查询词典 vegetation

It is pointed out bythe monthly dynamic analysis and yearly comparative analysis that the improvementof soil water conservation functions in purple soil sloping fields by planting Pure and mixed stands of Sabaigrass vegetation is synchronous with the local raining rhythmand the longer planted the better the effect.

月季动态分析和年际间比较分析指出，龙须草纯种植被和龙须草-林木复合种植植被对紫色土荒山坡地土壤蓄水性能改良效果既与当地降雨节律同步，又呈现出随着处理年限延长而强化的趋势。

The water body was extracted by combining density slicing of TM 5 or TM 7 with the terrain mask produced by DEM. NDVI was used to extract vegetation information, and desertification land and salification land information was extracted by the SAM classification method. Confusion matrix shows that the classification precision is 86.2%.

对TM5/TM7波段进行密度分割，结合DEM数据生成的模板提取水体及盐漠信息；利用NDVI提取植被信息；通过光谱角分类法提取沙化土地和盐渍化土地信息。

The main points are: groundwater level has descended to an obvious extent; nature vegetation has been degenerated completely; groundwater salination degree has increased along the Tarim River and relevant regions; desertification has developed quickly, wind-sandy disaster has been seriously increasing.

因此从恢复生态学角度深入探讨受损生态系统，建立天然植被生态系统的脆弱性评价指标体系，提出受损生态系统人工恢复与重建措施对塔里木河流域生态治理具有重要的理论与实践意义。

Minqin Basin has been undergoing a rapid decline of underground water level and a quickening process of desertification, salinification and vegetation degeneration that have greatly affected human behavior in water use, especially in agricultural production and farmers' health.

该地区地下水位迅速下降，沙漠化、土壤盐渍化、植被衰退过程加快，这些生态环境变化对人类的生产、生活造成了重大而深刻的影响，并对人类身体健康造成了持久的危害。

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 annual average density was 14.63 per hectare in saline algae zone, 7.50 per hectare in Scirpus marqueter/Scirpus triqueter zone and 1 .59 per hectare in reed zone;(4) The avian community similarity in between adjoining stages of vegetation succession was higher than that in between apart stages.

对不同季节的植被演替阶段鸟类群落相似性进一步比较发现，任何一个季节S_1和S_3的值均分别大于S_2；(5)鸟类群落的多样性与群落中优势种华东师范大学2004届硕L学位论文中文摘要所占的数量比例呈负相关。

British sites with suitable combinations of bittern prey and habitat happen to be mainly Phragmites dominated, but a few nests were found in other vegetation (e.g. Typha, Cladium and Scirpus) and this has been documented elsewhere, particularly in other European countries Gentz, 1965; Gaukler and Kraus, 1965; Bauer and Glutz von Blotzheim, 1966; Bibby

有苦汁牺牲者和栖所的适当的组合的英国站点偶然是被控制的主要芦苇属，即，但是一些巢在其他植被(香蒲、Cladium和地下茎香草)被找到，并且这特别在其他欧洲国家Gentz在别处被提供了， 1965年； gaukler和Kraus 1965年； Bauer和Glutz冯Blotzheim 1966年； Bibby

Nature Evergreen sclerophyllous vegetation consisting mainly of trees and shrubs.

自然植被以常绿硬叶乔木和灌木为主。

As a very special vegetation type in China, Quercus aquifolioides are widely distributed in the Hengduanshan Mountain area, belonging to a type of the sub-alpine sclerophyllous oak forest.

川滇高山栎广泛分布于横断山地区，属于亚高山硬叶栎林，是中国植被非常特殊的类型。

As a very special vegetation type in China, Quercus aquifolioides, a type of sub-alpine sclerophyllous oak forest, distributes widely in Hengduanshan Mountain in Wolong Natural Reserve.

川滇高山栎广泛分布于横断山地区，属于亚高山硬叶栎林，是中国植被非常特殊的类型。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。