Biodiversity Parks: Urban Oases for Conservation and Education

Cities across the world are expanding rapidly, often at the expense of natural habitats. Amid growing concerns about species loss, pollution, and climate change, a unique concept has emerged – biodiversity parks. These are purpose-built green spaces within urban areas that go far beyond traditional parks. They focus on restoring degraded land, conserving native species, and delivering critical ecosystem services to surrounding communities. Delhi, India’s capital, stands out as a global leader in this space, with seven biodiversity parks spanning approximately 820 hectares of previously degraded land now teeming with life.

What are biodiversity parks? 🔗

A biodiversity park is a scientifically designed urban green space that aims to recreate and sustain native ecosystems. Unlike ornamental gardens or recreational parks that may rely on non-native plants for aesthetic appeal, biodiversity parks prioritise the restoration of indigenous flora and fauna. The goal is to develop a mosaic of habitats – forests, wetlands, grasslands – that function as dynamic ecosystems with natural processes such as pollination, decomposition, nutrient cycling, and water filtration taking place organically.

These parks are typically developed on degraded or abandoned land, including former mining sites, barren floodplains, and polluted water bodies. Restoration specialists study historical vegetation patterns, soil conditions, and local wildlife before reintroducing native species in a phased manner. The result is a self-sustaining ecological system that provides tangible benefits to the city it inhabits.

Role and purpose of biodiversity parks 🔗

Biodiversity parks serve several interconnected roles within urban settings. At their core, they are conservation tools designed to protect and revive species that have been displaced by urbanisation. But they also function as climate resilience infrastructure, outdoor classrooms, and spaces that improve the quality of life for city dwellers.

Restoring ecosystems on degraded land 🔗

One of the most significant contributions of biodiversity parks is their ability to convert wastelands into functional ecosystems. In Delhi, the Delhi Development Authority (DDA) partnered with the Centre for Environmental Management of Degraded Ecosystems (CEMDE) at the University of Delhi to restore land that had been ravaged by mining, invasive species, and pollution. Abandoned quarries have been turned into conservatories, barren floodplains into wetlands, and sewage-dumping sites into thriving lakes.

This restoration work follows a science-driven approach. Native grasses are planted first to improve soil quality and reduce salinity. Once the soil is stabilised, native trees, shrubs, and climbers are introduced in carefully planned communities that mimic natural forest layers – canopy, mid-storey, and ground cover. Over time, birds, insects, reptiles, and mammals begin to colonise these restored habitats.

Conserving native species 🔗

Biodiversity parks act as refuges for native species that would otherwise disappear from urban landscapes. They maintain ecological connectivity in fragmented city environments, allowing species to find food, shelter, and breeding grounds. By focusing on native plants rather than exotic ornamentals, these parks support local pollinators, seed dispersers, and predators – all essential components of a healthy food web.

Building urban climate resilience 🔗

Experts increasingly view biodiversity parks as essential green infrastructure for cities facing the impacts of climate change. They serve as carbon sinks, absorbing CO₂ from the atmosphere. Their dense vegetation helps mitigate the urban heat island effect, where city centres are significantly warmer than surrounding rural areas. Additionally, wetland areas within these parks absorb excess rainwater during monsoons, reducing urban flood risks. As one New Delhi-based landscape architect noted to Mongabay, biodiversity parks must be treated through the lens of climate resilience rather than mere beautification.

Ecological and educational benefits 🔗

The benefits of biodiversity parks extend well beyond their boundaries. They deliver what ecologists call ecosystem services – the free benefits that humans receive from well-functioning natural systems. At the same time, they serve as powerful platforms for environmental education.

Air quality improvement 🔗

Urban vegetation plays a direct role in cleaning the air. Trees and dense plant cover in biodiversity parks absorb carbon dioxide, release oxygen, and trap particulate matter and pollutants. In a city like Delhi, which faces severe air quality challenges, particularly during winter, these parks provide measurable improvements to the air quality of surrounding neighbourhoods. Research confirms that urban biodiversity can significantly improve air quality and reduce heat island effects.

Water purification and groundwater recharge 🔗

Several biodiversity parks incorporate wetland ecosystems that naturally filter stormwater runoff and even treat wastewater. Constructed wetlands use natural processes – aeration, aquatic plants, and microbial activity – to remove pollutants from water without any machinery or electricity. This purified water can then recharge underground aquifers, addressing another major urban challenge: declining groundwater levels. The vegetation also prevents soil erosion and reduces the volume and speed of runoff, protecting the city from flash floods.

Environmental education centres 🔗

Biodiversity parks double as outdoor classrooms where students, researchers, and general visitors can observe ecological processes firsthand. Rather than learning about food webs, pollination, and habitat restoration from textbooks alone, students can see these processes in action. Guided nature walks, bird-watching sessions, camping programmes, and hands-on seed-collection drives are commonly offered. University researchers also use these parks as field sites for studying urban ecology, soil science, hydrology, and conservation biology. The educational mission of biodiversity parks is critical for building environmental awareness in the younger generation.

Delhi’s biodiversity parks: a closer look 🔗

Delhi is perhaps the best example of a city that has systematically invested in biodiversity parks. The city now has seven biodiversity parks spread across its two major landforms – the Yamuna river floodplain and the Aravalli hill ridge. Together, these parks support hundreds of native plant species, over 300 bird species, and a range of mammals, reptiles, and amphibians. Let’s look at the two most prominent ones.

Yamuna Biodiversity Park 🔗

Spread across 457 acres along the Yamuna riverfront, the Yamuna Biodiversity Park (YBP) is one of Delhi’s most successful ecological restoration stories. The park was developed by the DDA in collaboration with scientists from Delhi University, beginning in 2002. The land was originally barren floodplain with highly alkaline, nutrient-poor soil that made plant growth extremely difficult.

Restoration began with the planting of specific grass species to neutralise the soil’s pH, which was as high as 10 – far too alkaline for most native plants. Over time, researchers brought the pH down to neutral levels, enabling the reintroduction of native trees such as sal, teak, and hardwickia. The park was developed in two phases: Phase I (beginning 2005) focused on restoring the inactive floodplain, while Phase II (beginning 2015) addressed the active floodplains.

The transformation has been remarkable. Before restoration, the area supported only mongooses, lizards, and about 31 bird species. By 2019, the park hosted approximately 1,500 species of plants and animals, including 200 bird species. The park’s wetlands now attract thousands of migratory birds from Siberia, Central Asia, and Europe each winter. Species like the Red-crested Pochard and the endangered Ferruginous Pochard are regular winter visitors. In 2016, the shy hog deer was documented in the park through camera traps – a species once thought to have disappeared from the capital entirely.

YBP also plays a vital role in conserving wild genetic resources of agricultural crops and enhancing freshwater availability by recharging groundwater through its wetland systems.

Aravalli Biodiversity Park 🔗

Located on the South Central Ridge of Delhi, the Aravalli Biodiversity Park (ABP) covers approximately 280 hectares of land that was once a degraded wasteland scarred by decades of mining. The terrain consists of slopes, flat hilltops, spoil heaps from mining operations, and deep quarry pits. The invasive Prosopis juliflora (vilayati kikar), introduced during the colonial era, had taken over the entire landscape, displacing native vegetation and depleting groundwater.

Under the leadership of ecologist M. Shah Hussain, the DDA and University of Delhi began restoring this land in 2004. The invasive species were removed and replaced with native Aravalli flora in a systematic, research-driven manner. Today, ABP harbours around 300 species of native plants, including 200 rare and endangered species of the northern Aravalli range. The park supports 182 bird species, along with mammals like nilgai, jackals, palm civets, and porcupines.

Some of the most creative restoration work is visible in the former mining pits. Three deep quarry pits have been converted into conservatories for butterflies, ferns, and orchids – the orchid conservatory being the only one of its kind in Delhi. The cool, damp microclimate inside these pits provides ideal growing conditions for orchids. The park is also the only known roosting site in Delhi for Blyth’s horseshoe bat, a rare species.

ABP is a major centre for nature education. It offers camping facilities for school children – the only park in Delhi to do so – along with nature trails, guided walks, and interactive programmes designed around the philosophy of learning by doing. Hundreds of visitors, particularly young people, come to the park daily.

Other notable parks in Delhi 🔗

Beyond the Yamuna and Aravalli parks, several other biodiversity parks contribute to Delhi’s ecological health. Neela Hauz Biodiversity Park, though much smaller at just 3.88 hectares, is a restored wetland ecosystem. The lake, which had become a dumping ground for untreated sewage, was revived using a constructed wetland system that treats wastewater using only natural processes. The park now supports over 70 bird species and serves as a sponge that absorbs excess water, slowly releasing it and helping prevent urban flooding.

Other parks include the Tilpath Valley Biodiversity Park (70 ha), Tughlaqabad Biodiversity Park (81 ha), Northern Ridge Biodiversity Park (87 ha), and the South Delhi Biodiversity Park (113.3 ha). Each park has been tailored to its specific landform and ecological context, whether that is the rocky terrain of the Aravalli range or the floodplain of the Yamuna.

A model for other cities 🔗

The success of Delhi’s biodiversity parks has had a ripple effect beyond the city. Based on the outcomes of these parks, India’s Ministry of Environment, Forest and Climate Change has launched a scheme to establish biodiversity parks across states and union territories throughout the country. This recognises biodiversity parks not as luxury additions to urban planning, but as essential infrastructure for building ecologically resilient cities.

Globally, the concept aligns with the growing emphasis on urban green infrastructure – networks of green spaces that support biodiversity, manage stormwater, regulate temperature, and improve quality of life. The EU Biodiversity Strategy for 2030, for instance, has set specific targets for enhancing urban biodiversity and restoring green and blue infrastructure in cities.

For any city looking to improve its environmental health, Delhi’s biodiversity parks offer a clear, replicable model: identify degraded land, apply scientific restoration techniques focused on native species, integrate education and public access, and allow ecological processes the time and space to recover.

Challenges and the road ahead 🔗

Despite their success, biodiversity parks face ongoing challenges. Urban expansion continues to exert pressure on green spaces. Maintaining restored ecosystems requires sustained scientific oversight and funding. Encroachment, pollution from surrounding areas, and the constant threat of invasive species demand long-term vigilance.

Experts argue that cities need to expand their green commons significantly. Delhi’s green cover, at roughly 19%, is less than half of what many other capital cities around the world have achieved. Biodiversity parks need to be connected through ecological corridors to prevent habitat fragmentation and allow species to move freely across the urban landscape. Urban planners must view these parks not as standalone projects but as interconnected nodes in a city-wide ecological network.

What do you think? Can biodiversity parks effectively balance the needs of urban development with the urgent need for ecological conservation? How might the biodiversity park model be adapted for the city or region where you live?

References

1. https://india.mongabay.com/2025/03/new-delhi-invests-in-natural-capital-through-biodiversity-parks/
2. https://dda.gov.in/biodiversity-parks
3. https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2024.1440477/full
4. https://news.mongabay.com/short-article/2025/03/new-delhi-transforms-degraded-lands-into-biodiversity-parks/
5. https://iucn.org/story/202305/embracing-biodiversity-paving-way-nature-inclusive-cities
6. https://en.wikipedia.org/wiki/Yamuna_biodiversity_park
7. https://www.delhibiodiversityparks.org/aravalli-biodiversity-park.html
8. https://ioraecological.com/rooted-in-ruins-delhis-biodiversity-legacy/