调整林网结构发展农田防护林李占文王少华随着我区第一代农田林网因“天牛”危富而被迫砍伐和部分更新，第二代农田林网建设势在必行，现在有些县（市）已全面展开大规模的营造工作．在建设第二代农田林网中要吸取第一代农田林网的教训，应根据不同地区类型的土地环境和气... Adjust the structure of the forest network to develop farmland shelter Li Zhanwen Wang Shaohua With the first generation of farmland in our area Lin network due to “Tianniu” dangerous and forced to cut down and partially updated, the second generation of farmland forest network construction is imperative, and now Some counties (cities) have started a large-scale construction work in an all-round way. In the construction of second-generation farmland forest network to learn the lessons of the first generation of farmland forest network, according to different types of land environment and gas ...