As a result of excessive deforestation and the destruction of other vegetational cover, flood control is becoming increasingly difficult 由于乱砍乱伐以及对其他植被的破坏,洪水控制变得愈来愈困难了
This is the vegetational climate of arctic permafrost regions. 这是北极永冻地区的植物气候。
Palynological records of Xipu section reveal the local vegetational and environmental history within the last16000aBP. 通过对阳原西堡剖面的孢粉分析,得到16000年以来该地区植被与环境发展的历史。
They think that the climate change from wet-hot, warm-wet, little cold-wet, to cold-drought, and the vegetational evolution from forest, bush, to grassland in Zhada area. 结果表明,札达地区上新世-早更新世气候经历了从湿热-温暖潮湿-偏冷潮湿-寒冷干旱的变化,以及植被从森林-灌木-草原的逐渐演化。
Regions rich in vegetal products; vegetational cover; the decaying vegetative layer covering a forest floor. 盛产植物产品的地区;植被;腐烂的植物叶子覆盖了森林的地表。
Preliminary research of vegetational succession on the Song-Nen Plain since late Pleistocene 松嫩平原晚更新世以来古植被演替的初步研究
Vegetational development and climatic changes in the last 10000 years in Beijing 北京地区10000年以来的植物群发展和气候变化
A Study on the Application of the Vegetational Index of NOAA in Meteorological Service for Wheat Production 卫星遥感绿度资料在小麦气象服务中的应用研究
The possibilities and risks by using biodiversity ( particularly vegetational diversity) as a long term strategy to control pest insects were proposed. 利用生物多样性特别是植被多样性作为一种长期管理害虫策略的可行性及风险性;
Holocene vegetational and environmental changes at Mt. luoji, Sichuan 四川西昌螺髻山全新世植被与环境变化
This paper is an experimental analysis on the pollen assemblages of Betula alba-sinensis at Mountain Shennongjia, the relations of its vegetation and its forest vegetational history. 本文是在鄂西神农架山区的红桦林中,进行的孢粉组合与植被关系,及其森林植被历史的实验研究。
On the Vegetational Remaking of Mountainous Region and Hills in the Upper and Middle Reaches of Huaihe River 淮河中上游山地和丘陵的植被改造
Vegetational development and environmental changes in Hulun Lake since late Pleistocene 晚更新世以来呼伦湖地区孢粉植物群发展与环境变迁
Vegetational regions and rational arrangment of agriculture, forestry and animal husbandry in Sichuan province ( abstract) 江河源区植被分区四川省植被分区和农林牧业合理布局(摘要)
However, Some researches on the response of natural enemies to the habitats and vegetational diversity suggested that the movement ability of the natural enemies plays an important role in determining their abundance in diversified agroecosystem. 也有研究认为:生境与植被多样性对天敌数量的影响,天敌本身的运动迁移能力有非常重要的作用。本文还对生境与植被多样性影响节肢动物群落的生态学机制进行了讨论。
Most studies showed that the abundance of the natural enemies increased but that of the arthropod herbivores decreased or be controlled with the enhancing of the habitats and vegetational diversity. 大多数的研究表明:增加系统内生境和植被多样性,能增加天敌的物种丰富度和种群数量,降低或抑制有害节肢动物的种群密度。
This paper discusses the principle and basis, the system and unit of vegetational classification in Pingtan county. According to the general principle and unit of China vegetational classification, the vegetation form in Pingtan may be divided into 10 vegetation-type, 24 formations and 69 associations. 本文论述了平潭县植被分类的原则与依据,植被分类的单位和系统.根据中国植被分类的原则和单位,将平潭县植被划分为10个植被型、24个群系、69个群丛。
Vegetational and environmental changes of Kunlun Mt. pass area since late Pleistocene 晚更新世晚期以来昆仑山垭口区的植被与环境
Vegetational types of the arid valleys in the Hengduan mountainous region 横断山区干旱河谷植被类型
Feature of species diversity and vegetational resources in Dongshan lsland 东山岛植被资源和物种多样性特征
The acting mechanisms of the vegetational diversity on arthropod community were reviewed in this thesis. 本文还对生境与植被多样性影响节肢动物群落的生态学机制进行了讨论。
The influence of algae type eutrophication on aquatic higher plants and hydrophytic vegetational reconstruction in Taihu Lake 太湖藻型富营养化对水生高等植物的影响及植被的恢复
All the vegetation data may provide certain scientific basis for reasonable exploitation of the regional vegetational resources. 所有的植被资料,为合理开发该区植物资源提供了一定的科学依据。
As compared with 8 surface sample pollen analysis of Southern Xizang Plateau, vegetational variations between the steppe and forest are evident in the modern pollen rain. 同藏南8个表土样花粉分析结果相比较,现代花粉雨反映了森林和草原植被的不同。
The Comparison of Community Biomass and Environmental Condition of Five Vegetational Type in Alpine Meadow of Haibei, Qinghai Province 青海海北高寒草甸五种植被生物量及环境条件比较
The indexes of importance value, species abundance and biomass about vegetation community in sand covered and loess region in Wuqi county in different time-interval are analyzed, through investigating the situation of the closed vegetational type. 通过调查吴旗县覆沙黄土区不同时段封禁造林情况,并对此地区植被群落的重要值、物种丰富度、生物量等指标进行分析研究。
The result suggested that the distribution of vegetational type correlated with soil humidity and soil temperature obviously. 研究表明不同植被类型的分布与土壤湿度和温度有很大的关系。
All of the differences were results of vegetational and climatic differences determined by the topography of the Ailao Mountain and the effect of the southwest monsoon. 所有这些差别与哀牢山地理位置,西南季风影响所形成的东西坡植被和气候等环境因素有关。
Climatic coupling between natural vegetational productivity function and zonality structure in China 我国自然植被生产力功能和地带性结构的气候耦合
The content of TOC and TN is in relation to vegetational cover in drainage area and import of terrestrial organic matter and lacustrine biomass. TOC和TN含量与湖泊流域内的植被覆盖度、陆源有机质输入、湖泊生物量有关。