查询词典 vegetation

Based on the climate effect of the vegetation and soil moisture around Tibet plateau, this paper studies the impact of different surface covers on regional climate, and the physic machines of vegetation action on climate and water cycle.

在研究了青藏高原及其周围地区植被、土壤湿度气候效应的基础上，探讨了长江流域不同地表覆盖类型的区域气候的作用、植被对气候和地—气系统水循环的影响，揭示了植被对气候和水循环作用的物理机制。

The results indicated that there was an ecological succession of wetland plant communities and that the successive series is as follows: aquatic plant→helophytes→swampy prata→herbosa with the changes of habitat from aquatic to mesophytic. The horizonal distribution regularity of plant communities showed symmetric distribution at loop lake or banks of small stream and con centric distribution at depression. The vertical distribution regularity is as follows: aquatic vegetation→moor vegetation→swampy prata vegetation→subalpine meadow subalpine shrub from the center of lake to the hilltop.

结果表明，随着湿地水分由多到少的变化，植物群落类型发生相应的生态演替，其演替序列为水生植被→沼生植被→沼泽化草甸植被→草甸植被，且在水平方向呈对列式和同心圆式分布；从湖心至丘顶的垂直分布规律表现为水生植被→沼泽植被→沼泽化草甸→亚高山草甸→亚高山灌丛。

The rehabilitation mechanism of bush vegetation is to increase bio-diversity and community stability, improve and make full use of the eco-economic benefits of forests for conserving water resources in line with the law of vegetation succession and by means of artificial auxiliary measures The successive sequence of bush vegetation is Vitex negundo var.

灌丛植被的恢复机理是以植被演替规律为依据，通过人工辅助措施提高植被的生物多样性和群落稳定性，改善和充分发挥其水源保护功能和生态经济效益。

But at the same time,itexisted in the fact that the water environment was amended,showingthat many lakes and ponds such as Hong Jiannuo Lake appearing andexpanding in the end of Qing dynasty.4.The vegetation in Mu Su Desert passed through several phases inhistorical times,the main phases are:the species composition ofvegetation community was gradually simplified;xeromorphous and sandyplant increased;the status of desert vegetation rose evidently.However,the change of vegetation zonation means that forest plainchanged into drought plain did not occur.5.The main modality of Mu Su Desert land degenerating has beendesertification,it had occurred before human activities intervenedintensively.Two-thirds of land has been desertification at variousdegrees.

但与此同时，也存在着局部的水环境改善，突出表现为红碱淖等湖沼在清末民初的出现和扩大。4、毛乌素沙地的植被在历史时期经历了群落种类组成渐趋简单、旱生沙生资源植物增加、荒漠植被地位明显上升等变化，但是并不存在由森林草原到干草原的地带性植被变化。5、沙漠化是毛乌素沙地土地退化的主要表现形式，在人类活动强烈干预以前就存在着，秦汉以来，有大约2／3的土地发生了程度不同的沙漠化。

In the case study of Plain, the TM image was processed with Tasseled Cap, Principal component analysis and Normalized Difference Vegetation Index extraction, prieror to vegetation classification, The imageries after preprocessing were use to identify the vegetation combined with original TM bands.

对平原地区的植被分类研究，首先对获取的TM影像进行Tasselled Cap处理、PCA处理和NDVI植被指数提取，处理后的各影像与TM原始六个波段影像一起用于植被遥感分类。分类采用监督分类和非监督分类方法，其中TC处理、PCA处理、NDVI影像、TM1-5，7组合影像采用非监督分类，原始TM6波段组合影像和TM3、4、5三波段组合影像采用监督分类。

In order to understand and know about the basic principle and quantification relationship of greenhouse phalaenopsis during vegetating phase and forecast the dynamic action of vegetation system so as to assist reasonably regulating and controlling on the vegetation and production system of phalaehopsis real time, a dynamic vegetation model of greenhouse Phalaenopsis is created on the solar radiation as the basic driving factor and a computer simulation system is developed on Windows XP system.

为了对温室蝴蝶兰生育过程的基本规律和量化关系有一个清楚的理解和认识，并对其生长系统的动态行为进行预测，从而辅助进行对蝴蝶兰生长和生产系统的适时合理调控，研究建立了以太阳辐射为基本驱动因子的温室蝴蝶兰生长发育动态模型，进一步开发出基于WindowsXP的计算机模拟系统。

Data from TM images from the years1986,1993, 2000 and 2006 around Shenfu coalmine area were used to exbract normalized difference vegetatio n index by the software ERDAS firstly, then using spatial modeler of ERDAS compute vegetation fr action and classify through unsuperˉ vised classification.Finally,we get vegetation fraction mapping of c oalmine within 1986～2006.It clearly inˉ dicate that the coalmine vegetation fraction increase in whole but d ecrease in some colemine district.

通过利用榆林市神府矿区1986、1993、2000、2006年四景同期TM影像数据，使用ERDAS软件首先提取植被指数，根据像元二分法利用ERDAS的建模工具Spatial Modeler计算出矿区的植被覆盖度，利用非监督分类方法对矿区的植被覆盖度进行分类、赋色，最后得出矿区1986～2006年的植被覆盖度分类图，定量的说明了矿区20 a年间的植被覆盖变化情况：植被覆盖度整体提高，在局部矿区则有所降低。

Using the two aerial remote sensing images of 1980 and 2001, the vegetation types of conifer, broadleaf hardwood, frutex, etc. were abstracted. The statistical result shows that the recreation facilities have tight relationship with vegetation area. The establishment of the facilities increased non-vegetation area, and the nudity area increased 21.1%, while the conifer and mixed wood of conifer and hardwood decreased 6.2% and 2.5% respectively.

利用1980年和2001年两期航空遥感图像，提取了针叶林、阔叶落叶林、针阔混交林等植被类型，结果表明旅游设施的修建增加了无植被区域的面积，使裸岩裸地面积增加了21.1%，针叶林和针阔混交林的面积则分别减少了6.2%和2.5%。

Based on the characteristic of the vegetation scatter plots in the redband and near infrared band, this paper mainly aims to probe a new method ofextracting vegetation changes by building the coordinate plane of brightindex-perpendicular vegetation index and then getting the variation vectors.

基于植被在红光波段与近红外波段坐标系中的散点图特征，本文着重探讨了一种通过建立多时相&亮度-垂直植被指数&坐标平面，利用变化向量提取矿区植被变化的方法。

The results showed that the species richness,the speciesdiversity and its biomass of understorey vegetation decreased with the stand age in-creasing.There was the most significant negative-linear relationship between thiskind of changes and age.It is possible that the certain shading condition may benefit to understorey growing better.The richness,diversity index and biomass of thevegetation in eucalypt plantation decreased with CPR increasing,however,after ro-tating by watermelon one rotation,the richness,the diversity index and biomass ofunderstorey in CP stand increased,this result will provide the possibility of therestoration and reestablishment of vegetation in eucalypt plantations.The nutrientstorage of understorey decreased in accord with the productivity decreased withCPR increasing,this is the result which the stand enviroment became worse and thestand stratum competed with the vegetation for the water and fertility of soil.

结果表明，随着年龄的增长，桉树林下植被物种丰富度降低，多样性减少，生物量下降，这种变化趋势与年龄存在极显著的负线性关系；随着造林密度的增加物种丰富度降低，多样性也下降，但林下植被生物量尚有增加，可能是一定程度的庇荫有利于桉树林下植被的生长；随连栽代次的增加，桉树林下植被丰富度降低，多样性指数下降，生物量减少；但在轮作一茬西瓜后的林地，物种丰富度提高，多样性指数升高，生物量增加，为桉树林下植被的恢复与重建提供了可能性；随连栽代次增加，林下植被养分总量逐代下降，与生产力下降一致，这是林分环境恶化后上层乔木和林下植被对水肥竞争的结果。

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