Slide 16: Effects of temperature on NEP
There is also a difference in the temperature response of grasses and trees. In both cases it is hump-shaped, but C4 plants have a higher temperature optimum. These curves have a big impact on the outcome, because mean summertime daytime temperatures in many savannas are close to the C3 optimum. If they get hotter, production of trees goes down, but production of grasses continues to rise initially, and then declines at a slower rate than trees. The function that is used to model this relationship is shown under the graph.