查询词典 timber forest

According to the method of branch relative growth curve,the first pruning of Larix olgensis is about 15 years and the intension is about 40%to 50%.These results can provide theory base and management method for improving forest increment and timber quality which is of great significance.

本项研究将在提高我国落叶松人工林林木生长量，干形控制和木材质量方面提供坚实的理论基础和经营方法，具有重要的理论和现实意义。

The data of forest inventory and stem analysis were used to build models about diameter breast-high, high of tree, volume of single timber, stand volume, and these models were correlative to age and stand density. The models were transforming into three-dimension graphs, and the stand growth processes were simulated to visual images.

利用林分调查和解析木数据建立了具有一定适应性的湿地松纸浆林胸径、树高、单株材积和林分蓄积模型，对生长模型进行了图形化表达，并对林分生长过程进行了可视化模拟再现。

Erect forest tree of Cuba and Jamaica having variably hairy leaves and orange-yellow or orange-red flowers; yields a moderately dense timber for cabinetwork and gunstocks.

古巴和牙买加的竖直的森林树种，有易变的多毛的树叶和橘黄色或橘红色的花，为细木工和枪托产生一种中等密度的木材。

Clear-cutting is favored by the timber industry over the alternative, selective cutting of individual trees in a forest, for several reasons.

相比在一片森林中有选择性的砍伐树木，伐木公司更偏爱皆伐，有几方面的原因。

Clear-cutting large areas of forest at once and constructing steep switchback roads to harvest the timber have resulted in erosion and stream habitat destruction.

为了木材而大面积彻底砍伐森林以及修建陡峭的山路造成了水土流失和河流生态系统的破坏。

The exploitation of huge areas of virgin forest in both Sichuan and Yunnan provided timber and land for agricultural use but also exposed substantial reserves of crocidolite.

四川省和云南省大面积的原始森林开发不仅提供了木材和农用耕地，还使大量的石棉矿暴露在外。

The first magician hit the ground with his staff, and in the midst of the forest depth appeared a magic glade, surrounded by timber.

第一魔术师撞到地面与他的工作人员，并在一片森林中的深度出现了神奇的沼地，围绕着木材等。

Rajan is one of the few elephants in Havelock that can swim, so when he is not dragging timber in the forest he is used as a tourist attraction.

拉詹在哈夫洛克是可以游泳的几个大象之一，因此，当他没有拖动，他是作为一个旅游胜地用林木材。

Until very recently, the two largest pulp manufacturing groups on Sumatra used timber from natural tropical forest as the primary source of their pulpwood.

直到最近，苏门答腊岛上两个最大的纸浆生产集团还在采用天然的热带森林木材作为他们纸浆的主要来源。

Since 1998, China has worked on projects to protect natural forest reserves, to reforest cultivated land, to build shelterbelts in northern, northeastern and northwestern China and in the Yangtze River basin, to control the sources of duststorms in the Beijing-Tianjin area, to build wild animal and plant reserves and other types of nature reserves, as well as fast-growing, high-yielding timber bases in some key areas.

从1998年起，中国开展了天然林资源保护工程、退耕还林工程、"三北"及长江流域等防护林体系建设工程、京津风沙源治理工程、野生动植物保护及自然保护区建设工程和重点地区速生丰产用材林基地建设工程等。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。