John, we've been providing arb advice to the management of this sports reserve for about 12 months, no overall management plan as yet hopefully in the next couple of months. This tree came up in a general walk around the place three weeks back, not picked up in the initial survey 12 months back (oops!!) Wrote them a short report very stronglt recommending removal asap.
The problems for the tree are (were) multiple and hark back to the attempted removal say 20yrs ago. I think the entire tree was stump regrowth, but the original tree self sown I'd say was growing over rocks/concrete etc, after the failed attempt to remove it and the subsequent regrowth the road and the car park were built...further damage. Ganoderma arrives and finds a tree with numerous sittes for infection large injury at base with unprotected tissues..yum, yum. So begind the struggle for control of those tissues between fungi and tree, this can go on for 10 years, or more or be over in 12 months depends on the health and vigour of the tree environmental conditions etc...
So the low cut you mention yes was envovled certainlt but I don't think the tree would ever had been a long term proposition for the sports reserve (Qld state govt owned and managed), the excessive lean was also doubtless connected to the competition for light with neighbouring trees, it only made the risk greater for users of the facilities.
Albizias are interesting in the way they produce adventitious roots in dramatic fashion from just under the bark when function is lost in the roots below..glaring tell tale sign of loss of roots to pathogenic fungal colonisation, a severe injury, even massive would produce new growth at the injury site not 300/400mm above it from under the bark of the stem.
Here's a photo of another A lebbeck doing very similar, these roots were being produced almost all the way around the circumference of the stem...tree removed.
