查询词典 index forest

Second, make up the index system and size-up measure and size up the Forest ecology environment value of periphery mountainous land of Guanzhong further by the way of combined quantity and quality.

其次，在森林价值理论研究的基础上，构建了森林价值研究的指标体系以及估算方法，并以关中周边山地为对象，运用定量与定性相结合的方法，对关中周边山地森林生态环境价值进行了价值估算。

Thirdly, The mathematics model of forecasting low flow was established in Fengcong and Fenglin regions according to these factors influencing the amount of low flow in karst drainage (the area of drainage, lithology, the type of landforms and its special assembly and forest)The conception of low water resources carrying capacity was firstput forward according to the changing law of low water resources in space and the situation of exploitation and utilization in karst drainage (ie, under the condition of the virtuous ecological environment and the available technology, the explorable amount of water resources in certain areas is capacity and limitation which is able to coordinate the development of population, enviroment and economy during the period of low flow seasons) and preliminarily analyzed its connotation, characteristic and established the index system of low flow in karst drainage.

根据喀斯特流域枯水资源的空间变化规律以及实际开发利用状况，首次提出了枯水资源承载力的概念，即在枯水季节期间，保持良性的生态环境和现有的技术条件下，某一区域内可开采的水资源量对支持该地区人口、经济与环境协调发展的能力和限度。

In this study, 22 ground field plots were set up in the leucocephala invasion areas. Important value index and Two-way indicator species analysis were used. According to the levels of invasion of leucocephala that can be divided into three forest types: Vitex negundo-Leucaena leuococephala type, Acacia confuse-Leucaena leuococephala type and Murraya paniculata-Leucaena leuococephala type. The companion plants are Acacia confuse, Vitex negundo, Bridelia monoica, and Melanolepis multiglandulosa.

本研究於银合欢入侵区域，设置22个地面调查样区，利用重要值指数及双向指标种分析，得知银合欢入侵，依入侵程度不同可分为埔姜－银合欢型(vitex negundo-Leucaena leuococephala type)、相思树－银合欢型(Acacia confuse-Leucaena leuococephala type)及七里香－银合欢型(Murraya paoiculata-Leucaena leuococephala type)三型，而主要伴生树种为相思树、埔姜、土密树、虫屎等。

In this paper a method with Peason two-tailed bivariate correlations and Cluster analysis was applied for the determination of soil quality index of urban forest soil.

本文以城市森林土壤为研究对象，探讨了土壤肥力指标的筛选方法。

After analysis of TM/ETM+ datas advantage over the forest change detection, Tasseled Cap transformation, Principal Component Analysis and Normalized Difference Vegetation Index were chosen to enhance the vegetation spectral information.

在分析ETM+数据在森林资源监测中的优势的基础上，通过缨帽变换、主成分分析和植被指数法增强植被光谱信息，结合专家分类系统对沿海防护林主要树种进行提取。

It's necessary to have a simple and systematic digital model in thinning decision-making. In the paper, the tree location map of 150 m x 30 m Luanta-fir in Hui-Sun Forest Experimental Station were digitized in GIS and thinning simulation by random, Telathaki-Wadali-Chi, DBH class and crown competition index method.

本研究系利用GIS 配合林木位置图，以惠荪林场之150m x 30m 香杉采穗园为研究材料，以生产大径材为目的的考量下，针对疏伐木之选择，利用随机法、寺崎渡氏法、胸径级法、树冠指数法等四种方法加以模拟、评估、探讨。

"There is a close relationship between the improvement of the air cleaning index and the construction of forest city."

&空气清洁度的提高，与建设森林城市工作密不可分。&

Forest Ecosystem Health Index classification in China.

生态系统健康及相关的概念逻辑上的比较与推断。

This research provides one scientific and effective method to solve the complex problem how to evaluate index system of forest ecological harvesting.

本研究为解决森林生态采伐系统评价这一复杂问题提供了一种科学、有效的评价方法和工具。

It is also an important index to reflect forest quality and ecological situation.

森林自然度反映现实森林类型与地带性原始顶极森林类型的差异程度，是反映森林质量和生态状况的一项重要指标。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。