Germany has led the world in the fie 且 d of foreslry science since the s [ art of re 置 ated activities there in the l8th century . FuH − scaie artificial foresta 恒on with conifers also began with the progress of forestry science , and the ferestr ) i developed remarkably in the country during the lgth century . As part of this process , the concept of sustaining forests ar se from the interna ]Iogic of the fbr − estry , as demonstrated by the fact tbat a number of yield regulation moasufes were

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... contrived as techniques for R) resI maintenanee . Long disputes on the concept of sustaining forests and the setting of targets in forestry management ens 巳ed . Since the 1970s, 吐 he German forestry has had to place more focus on peoplo ' s hcightened expectations in regard to forests as well as an increased num − ber of environmental conservation campaigns and global movements じo 囗cemiDg the significance of forests . The framework of Gennanゾs concept of sustaining fores 重 s has been transformed through such changes in extemal conditions , and 血 e coun 廿 y has reached the stage of promoting near −11a 加 ral forestry . It ls now faced with new technical issues , including natural regeneration and management of mixed ferests , within lhe new t ' ramewerk set by such conditions . In the future , the Gemlan forestry is expected to progress toward the resolution of these technical issues