(Figure 20.8) The figure shows that as mean annual temperature increases, net primary productivity also increases. Net primary productivity increases with mean annual precipitation until approximately 3 metres of precipitation, after which productivity declines. Why does this decline occur?

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(Figure 20.8) The figure shows that as mean annual temperature increases, net primary productivity also increases. Net primary productivity increases with mean annual precipitation until approximately 3 metres of precipitation, after which productivity declines. Why does this decline occur?