【摘要】 在农田防护林可持续经营内涵与目标分析的基础上 ,提出农田防护林可持续经营的理想结构 ;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 ;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 ;根据更新林带在林网体系内时空分布的均匀性 ,构建了农田防护林可持续经营模型。更多还原

【Abstract】 On the basis of analyzing the definition and aims of sustainable management of shelterbelts,the ideal structure of sustainable management of shelterbelts/windbreaks was put forward firstly.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. 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.Furthermore,a sustainable management model of shelterbelts/windbreaks was constructed to arrange the large area shelterbelts in the temporal and spatial scale by the even degree of regenerated belts distributed in the shelternets system,and determine the transition of distribution state and dynamic process of age structure.更多还原