查询词典 vegetation

When coverage varying from high to low, the parameter a decreasing, and b increasing. The fitted regression equation between total vegetation coverage and runoff duration as following, C = 3.4881nt_p -11.772 (R~2=0.9477). The equation shows that the vegetation is positive correlation to duration, i.e.

高寒草甸产流、产沙的试验结果表明，不同植被盖度的嵩草草甸其产流、产沙过程可以用幂函数R=at~b分布来描述，随着盖度由大变小，方程参数a值逐渐变小，b值逐渐增大；而覆盖度在5％以下的黑土滩，其产流、产沙过程更符合指数函数R=ae~分布。

Based on the heat balance equation of the vegetation canopy layer and the assumption that its short wavelength absorptance, long wavelength emissivity, heat or moisture transfer coefficient, and bulk stomatal resistance are random, uncorrelated variables with normal distribution densities, the theoretical modeling for IR radiance statistics of vegetation canopy surface is presented by Monte Carlo simulation, with the surface radiative temperature statistical distribution given.

根据植被层能量热平衡方程，选取植被短波吸收率、长波发射率、热与水汽传输系数和气孔阻力为独立的随机变量，并假设它们均服从正态分布，利用Monte－Carlo方法，模拟计算了植被表面红外辐射的统计特性。

The sixth part: Studies on the dynamic changes of soil retention function value of ecosystem in YUYANG District. Utilized ERDAS8. 5 to interpret the remote sensing image and get LUCC data and vegetation information of YUYANG District. Utilized R2V5. 5 to digitize administrative map, topographic map, vegetation picture, soil distribution map and meteorological website map. Utilized ARCINFOR8. 3 to change every digitization layer to the same projection, to generate Tyson polygon, to structure DEM and do vector polygon overlay. Utilized ARC VIE W3. 3 to obtain the grid data topographic slope and slope length from DEM data of YUYANG District, and then, turned every coverage layer into grid layer and do grid polygon overlay to gain data about dynamic changes of value of soil retention of ecosystem in YUYANG District, at last, the author analyzed the features of the spatial-temporal changes and its reason.The seventh part: Studies on the dynamic changes of fixing drifting sand against wind function value of ecosystem in YUYANG District.

第六部分：榆阳区生态系统土壤保持功能价值动态变化研究；利用ERDAS8.5对遥感数据进行解译获得榆阳区土地利用数据和植被信息，利用R2V5.5数字化榆阳区政区图、地形图、植被图、土壤分布图及气象站点分布图，利用ARCINFOR8.3对各数字化图层进行投影转换、泰森多边形生成、DEM构建和叠加分析，利用ARCVIEW3.3从DEM数据中获取榆阳区的坡度、坡长面域数据，并将上述各图层格网化，然后通过栅格图层叠加分析和代数运算获取榆阳区生态系统土壤保持功能物质量和价值量时空动态变化数据，最后分析了其变化的时空特点及形成原因。

The pressure on vegetation front surface is larger than that on back surface. And the pressure difference decreases with the lying of vegetation, while viscous force increases.

作用在植被叶片迎水曲面上的压力都大于背水曲面上的压力，且其压力差随着植被俯卧程度的增大是依次减小，而切应力依次增大。

After elementary surveying on the status quio of wilding vegetation resources in Maowusu Sandy Land, the paper analysis's the succession law of plant community and the evaluates exploitative situation of wilding vegetation resources.

根据对毛乌素沙区的实地考察，初步调查了该区的野生植物资源状况，结合野生植物资源类型的调查，对其沙生植物种群的演替规律和开发利用进行了分析和评价。

Xerophytic vegetation; xeromorphic vegetation; xerophious plant; xerad; xerophyte

名词 n.1。在干旱基质上生长的由旱生植物构成的植被。

In numerical stimulation, flow field, flow velocity distribution and total pressure distribution on vegetation surface were studied around vegetation of three different statuses, i.e. vertical, acclivitous and lying.

通过数值模拟计算，研究了直立、倾斜和卧倒三种不同状态下植被周围的流场特性、流速分布特性以及植被表面总压强分布。

Miscamthus floridulus, Arundo donaxl, Artemisia argyi, Comnyza Canadensis, Crotalaris mucronata, and Kummerowia striata, are pioneer plants for vegetation recovery in coal piles. They have high summed dominance ratio and take crucial action on vegetation recovery and community succession. Many pioneer plants including annual and perennial herbs, e.g. Imperata cylindrical, Comnyza Canadensis, and Crotalaris mucronata colonize successfully to provide conditions for colonization of shrubs, e.g. Buddleja asiatica.

耐贫瘠、广布性植物如五节芒、荻芦竹、艾蒿、小飞蓬及豆科杂草猪屎豆、鸡眼草等是煤矸石堆植被恢复重建的先锋植物，它们在群落中综合优势比较大，对植被重建和群落演替起决定性作用；许多一年或多年生草本植物，如白茅、小飞蓬、猪屎豆等先锋植物的成功定居，为驳骨丹等灌木的入侵创造了条件。

In this thesis, research on alleviation of autotoxicity by planting mixture of Chinese fir and Broadleaf trees and developing undergrowth vegetation were also done. The results showed that Michelia macclurei and Cinnamomum camphora had positive allelopathic effect on the growth of Chinese fir saplings and developing undergrowth vegetation improved soil decline of Chinese fir plantation.

另外，论文还从植物化感作用的角度，对克服杉木人工林连栽障碍的其它生产措施，如营造混交林及人促林下植被的发育生长，进行了研究：提出了与杉木化学生态关系良好的两种伴生树种，并从化感作用角度证明人促林下植被发育有利于克服杉木人工林的连栽障碍。

Research progresses have been performed during the past decade in the following aspects: ecologicaldatabase development, climate and its variability, ecophysiological response of plants to environments,vegetation and landscape changes, biodiversity patterns and their changes, plant functional types and traitswith relation to climatic gradient, productivity and carbon dynamics, pollen-vegetation relationship, tracegas emissions, land use and land cover changes, as well as biogeographical and biogeochemical modelling.

在过去的10年里，中国东北样带的研究进展表现在以下几个方面：生态数据库发展、气候及其变异性、植物对环境的生态生理响应、植被和景观变化、生物多样性格局及其变化、植物功能型和植物性状及气候梯度分析、生产力和碳动态、花粉-植被相互关系、痕量气体放散、土地利用和土地覆盖变化以及生物地理和生物地球化学模拟。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐