Taiwan logging is all small scale and highly fragmented. So the sustainable aspects to.Taiwanese.lumber is that you never see large scale clarifying like.you do in Canada/USA. By those standards, the sizes here would be considered private homeowner sized plots, usually 1 to 20 hectares. Government requires replanting, which is good, but the depth at which they think about it is purely just what species and how many plugs per fen. Little if any thought about long term effects such as erosion.
The gov here cares a LOT about digging in any mountain area. Unfortunately local governments.care more about themselves, so there is still lots of illegal logging and rock extraction.
Biggest problems are in areas with steep mountains, erosion is a massive problem and the gov does relatively little to avoid it, despite the fact once the mountain falls, that area is 9 times out of 10 now unusable in any practical way.
So sustainable wood in Taiwan I personally view as more of species.selection and area selection. Lots of.plantation wood about even.in the flat lands, especially mahogany. So in that regard its pretty sustainable far more than.a.non tree type farm which tends to.degrade the land badly.
Some species grow.super fast here and are used in in rotating crops. Southern Taiwan for example now had a roughly 3% annual cut rate of a species that takes 30 to 40 years to grow to decent size, so its tight, but fairly well understood industry. Others like.mahogany realistically take 50 to.70 years here, teak similar. So those trees are often smaller here.
Probably the biggest cons of taiwan moumountai work is that they tend to cut all the trees, even if they don’t want them. Makes.work more.co lenient, so that’s o e small but very important thing we are bosses and by proxy, customers, can co trip. Second is road building, which is a huge cause of landslides here. In many countries it requires educated folk to actually go up and check and come back with a plan, there is not.patience or.money here for that.
If you are looking at the cedar/cypress group, I would suggest looking into Japanese imports and/or north American non-old growth wood. Its more sustainable better quality and easier to work (better management practices make straighter, clear boards).