查询词典 grassland

The results show that, firstly, Stellera chamaejasme L, which rely on their developed axial root system in the 10～40cm soil layer to occupy the competitive priority of volume, length, surface area and so on, in the case of their adaptive faculty to poor surroundings resulting from fruit picking, trampling and overgrazing as well as with the phenomenon of restrained growth among various plants, gradually become the dominant plant in the herbaceous community; secondly, this kind of degraded grassland has not displayed any general characteristic of degradation such as surface exposure, accumulative quantity of vegetation reduced, water loss, soil erosion and so on, therefor, it should be dealt with distinguishingly; thirdly, if"Stellera chamaejasme L Killer"and"Oxytropis ochrocephala Killer"invented by CAS are taken advantage of respectively in the bloom period of Stellera chamaejasme L and at the beginning of florescence of Oxytropis ochrocephala bunge by ultra-low volume spray of 1. 05L/hm〓 and 1. 35～165L/hm〓 dosage separately, the death rates of poisonous herbs may achieve above 95% and 92% correspondently; fourthly, this technology with the characteristics of high work efficiency, exclusive selectivity and convenient operation, is safe to non-target plants and other animals, and has no toxic or side-effect to environment; furthermore, an execution of"Stellera chamaejasme L Killer"spray and a two-year grazing prohibition can be effectively applied on degraded grasslands of"Weed and Poisonous plants Type".

结果表明：狼毒凭借发达的轴根系在10～40cm土层中形成的体积、长度、表面积等竞争优势，以及对采食、践踏、过度放牧所形成的不良环境的适应能力和异株克生现象的存在，逐步成为草群中的优势植物；毒杂草型退化草地没有表现出地表裸露、植物蓄积量减少、水土流失等一般性退化特征，对该类草地的治理应区别对待；应用中科院研制的'灭狼毒'和'灭棘豆'分别在狼毒盛花期和黄花棘豆初花期，以1.05L/hm〓、1.35～165L/hm〓的施用量超低容量喷雾，毒草的死亡率可达到95％、92％以上；该技术具有工效高、选择性专一、灭效高、操作简便，对非靶标植物和其它动物安全，对环境无毒副作用的特点；采用喷施'灭狼毒'+短期禁牧措施，可以有效治理毒杂草型退化草地。

Sometimes, I sat on the grassland, gazing into the sky and dreaming of you, stepping downby a seat in the imperial carriage, helping me stand up from dust and arranging me by your seat.

有时我坐在草地上凝望天空，梦想着你从车辇的座位上走下来，把我从尘埃中扶起，并安置在你的座位旁。

Dzeren have the thin and beautiful outlines and often live in the grassland of Semi-desert areas.

黄羊的体形纤瘦，身姿优美，栖息于半沙漠地区的草原地带。

We analyzed the relations of plant ecological type groups and community biomass and environment changes in the grassland communities of Leymus chinensis as edificator along Northeast China Transect.

初步分析了中国东北样带以羊草为建群种或共建种的草原群落植物水分生态类型功能群生物量及其与群落初级生产力和环境变化的关系。

The results showed:①the communities that stipa baicalensis is edificator had the highest species diversity, and the idea that stipa baicalensis communities were the local zone vegetation was supported;②the majority of studied communities were unsaturated in the species diversity, and the species diversity had a tendency to increate with the improvement of soil environment;③the relation of species diversity to community productivity was a one-humped function, that is, the species diversity of mediation productivity was highest;④the species diversity under intermediate disturbance was highest, and the intermediate disturbance hypothesis was supported;⑤the content of potassium in soil had probably an important function, or was an important following factor in the types of grassland community;⑥a new hypothesis on the forming mechanism of species diversity of community, Small Scale Competition and Random-Patch Dynamic Hypothesis, was put forward boldly.

通过上述研究分析得出如下结果：①以贝加尔针茅为建群种的群落物种多样性最高，从物种多样性角度证明该群落类型最适应本区气候和环境条件，应是本区的地带性群落；②绝大多数群落的物种多样性处于未饱和状态，随土壤环境的改善呈明显的增加趋势；③物种多样性与群落生产力呈单峰函数关系，即在中等生产力水平时物种多样性最高；④放牧中等干扰水平物种多样性最高，支持Connell的中度干扰学说；⑤偶然发现土壤钾含量可能在草地植被类型分化中起到重要作用，至少是一个重要的伴随因子；⑥大胆提出了群落物种多样性构成机制的新学说即小尺度竞争随机斑块动态学说。

In the natural improved grassland with uncultured and resowed,the sorts of grass increased 5～8 varieties,and the height of elymus dahuricus and the sedge respectively was higher than that of the control area for...

在免耕补播改良天然草地方面，草地植被种类增加5～8种，披碱草高度较对照区高出18cm，苔草高出4cm，其总盖度较对照区高出近20%，而施肥试验草层高度较对照区增加了1.5cm，其盖度由55%增加至90%，增幅为35%。

The fruiting bodies of ectomycorrhizal fungi were abundant and diverse in intact forest dominated by Fagaceae. Only a few species of macrofungal bodies were found in the pine dominated forest and secondary broad-leaved forest and none were seen in grassland during the study.

外生菌根菌子实体在以壳斗科植物为优势种的原生性次生林中较多且种类丰富，在松林和次生阔叶林有少数种类，但次生草坡群落未见有外生菌根菌子实体。

Therefore, M. falcata is more appropriate than M. sativa to grow on the Songnen grassland.

因此，认为黄花苜蓿比紫花苜蓿更适合在松嫩草地上种植。

The results show that:(1) Fire is inevitable in the grassland and fernland in Hong Kong.

目前遭火烧是不可避免的，但其发生有一定的周期性。

Fire and its ecological role in the grassland and fernland are studied.

本文研究火对香港草地和芒萁群落的影响。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。