查询词典 selection forest

The differences between the edge of canopy gap and interior of forest and the differences between trunk surface temperature at the edge and surface temperature in the center of gap were also analyzed. The findings showed that there were high temperature regions on the east and north of middle vertical active surface of edge. So that the vertical active surface of edge is a new thermal active surface on the vicinage of canopy gap beyond soil surface on the interior of forest, soil surface on the gap, and forest canopy surface.

指出在林窗区域，受太阳直接照射的东侧和北侧林墙中部存在表面温度高值区，是林窗区域除林冠面、林窗地面、林内地面之外的新的第4热力作用面，对探讨林窗区域的热量传输、小气候形成以及林窗边缘植物的侧向生长等均有重要意义。

And the best water-conserving and flood-controlling forest cover is the main index for regional scale diposition. While the small watershed scale should consider the forest type. And the stable forest structure is the key factor for the disposition in slope and gully scale.

指出在区域尺度上，主要以理水调洪森林覆盖率为区域空间配置的指标；在小流域尺度上主要考虑防护林林种的配置方式；而在坡面和沟道尺度上，主要考虑防护林树种和植被群落的稳定林分结构设计。

Through the studies on establishment and application of forest resource managemen information system for country, this paper will certainly cause the forest resources monitoring, checking and the data ordering as well as the forest resources sustainable development plan making and the reasonable use to changes fast, precise, scientific, digital forestry realization could be achieved.

本文通过对县级森林资源信息管理系统的构建及应用研究，必将使森林资源监测、清查到数据整理以及森林资源的可持续发展的规划制订和合理利用变得快速、精确、科学，为实现数字化林业奠定坚实的基础。

A study was conducted in the forest area of Chittagong Forest Division, Chittagong, Bangladesh for developing allometric models to estimate biomass organic carbon stock in the forest vegetation.

在孟加拉的吉大港南部森林地区，利用异速模型评估森林植被的有机碳的储量。

We will investigate the actuality of stony deserts in Guizhou, and divide their types on the basis of their intensity, covering rate of soil and vegetation and amount of species, and stduy the influence factors of forming different stony desert types in more coercing, and explore the ratio of influence factors in the different stony desert areas and the evolutionary mechanism of different stony desert types. Finally,we will stduy the growing conditions and species of arboreous in different geology, land form,hydrology region for natural lithogenic forest and artificial forest, and the natural conditions for failing in many artificial forest,and the reconstruction mechanism in different stony desert type regions.

对贵州石漠现状调查，并根据石漠发育强度、土被、植被覆盖率和物种多少等进行石漠类型分类；对多重胁迫下不同石漠类型形成因子研究，探讨各影响因子在不同类型石漠区的权值；探讨各类型石漠演化机理；选取不同地质、地貌、水文背景区的原生岩生森林及人工造林区对其乔木的立土条件及物种研究；选取贵州经多次造林失败的石山的自然条件研究并探索不同类型石漠区生态重建机理。

The species diversity of Dipentodon sinicus communities in Yushe National Forest Park of Guizhou province was studied based on the quadrate method. The results showed that Rosaceae, Ericaceae, Betulaceae, Fagaceae, Theaceae, Lauraceae, Caprifoliaceae, Cornaceae were the dominant families in D. sinicus communities of Yushe National Forest Park. In the 10 sample plots, there were 8 which were absolutely dominated with D. sinicus population, the importance value came up to 135.69 on average, and it was far higher than the others. For D. sinicus communities, the abundance index (2.847), Simpson index (0.601), Shannon-Wiener index (1.523), probability of inter-specific encounter (0.601) and species evenness (0.569) of the tree layer were lower than those of the shrub layer (5.580, 0.830, 2.377, 0.829, 0.672, respectively) on the whole. It markedly showed a species diversity characteristic of the mixed broadleaved evergreen and deciduous forest in middle subtropics. In the 10 sample plots, the species diversity level of Q1 was the highest, followed by Q3, Q5 and Q6 was the lowest.

摘要运用样方法对贵州省玉舍国家级森林公园稀有保护植物十齿花群落的物种多样性进行了研究，结果表明：玉舍国家级森林公园十齿花群落以蔷薇科、杜鹃花科、壳斗科、桦木科、山茶科、樟科、忍冬科、山茱萸科等为优势科；10个样地中有8个样地以十齿花种群占绝对优势，其平均重要值高达135.69，远远高于其它种群；十齿花群落乔木层物种丰富度为2.847、Simpson指数为0.601、Shannon-Wiener指数为1.523、种间相遇机率为0.601、均匀度指数为0.569，总体上均小于灌木层(分别为：5.580、0.830、2.377、0.829、0.672)，表现为较明显的亚热带常绿落叶阔叶混交林的物种多样性特征。10个样地中，Q1的物种多样性程度最高，Q3次之，Q5和Q6最小，多样性程度最低，10个样地的物种多样性排序为Q1＞Q3＞Q9＞Q7＞Q2＞Q4＞Q10＞Q8＞Q5＞Q6。

This exerts negative influences for the sustainable development of coastal protection forest system. Many researchers focus their studies on the rational structure and function of sustainable coastal protection forest of Casuarina equisetifolia, try to reveal the contributing factors to cause low-value and low-effective forest and probe into its mechanisms.

鉴于此，木麻黄防护林可持续经营问题引起了国内外许多学者的普遍关注，开展防护林生态系统结构和功能的研究，阐明木麻黄低质、低效林的成因及其发生、发展的生理生态机制，从而为木麻黄防护林的合理经营提供科学依据，是沿海防护林工程建设的迫切任务。

The forest is composed mainly of the families, Rubiaceae, Myrtaceae, Myristicaceae, Lauraceae and Euphorbiaceae, and dominated by tree species, Metadina trichotoma, Syzygium cathayense, Knema erratica and Paramichelia baillonii. In physiognomy, the forest is characterized by the trees with mesophyllous, entire and leathery leaves. Woody lianas are found dominant, but trees with buttresses and cauliflory are relatively few in the forest.

结果显示，勐养山地雨林主要由茜草科、桃金娘科、肉豆寇科、樟科、大戟科等植物种类组成，以黄棉木、华夏蒲桃、假广子及山桂花为乔木优势种；群落乔木层以中叶、全缘、革质、尾尖、常绿植物占优势，灌草层植物则以中叶、全缘、纸质叶植物为主；藤本植物中以木质藤本占优势，板根和茎花现象少见。

Almost all the vegetation types occurred in a small study area, so the present study was typical and representative. The results show that the corrosional ratios of different vegetation types at different elevations are quite different. In general, the corrosional ratios increase gradually from the forest land of Shuifang spring, through the bamboo forest land of Shuifang, the meadow of Shuifang and the forest of Bitan spring, to the shrub of Bitan spring.

测试结果表明不同植被条件甚至同一植被类型下不同海拔下岩溶区石灰岩标准试片的溶蚀速率都存在较大差异，5个测试点溶蚀量由大到小依次为水房泉竹林地、水房泉林地、水房泉草地、碧潭泉林地、碧潭泉灌草丛。

The duration that the micro-climate make people comfort was longer in the mixed forest in spring and autumn; while in summer, climate comfort degree were higher in Platycladus orientalis forest and cotinus coggygria forest.

春、秋季混交林小气候使人感到舒适的时间较长；而夏季小气候舒适程度以侧柏林和黄栌林为高。

The system can be widely used in belt weighing and batching process control,etc.

介绍了基于智能模糊控制的嵌入式配料系统的设计方法，对模糊PID控制过程和系统调零作了重点的讨论，同时给出了PID控制的程序流程图和系统定长调零子程序。

"I dunno," she answered,"but if you show me aroun', I'll recognize it from the lighthouse just outside the porthole."

"我不知道，"她回答说，"如果你能带我转转，我能认出来的，因为灯塔就在舷窗外。"