；土壤容重的变化趋势则完全相反，高山和亚高山草地类型的土壤容重明显低于低山丘陵和河滩阶地的类型。

The soil water contents of alpine meadow and sub alpine meadow was evidently higher than hilly meadow steppe and alluvial flat meadow steppe.

随着海拔高度的上升，共有种逐渐减少，β多样性增加，物种替代速度逐渐增大。

The following conclusions have been made in this paper.(1) Based on CO_2 flux data of eddy covariance, variation characteristics of gross primary productivity in four flux observation stations were studied, which are an alpine meadow, an alpine shrub meadow, a swamp alpine meadow and a steppe alpine meadow at Dongxiong. The results show that photosynthetic capacity of the alpine meadow is the highest, and the annual total GPP is 652.2g C/m~2. Daily-differencing approach is used to analyze the random error of CO_2 fluxes measurements. The results show that the distribution of random error follows more closely follows a double-exponential, rather than a normal distribution, capturing the high peak and thick tail, and the random error varies with environment variables, which violates the assumptions for the ordinary least squares fitting with normality and homoscedasticity, consequently, we introduce maximum likelihood method for parameter optimization.

本文主要在以下几个方面开展工作并获得了一些认知和结论：(1)通过分析样带区域内高寒草甸、高寒灌丛、沼泽化湿地和草原化高寒草甸四个通量观测站点草地生态系统总初级生产力变化特征，研究结果表明HBBT矮嵩草草甸生态系统植被光合作用能力较强，年GPP总量为652.2 gC/m~2，明显高于其他三种生态系统；通过利用"单塔日变化法"获得四站点通量观测数据随机误差，结果表明通量观测随机误差概率分布呈现尖峰厚尾的特征，与正态分布相比，更服从双边指数分布，进一步分析表明通量观测随机误差随环境变量(风速、温度和光合有效辐射)的变化而变化，这违背了普通最小二乘法进行生态过程模型参数优化正态分布且误差同质的假设，因此本研究中引入最大似然法进行生态过程模型参数优化。

Wang. They are half-shrub belonging to section Dracunculus of genus Artemisia. with close kinships and quite similar morphological characteristics. Distributed in sand of steppe region and desert region in northern China, they are edificators or dominant species of sand vegetation and important wind break and sand fixation plants.

Wang是同属于蒿属龙蒿组的半灌木蒿类，亲缘相近，形态特征十分相似，分布于中国北方的草原区沙地和荒漠区，并成为沙生植被的建群种或优势种，是我国防风固沙的重要植物。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。