查询词典 vegetation

Based on the method of dimidiate pixel model and sub-pixel models for vegetation coverage estimation. The current model is improved.

改进方法主要是基于原有模型的两个重要参数，进行重新推导得到。

The research results showed that: The accuracy of dimidiate pixel model is better than that of the experiential model during the vegetation retrieval.The curve degree of the cubic curve fitting is the best during the three built experiential models, but the experiential model is very simple and used widely.

研究结果表明：植被盖度反演中，像元二分模型的精度高于经验模型的精度，在建立的三个经验模型中，又以三次拟合曲线的拟合度最高。

With the quantitative retrieval of vegetation cover, the experiential model is built by NDVI and practical data. According to the theory of the mixed pixel decomposing, NDVIsoyi and NDVIveg are confirmed and the dimidiate pixel model is built.

在对植被盖度的定量反演中，选用NDVI与实测数据建立了经验模型，根据混合像元分解的理论，确定出NDVISOYI和NDVIveg，建立了像元二分模型。

The Three-North Shelter Forest Program covers 13 provinces of China, which brings great influence to the eco-environment of North, Northeast and Northwest China (Three-North Regions). In this paper, the vegetation cover in the Three-North Regions was estimated by using a dimidiate pixel method based on the MODIS-NDVI data in August 2001 and 2007, with its spatiotemporal changes analyzed.

以像元二分模型为基础，构建了基于归一化植被指数的植被覆盖度定量估算模型，并利用MODIS-NDVI时间序列数据，估算了三北防护林工程区2001年8月和2007年8月的植被覆盖度，分析了三北防护林工程区植被覆盖度的时空变化特征。

Sexual systems, particularly dioecy, and the habit correlations were examined for 3052 native angiosperms in Taiwan and 689 species from its outlying Orchid Island, and compared among different vegetation types.

本研究整理3052种台湾和689种兰屿原生被子植物之生殖系统，特别是雌雄异株型，对其与生活型的关联进行讨论。

The percentages of dioecy varied among the six selected vegetation types in Taiwan, from 14.1% in the Linkou Laterite Terrace secondary forest to 23.9% in the Nanjenshan plot, the highest percentage ever found in a forest plot.

另外本研究在检视了六个森林样区中之所有原生被子植物资料，发现其中雌雄异株植物的比例有相当的变异，从林口红土台地次生林的14.1%，到南仁山热带森林的23.9%不等，后者甚至为目前所有发表样区资料中雌雄异株比例最高的地区。

So there were 28 test fields in total. The research results showthat the plant species of soil seed bank has a low relationship with the vegetation in the collecting area, while which has close relationship with the seed disseminative type. The results also show that the tree species, number of germinant plants and the number of surviving plants are very different with the different covering thickness of top soil.

研究结果表明：土壤种子库植物种类组成与表土采集地的植被关联性较低，但与种子散布型关系密切；表土的不同铺撒厚度在木本植物出现的种类、出芽个体数、生存个体数等方面都表现出明显的差异性。

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。

Our country's deserts mainly lie in arid and semiarid areas, mostly with scarce precipitation and lack of water resource, neither natural vegetation with relatively strong drought-resistance capability nor plantation, like diversifolious poplar, dryland willow, shrubby sand willow, saxoul and Hedysarum mongolicum Turcz,etc., can be protected effectively, this leads to desertification area expansion and frequent sand storm, which seriously affect people's work and life.

我国沙漠多处于干旱和半干旱地区，绝大部分地区降水稀少，水资源缺乏，无论是具有较强抗旱能力的天然植被，还是人造林如胡杨、旱柳，灌木类沙柳、梭梭、杨柴等都得不到有效保护，导致沙化面积扩大，沙尘暴发生频繁，给人民群众的生产生活带来严重影响。

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。

And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时，论述了一体化管理体系构建中的几个主要问题，包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。