Local Land Services Director of Regional Operations Rob Kelly said those disobeying the law could cop a hefty fine.

"While it is lovely to enjoy a roaring fire when the mercury drops, do not get burnt by a hefty fine for taking wood illegally," he said.

Anyone caught removing timber or disturbing vegetation from a TSR can be fined up to $5500 under the Local Land Services Act 2013.

TSRs are an essential refuge for many rare and endangered native plants, and fallen logs and standing dead wood can be part of their habitat.

Decaying timber and leaf litter are also important in the process of nutrient recycling back into the soil.

"We need to make sure there is a clear understanding in the community about the importance of TSRs and their long term viability," Mr Kelly said.

Members of the public are asked to report any illegal activity to Local Land Services on 1300 795 299, or to contact NSW Police on 131 444.

While firewood collection is not permitted on TSRs, members of the public can apply for a permit to collect firewood from selected state forests.