Abiotic Factors
The climate of the Taiga is cold, but it has bitterly colder winters, and they last a long time; the snow that falls during the winter is heavy, and due to the freezing temperatures, there is a layer of permafrost in the soil. The summer is short and cool but it's hotter that winter, causing moisture to the soil and freezing up again in the winter. The annual varying temperatures go from both extremes of cold and hot. The plants need to be able to sustain sunlight well enough to survive because the sun can be hidden behind clouds and snow. The air is cold and so is the water.
Limiting Factors
There are 2 types of limiting factors, and their names are Density Dependent and Density Independent. Density dependent examples are light and saplings, these require space to be able to operate and survive, or help other species. Density Independent examples are temperature and volcanic eruption, these don't require space and will make things difficult for both plants and animals, especially the volcanic eruption because it is an imbalance to the usually cold temperatures, as well as the fact that the lava would harm the environment in the immediate area.