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Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area - AQA - A-Level Geography - Question 1 - 2019 - Paper 1
Question 1
Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area. Figures 2a and 2b are in t... show full transcript
Worked Solution & Example Answer:Using Figure 2a, Figure 2b and your own knowledge, assess the potential impact of changing vegetation cover upon the runoff in this area - AQA - A-Level Geography - Question 1 - 2019 - Paper 1
Step 1
Assess the impact of changing vegetation cover in the water cycle
Answer
The water cycle is influenced by various factors, including vegetation cover. The loss of vegetation in the Taguibo Watershed from 1976 to 2001 suggests a reduction in interception and increased surface runoff. In areas where forest cover has decreased, the likelihood of soil erosion and runoff volume generally increases due to less infiltration into the soil.
Step 2
Evaluate the potential implications on runoff volume based on Figure 2b
Answer
According to Figure 2b, the runoff volume for the year 2007 shows significant variations across different zones. Areas that have undergone deforestation, particularly those previously covered by forest in 1976, demonstrate higher runoff volumes compared to rehabilitated zones. This indicates that without proper vegetation, particularly in zones that were heavily deforested, runoff is likely to be exacerbated, leading to potential flooding and water resource challenges.
Step 3
Discuss the relationship between vegetation cover and environmental impact
Answer
Vegetation cover plays a critical role in regulating runoff and protecting the landscape. The absence of adequate vegetation can lead to severe environmental consequences such as soil erosion, reduced water quality due to sedimentation, and diminished biodiversity. The assessment in Figure 2a also shows that rehabilitating the area with natural vegetation can mitigate these impacts, as it enhances the soil’s ability to absorb water, reducing overall runoff volumes and promoting ecological balance.