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作 者 ：张纪林

期 刊 ：林业科学 1997年 33卷 zk1期 页码：91-98

关键词：农田林网；(强)热带风暴；棉花；模糊聚类逐步判别法；有效防护范围；

Keywords:Wmdbreak network, (Violent) tropical storm, Cotton, Fuzzy clustering stepwose analysis,

摘 要 ：为查明沿海重风灾区林网有效防护范围及作物产量防护效果，本文在田间实测资料基础上，应用模糊聚类逐步判别方法，建立农田林网有效防护范围的划分模型，并进行数学模型统计指标检验、棉株空间格局及运动趋势检验、农业检验和实例验证等。结果表明，在强热带风暴条件下，沿海农田林网的有效防护范围为：南北方向距北林带0.42H—23.00H(H为林带平均高度，下同)，东西方向距东林带0.36H—23.00H，占农田林网面积的44.44％。在有效防护范围内，籽棉产量、衣分和皮棉产量比受灾区分别高45.01％、5.30％和52.69％；农田林网的籽棉保产量和皮棉保产量分别增加260.50kg/hm²和107.35kg/hm²，保护率分别为21.05％和24.65％。复合农田林网的有效防护范围更大，保护效果更好。

Abstract:The protective effect range of windbreake networks for cotton production area，which was exposed to violent wind storm, was divided into the damaged zone and protective by fuzzy dustering stepwise discriminant method．The protective zone is for O.42H-23.00H to northern forest belt in the direction of South-North,and0.36H-0.23H to east forast belt in the direction of East-West．The protective area of simplex windbreak networks accounted for44.44％of the total area．The protective areas of complex windbreak networks increased by 18.76% comparing with the former．The unginned cotton，ginning outturn，and ginned cotton in protected area had increased 45.01%，5.30％，and 52.69% comparing with the damaged area respeetivety．The protection magnitude of the unginned cotton and ginned cotton had increased by 260.50kg/hm² and 107．3Skg/hm² in the complex winworks networks with the protective per-centage of 21.05% and 24.65% respectively．

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