陕西省飞播造(营)林成效时空动态特征及驱动力分析

Effect Analysis of Aerial Seeding Afforestation on a Spatial and Temporal Basis and Dynamic Driving Forces for Forest Establishment in Shaanxi

根据陕西省1958～2004年间累计41个年度飞播成效调查数据及相关资料,分析了陕西省飞播成效时空动态变化过程和内在动因。表明陕西省各地理区域飞播目标不同,20世纪70年代的科学试验、80年代至90年代初期的技术实践证明了飞播技术的可行。不同时期飞播成效存在差异,1969～1979年和1980～1993年两个时间区段陕西省飞播成效面积率分别为47.3%和52.5%,1994～2000年和2001～2004年两个时间区段飞播成效分别为29.0%和33.2%,1994年飞播成效出现了台阶式的下降,幅度达到20个百分点上下。各地域在时间序列上的变化幅度有别,但趋势基本保持一致。飞播发展中不同的驱动力,在飞播成效上均得到了充分的响应,注重技术和成效是飞播未来发展的出路。

Statistics of aerial seedling in Shaanxi from 1958 to 2004 were analyzed.The result showed that the afforesation effects from aerial seeding in different periods proved the technical feasibility by aerial seeding,that there are difference among the effects different periods of aerial seeding,with the afforestation effect reaching 47.3% during 1969-1979 and effect reaching 52.5% during 1980-1993,while the afforestation effects in 1994-2000 and 2001-2004 reaching 29.0% and 33.2% respectively,with the effect declining about 20%.The driving forces for forest establishment in different periods have been displayed.