半干旱地区防护林体系健康维护技术试验

Health Maintenance for Shelterbelt System in Semiarid Areas

分别采用诱木法、改善林况及林禽混养等生物措施针对天牛、杨干象等病虫害进行了维持防护林健康技术试验。结果表明:采用易感天牛的诱树营造杨树品种混交林可有效地控制天牛的发生范围,缩小其种群集中分布区,为人工集中捕杀创造了条件;通过半带皆伐改善林况未使杨干象甲感病状态得到有效改善;在林带内放养家禽可使林木感病株率、感虫株率分别减少7%、9%,同时可获得可观的经济收入。

Biological measures （induced trees,improving forest condition and polyculture of forest and poultry） were adopted to conduct experiments for maintaining shelterbelts health to against longicorn beetles, Cryptorrhynchus lapathi. Result shows that：adopting induced trees which were easily affected by longicorn beetles to create varieties of poplar forest can effectively control occurrence of longicorn beetles;reduce of its population concentrated area could create conditions for artificial concentrated hunting; forest conditions of Cryptorrhynchus lapathi can＇t im- prove effectively through half-band clear cutting;mortality index, insect-infected trees decrease by 7 % ＆ 9 % respec- tively with free-range birds in shelterbelt; substantial economic income can be obtained at the same time.