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    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
    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
    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
    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 ;
    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 .
    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.
    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。
    Then,taking square sheltemets as a studying object, some essential conditions for constructing sustainable management model of shelterbelts/windbreaks were presented after analyzing elements of spatio-temporal structure state of sheltemets such as management scale,regeneration ability,regeneration age of shelterbelt and regeneration pattem.
    以矩 (方 )形林网体系作为研究对象 ,分析经营尺度、更新能力、林带更新年龄、更新方式等林网体系时空结构状态要素 ,提出农田防护林可持续经营模型构建的基本条件 ;
    In addition,according to the relationship between networks ring and belt quantity,spatial position and age distribution of shelterbelts were demarcated and quantified,and the distance function among belts to be removed was defined, to give expression to the seperation degree of belts to be regenerated.
    根据林网体系中林带环度与林带数量的关系 ,标定并量化网格中林带的空间位置和年龄结构分布 ,定义了需要更新林带之间的距离函数 ,来表征各林带之间的分散程度 ;
    Taking square shelternets as a studying object, sustainable management model of shelterbelts/windbreaks in the shelternets system was constructed to express the quantitative relationship between functional aim of shelternets system and elements of spatio-temporal structure state of shelternets, by analyzing elements of spatio-temporal structure state of shelternets such as management scale, regeneration ability, regeneration age of shelterbelt and regeneration pattern. In this paper, the model validity was tested to testify the practicability of the model firstly.
    基于林网体系尺度上的农田防护林持续经营模型 ,是以矩 (方 )形林网为对象 ,通过分析经营尺度、更新能力、林带更新年龄、更新方式等林网时空结构状态要素而建立起来的 ,是林网体系功能目标与时空结构状态之间的数量关系表达。
 

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