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forest characteristic
相关语句
  森林特征
     Forest characteristic detection with Pol-SAR
     极化SAR遥感中森林特征探测
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  “forest characteristic”译为未确定词的双语例句
     The study based on forest characteristic map at 1990 and remote sensing image map at 2001 showed: the decline of Pinus sglvestris Var. mongolica forest is pricking up interval 11 years, the leading reason is forest fire;
     通过对1990的林相图和2001年的遥感影像图的研究表明:11年间整个研究区域斑块数增多,大小斑块间差异较大,斑块形状较复杂,自相似程度低,破碎化程度加深,区域总体结构复杂;
短句来源
  相似匹配句对
     forest .
     林。
短句来源
     Forest characteristic detection with Pol-SAR
     极化SAR遥感中森林特征探测
短句来源
     On the Characteristic Parameters of Nutrient Cycling in Forest Ecosystem
     森林生态系统养分循环特征参数研究
短句来源
     Forest and Agriculture
     森林与农业
短句来源
     To compare characteristic
     区域产业集群特色竞技
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  forest characteristic
Open-stand structure of ponderosa pine forest characteristic of presettlement conditions.
      


This paper describes the natunal forest characteristics of Fraxinus mandshurica, and based on the theory of population variation stand selection of colony is conducted by the selective method of phenotype, and Analysis is conducted by number theory I and sets up mathematical model. The relationship among facters which effects stand productivity and yield, and quantity indexes of colony productivity of different stand is made.

本文叙述了水曲柳天然林特性,以种群立异理论为基础,采用表型选择方法进行林分群体选择,并应用数量化理论Ⅰ进行计算分析,其数学模型是:同时分析了影响林分群体生产力、单株营养面积产量的诸因子间相互关系。以林分中水曲柳立木密度(株/ha)为基础,制定了不同等级林分的群体生产力定量指标。

The administration of forest "two-crises" must follow the forest capital operative law and the cyclic system of forestry fund suitable to forest characteristics and the forest financial ac-cunting system. Establishment of special forest bank; arranging an orderly financial system; raise the depreciation rate of fixed assets; and reform the depreciation system of the enterprise are also effective.

治理林业“两危”必须遵循林业资金运动规律,建立适合林业特点的资金循环体制和营林会计标准体系;建立林业专业银行;理顺财政体制;提高固定资产折旧率,改革企业折旧制度。

The industrial revolution in the 19 th century had brought the environmental catastrophe for the Europe,which almost resulted in the disappearance of the original forests in the whole European continent.Again,the phenomena of forest decline such as defoliation,discoloration,susceptibility to the environmental change, etc.appeared in the recent two decades in many European countries have sounded an alarm to the people.It is still needed to pay much attention to the problem of forest wealth...

The industrial revolution in the 19 th century had brought the environmental catastrophe for the Europe,which almost resulted in the disappearance of the original forests in the whole European continent.Again,the phenomena of forest decline such as defoliation,discoloration,susceptibility to the environmental change, etc.appeared in the recent two decades in many European countries have sounded an alarm to the people.It is still needed to pay much attention to the problem of forest wealth and environmental change(pollution).There are many aspects cause the phenomena of forest decline in the Europe today,which include natural factors such as climatic change,natural diseases and insects,as well as anthropogenic factors such as air pollution, these factors individually or together effect on forests and cause the stresses to the forest growth.As these stresses increase with the time,some phenomena of forest decline with ending of death appear obviously.This paper summaries the studies on forest decline and the studies on the effects of air pollution on the forests in Europe in the last decade, and the following three aspects are highlighted:(1)the direct and indirect impacts of the air pollutants on the forests, direct impact means the physiological and ecological function changes of forest canopy(leaves) caused by direct contact with pollutants,and indirect impact means the effect through soil chemical and microbiological properties changes(soilmediated);(2)the forest ecosystem responds to the air pollution,e.g.the changes of forest characteristics due to the long term air pollution;and (3)the main study topics in the future.

综述了近 1 0年来欧洲大气污染对森林影响的有关研究结果 ,主要阐述了以下 3方面的问题 :(1 )大气污染物对森林的直接和间接作用 ,直接作用是指大气污染物直接与林冠 (叶子 )接触、交换而带来林冠生理、生态功能的改变 ;间接作用是指通过对土壤化学、微生物特性的影响 ,从而影响森林生长。(2 )森林生态系统对大气污染的反应 ,即森林在受较长时间的大气污染影响之下而产生的生长特点、地被物组成等方面的改变。 (3)今后研究的主要方面

 
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