Use figures 3-5 to answer the following. 3. What relationships do water vailabil
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Use figures 3-5 to answer the following.
3. What relationships do water vailability and temperature appear to have with primary productivity? Why should they have these relationships?
4. There is a lot of variability in the relationships illustrated in Figure 5 (i.e. for any given temperature or precipitation level, there is a range of primary productivities). Why are these relationships not “tighter”?
5. Evapotranspiration measures the amount of water lost from an ecosystem due to surface evaporation and transpiration. Why do you think this measurement more accurately predicts primary production than does either precipitation or temperature? (see Figure 4).
6. Given the relationships you have just discussed, explain the patterns of primary productivity you see in Figure 7.
7. Do you think these are the only factors controlling primary productivity in terrestrial ecosystems? What other factors might limit terrestrial productivity?
Figure 3. (below left) Net primary productivity for a variety of terrestrial ecosystems as a function of (a) precipitation and (b) mean annual temperature. From: Smith, TM, and RL Smith. 2006. Elements of Ecology. 6" ed. Benjamin Cummings, San Francisco Figure 4. (below right). Relationship between aboveground net primary production and evapotranspiration for a range of terrestrial ecosystems. From: Smith, IM, and KL Smith. 2006. Elements of Ecology, 6" ed. Benjamin Cummings, San Francisco 3000 3.50 Tropical forest 2000 3.25 Hemlock-beech forest Beech-maple Pine forests 3.00 forest . Chestnut-oak heath e Pine heath Tallgrass prairie 2.75 1000 2000 3000 4000 Precipitation (mm) 2.50 3000 Alpine tundra 2.25 Arctic, tundra 2000 2.00 1000 1.75 e Creosote-bush desert -10 10 20 30 1.5 Temperature C) ,00 225 2.50 2.75 3.00 3.25 Estimated actual evapotranspiration (log1o mm/yr)Explanation / Answer
3. The precipitation have direct relation with the dry matter productivity which can be directly seen from the image. This direct relation is because the more precipitation provide water availability to the ecosystem plants and trees which increases the biomass of the system.
The temperature also have the direct co-relation. The dry productivity is supposed to increase with increase of temperature since the higher temperature will allow the dryer condition and allowing the more production of dry matter or conversion of biomass to dry matter.
Please ask the rest of the questions in separate questionnaire.
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