Chapter 24: Problem 7

How does seasonality influence rates of net primary productivity and decomposition in savanna ecosystems?

Short Answer

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Answer: Seasonality plays a significant role in shaping the net primary productivity (NPP) and decomposition rates in savanna ecosystems. During the wet season, increased rainfall supports plant growth and photosynthesis, leading to higher NPP, as well as favorable conditions for decomposers, resulting in increased decomposition rates. Conversely, during the dry season, water stress on plants and less favorable conditions for decomposers cause a decline in both NPP and decomposition rates.

Step by step solution

Define net primary productivity and decomposition

Net primary productivity (NPP) refers to the rate at which plants produce organic compounds (biomass) through the process of photosynthesis, minus the rate of respiration, that is, energy consumed by plants themselves. Decomposition, on the other hand, is the process by which organic matter in dead plants and animals is broken down by microorganisms into simpler compounds that can be used by plants in the ecosystem.

Describe the savanna ecosystem

The savanna ecosystem is typically characterized by a mix of grasses and trees, with a climate that is warm with distinct wet and dry seasons. The amount of rainfall is one of the main factors influencing the vegetation of savannas, shaping both the NPP and decomposition rates.

Discuss the influence of seasonality on NPP in savanna ecosystems

Seasonality in the form of wet and dry seasons influences the rate of net primary productivity in savanna ecosystems. During the wet season, there is an increase in rainfall, which provides more water for plant growth and photosynthesis, increasing NPP. In contrast, the dry season is characterized by a lack of rainfall and higher temperatures, which can lead to water stress on plants and a reduction in photosynthesis, ultimately reducing NPP.

Discuss the influence of seasonality on decomposition in savanna ecosystems

Seasonality also affects decomposition rates in savanna ecosystems. During the wet season, high temperatures and moisture levels facilitate the activity of decomposer microorganisms, leading to an increased rate of decomposition. In the dry season, however, low moisture levels and high temperatures can lead to decreased activity of decomposers, thereby reducing decomposition rates.

Summarize the impact of seasonality on net primary productivity and decomposition in savanna ecosystems

In conclusion, seasonality has a significant impact on the rates of net primary productivity and decomposition in savanna ecosystems. The wet season fosters higher NPP and decomposition rates due to increased water availability and favorable conditions for both plant growth and decomposer activity. In contrast, the dry season leads to decreased NPP and decomposition rates as a result of water stress on plants and less favorable conditions for decomposer microorganisms.

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How does seasonality influence rates of net primary productivity and decomposition in savanna ecosystems?

Short Answer

Step by step solution

Define net primary productivity and decomposition

Describe the savanna ecosystem

Discuss the influence of seasonality on NPP in savanna ecosystems

Discuss the influence of seasonality on decomposition in savanna ecosystems

Summarize the impact of seasonality on net primary productivity and decomposition in savanna ecosystems

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