Flora Singapura





Tree Falls
The Central Catchment Nature Reserve consists of many fragmented sections of forest growing on peninsulars that extend into the water storage reservoirs making them vulnerable to strong gusts of wind generated during storm events. Almost every year some section of the forest is blown over due to strong wind gusts generated by Sumatran Squals or other more localized weather events. 
The most recent tree fall occurred on 11 Feb 2011 in the vicinity of Mandai Rd (picture above). This particular tree fall attracted much public attention as it was the first to occur in a location that could be seen by the general public and was subsequently reported on in the local news papers.

Estimated extent of the 11 Feb 2011 Tree Fall at Mandai Rd
In this case some 40 hectares of mature secondary forest was literally flattened by a local storm which passed over the Upper Seletar Reservoir. Much of the forest damage seems to have occurred around the water inlets and it seems likely that winds passing unrestricted over the reservoir surface were funneled into these inlets and accelerated as the inlets narrowed.
Similar patterns of wind damaged forest concentrated about reservoir inlets were observed after a line of Sumatran Squals  passed over Singapore in early  September 2010. This tree fall was less extensive and occurred in secondary forest adjoining the Upper Peirce Reservoir in the vicinity of Chestnut Avenue.
It is expected surviving saplings, dormant seed stock and opportunistic pioneer species will soon naturally regenerate these tree-fall areas.
Previously mature secondary forest is now daylight.

Trees are snapped and twisted  by the winds.

This Rhodamnia cinerea was snapped and split.
This mature Litsea was uprooted.
This Alstonia pneumatophora survived due to its root system.
This Cyathocalyx ridleyi survived due to its flexibility