The tundra biome covers many hundreds of square miles, and conditions vary from place to place.
Some areas are richer in plant life than our example here, others are even more desolate.
The part of the tundra that is being described is covered with shallow pools of water and low-growing plants. It ix populated mainly by lemmings, snowy owls, and arctic foxes. The square meter that we are basing our calculations on is all above water. The tundra is a challenging environment, and the short growing season limits plant growth. The tundra produces only 600 Kilocalories per square meter per year for the herbivores to eat.