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林网体系
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  “林网体系”译为未确定词的双语例句
     Sustainable management model of shelterbelts/windbreaks in the shelternets systemⅡ—Application
     基于林网体系尺度上的农田防护林持续经营模型Ⅱ——模型的应用
短句来源
     Sustainable management model of shelterbelts/windbreaks in the shelternets systemⅠ.——Model contruction
     基于林网体系尺度上的农田防护林持续经营模型Ⅰ——模型的构建
短句来源
     In Poyand Lake region which is the important grain producing area in Jianxi, a shelter forest system should be built.
     对于江西省重要产粮区──赣北鄱阳湖区来说 ,则应尽快建立以防风护田林为主体的林网体系
短句来源
     For networks system, there are 4 ind ices can be used for measuring management state of networks such as ratio of she lterbelt to patch, networks connectivity, networks ring, and networks dominance.
     对于林网体系 ,用林网带斑比、林网连接度、环度、林网优势度等可作为度量林网经营状态的指标 ;
短句来源
     The s e indices and criteria, which become as foundation of measuring sustainable mana gement and direct highly effective management of shelterbelts/windbreaks, can be used to evaluate the management of shelterbelts, not only in distribution of ne tworks but also in structure of single belt.
     这些评价指标及其标准 ,在宏观上确定了主要林网体系的布局 ,在微观上确定了单条林带的结构 ,成为衡量是否可持续经营的依据 ,为其高效多功能经营提供了导向 .
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     248 from both.
     248体系
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     World-system
     世界体系
短句来源
     Sustainable management model of shelterbelts/windbreaks in the shelternets systemⅡ—Application
     基于林网体系尺度上的农田防护林持续经营模型Ⅱ——模型的应用
短句来源
     Sustainable management model of shelterbelts/windbreaks in the shelternets systemⅠ.——Model contruction
     基于林网体系尺度上的农田防护林持续经营模型Ⅰ——模型的构建
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The temporal and spatial law of the spring low temperature in Jiangxi province is analysed. It is shown that the time when it is getting warm again after a cold spell in spring is influenced by latitude, elevation, and landform, and consequntly differs in different places and different years. For reducing the cold hazard to the crops in spring the safety sowing time of early rice should be correctly determined and the countermeasures against the cold damage should be suited to local conditions. In Poyand Lake...

The temporal and spatial law of the spring low temperature in Jiangxi province is analysed. It is shown that the time when it is getting warm again after a cold spell in spring is influenced by latitude, elevation, and landform, and consequntly differs in different places and different years. For reducing the cold hazard to the crops in spring the safety sowing time of early rice should be correctly determined and the countermeasures against the cold damage should be suited to local conditions. In Poyand Lake region which is the important grain producing area in Jianxi, a shelter forest system should be built.

通过对江西省春季低温时空分布特点的分析 ,指出江西省春季回暖的迟早既受纬度影响 ,也与海拔、地形、地貌等诸多因素有关 ,各地不同 ,各年也有差异。必须结合本地实际情况 ,确定早稻安全播种期 ,并采取一定措施可有效防御春季低温给江西农业带来的危害。对于江西省重要产粮区──赣北鄱阳湖区来说 ,则应尽快建立以防风护田林为主体的林网体系

From the two scales of single shelterbelt and networks as research object, this paper constructed the indices system of highly effective and multi functional m a nagement of shelterbelts/windbreaks. Through analyzing the mechanism relationshi p among every index, 9 main evaluation indices of shelterbelts/windbreaks were p ut forward. For single shelterbelt, there are 6 indices can be used for measurin g management state of shelterbelt, such as porosity, effective protection distan ce, initial protection maturity...

From the two scales of single shelterbelt and networks as research object, this paper constructed the indices system of highly effective and multi functional m a nagement of shelterbelts/windbreaks. Through analyzing the mechanism relationshi p among every index, 9 main evaluation indices of shelterbelts/windbreaks were p ut forward. For single shelterbelt, there are 6 indices can be used for measurin g management state of shelterbelt, such as porosity, effective protection distan ce, initial protection maturity age, total protection maturity period, ratio of output to invest, and regeneration pattern. For networks system, there are 4 ind ices can be used for measuring management state of networks such as ratio of she lterbelt to patch, networks connectivity, networks ring, and networks dominance. According to quantitative boundary of main indices, the criteria of highly effe ctive and multi functional management of shelterbelts were brought forward. The s e indices and criteria, which become as foundation of measuring sustainable mana gement and direct highly effective management of shelterbelts/windbreaks, can be used to evaluate the management of shelterbelts, not only in distribution of ne tworks but also in structure of single belt.

从单条林带和林网两个尺度出发 ,建立了农田防护林高效多功能经营的指标体系 ,并通过分析各个指标之间的机理关系 ,提出了 9个主要评价指标 .对于单条林带 ,用林带疏透度、有效防护距离、初始防护成熟龄、防护成熟期、林带产投比、更新方式等可作为度量林带经营状态的指标 ;对于林网体系 ,用林网带斑比、林网连接度、环度、林网优势度等可作为度量林网经营状态的指标 ;依据主要指标的数量化界定 ,提出了农田防护林高效多功能经营的标准 ,可进行综合评价 .这些评价指标及其标准 ,在宏观上确定了主要林网体系的布局 ,在微观上确定了单条林带的结构 ,成为衡量是否可持续经营的依据 ,为其高效多功能经营提供了导向 .

As the important measure of ecological construction,farmland shelterbelts are the ecological protection screen of agriculture, which are of great importance to keep ecological security and improve the quality of living environment for human. The paper reviews the status and development of study on characteristics of ecological effects of farmland shelterbelts, focusing on the major aspect such as effects of shelterbelts on wind structure and soil erosion, physical characteristics in the boundary layer of shelterbelts...

As the important measure of ecological construction,farmland shelterbelts are the ecological protection screen of agriculture, which are of great importance to keep ecological security and improve the quality of living environment for human. The paper reviews the status and development of study on characteristics of ecological effects of farmland shelterbelts, focusing on the major aspect such as effects of shelterbelts on wind structure and soil erosion, physical characteristics in the boundary layer of shelterbelts system, and adjustment of shelterbelts on crop growth environment. On the base of analyzing the existing problems of this field, some keystones and hotspots of study on characteristics of ecological effects of farmland shelterbelts in the future are put forward to provide useful help for research and development of this study.

农田防护林作为生态建设的重要措施,是农田生态系统的屏障,对生态安全与人类生存环境质量的提高有重要的意义。围绕农田防护林对风速结构及风蚀驱动力的影响、林网体系边界层气流物理特征以及对作物生长环境的调节作用等方面,综述了农田防护林生态作用特征及其研究现状与发展。在此基础上分析了农田防护林生态作用特征研究中存在的主要问题,提出了今后农田防护林生态作用特征研究重点与研究热点,对农田防护林学这一学科的深入研究与发展方向提供了有益的借鉴。

 
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