The correct option for promoting biodiversity in a managed ecosystem is
B. Implementation of controlled burns to maintain grassland habitats.
Detailed Explanation
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Understanding Biodiversity: Biodiversity refers to the variety of life in a particular habitat or ecosystem. It includes the diversity of species, genetic diversity within species, and the variety of ecosystems themselves. High biodiversity is crucial for ecosystem resilience, productivity, and stability.
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Evaluating the Options:
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A. Monoculture planting of native species:
- Why it's incorrect: Monoculture refers to the agricultural practice of growing a single crop or plant species over a wide area. While planting native species is beneficial, doing so in a monoculture format reduces biodiversity. It limits the variety of organisms that can thrive in that environment, as it does not support a diverse range of species interactions and ecological functions.
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B. Implementation of controlled burns to maintain grassland habitats:
- Why it's correct: Controlled burns, or prescribed fires, are a management tool used to maintain and restore grassland ecosystems. These burns help to clear out dead plant material, control invasive species, and promote the growth of native plants. Fire can stimulate the germination of certain seeds and create a mosaic of habitats that support various species. This practice enhances biodiversity by maintaining the ecological balance and allowing different species to thrive.
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C. Introduction of non-native species to enhance ecosystem services:
- Why it's incorrect: Introducing non-native species can lead to ecological imbalances. Non-native species can become invasive, outcompeting native species for resources, disrupting local ecosystems, and leading to a decline in biodiversity. While some non-native species may provide certain ecosystem services, the long-term effects often harm the native biodiversity and ecosystem health.
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D. Use of chemical fertilizers to increase plant growth:
- Why it's incorrect: While chemical fertilizers can enhance plant growth, they can also lead to nutrient runoff, which can cause water pollution and harm aquatic ecosystems. Over-reliance on fertilizers can degrade soil health and reduce the diversity of soil organisms. This practice does not promote biodiversity; instead, it can lead to a decline in the variety of life forms in the ecosystem.
Summary of Key Points
- Biodiversity is essential for ecosystem health and resilience.
- Controlled burns help maintain grassland habitats, promoting a diverse range of species.
- Monoculture planting reduces biodiversity by limiting species variety.
- Non-native species can disrupt local ecosystems and harm native biodiversity.
- Chemical fertilizers can lead to environmental issues and do not support biodiversity.
Revision Summary
- Controlled burns are effective for maintaining biodiversity in grasslands.
- Monoculture practices limit species diversity and ecological interactions.
- Non-native species can disrupt ecosystems and reduce native biodiversity.
- Chemical fertilizers can harm ecosystems and do not promote biodiversity.