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中文摘要: 利用三北防护林体系建设前后华北地区长期定点观测资料,对该地区春季生态环境的变化进行了对比分析。分析表明,防护林体系建设以后,除日照有所减少、温度日较差减小对春季农作物生长有一些不利影响外,其它生态环境因子都是向着有利于作物生长和改善生存环境方向变化的。
中文关键词: 生态环境，三北防护林，作物生长
Abstract:Contrast analysis was undertaken in the period before and after the construction of Three North shelterbelts system,by using the long term observations over north China.The results show that the shelterbelts system is beneficial to the plant growing and living conditions improvement,but the sunshine duration is shorter and the diurnal range of temperature is smaller after the construction of the shelterbelts system,which has more or less disadvantages on the crop in spring.
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基金项目:国家自然科学基金项目(49975016)资助
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引用文本：
钟中,王汉杰,2001.三北防护林体系建设前后华北春季生态环境对比[J].气象,27(9):13-17.
,2001.Contrast Analysis of Ecoenvironment in North China before and after Construction of Three-North Shelterbelts System[J].Meteor Mon,27(9):13-17.
钟中,王汉杰,2001.三北防护林体系建设前后华北春季生态环境对比[J].气象,27(9):13-17.
,2001.Contrast Analysis of Ecoenvironment in North China before and after Construction of Three-North Shelterbelts System[J].Meteor Mon,27(9):13-17.