Energy source: 1,254,000 kcal/m2/year 0.8% energy captured by photosynthesis Of
ID: 257376 • Letter: E
Question
Energy source: 1,254,000 kcal/m2/year 0.8% energy captured by photosynthesis Of this. 55% is lost to 4% supports growth (Net primary production) maintenance activities or as heat 11 % enters consumer food web 34% enters decomposer food web as dead material FIGURE 54.11 Energy Flow through the Hubbard Brook Forest Ecosystem Energy from sunlight is transformed to chemical energy by photosynthesis. Photosynthetic products fuel new plant growth, which eventually enters either the consumer or decomposer food web. EXERCISE Calculate gross photosynthetic efficiency and NPP in kcal/m2/year. Calculate the amount of energy that enters the consumer and decomposer food webs each year, in kcal/m2Explanation / Answer
Gross primary productivity = 0.8 X 1254000 = 1003200 kcal/m2/year
Net primary productivity = 0.45 X 1003200 = 451440 kcal/m2/year
Energy lost to heat and respiration = 0.55 X 1003200 = 551760 kcal/m2/year
Energy that enters consumer food web = 0.11 X 1003200 = 110352 kcal/m2/year
Energy that enters decomposer food web = 0.34 X 1003200 = 341088 kcal/m2/year
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