Ecological Restoration of Degraded Land in Maharashtra
Ketaki Ghate, Ecology Expert & Manasi Karandikar, Trustee and core faculty at Ecological Society, Pune
The 24-acre piece of land we have been working on since 2006, is owned by actors Atul Kulkarni, Dhiresh Joshi and their families. They bought this land to conserve nature and spend time away from cities. They approached ‘oikos: for ecological services’, our ecological enterprise, to executing the restoration work. We had worked on more than 150 land parcels since 2002 and suggested conservation through restoration.
Five-layer process: First, ecological assessment of the entire watershed of Wan-Kuswade village was done. The stream network, geology, forests and sacred groves (Devrai), biodiversity distribution within the catchment was studied to understand the natural set up of the surrounding area and its relation with the project land.
Seasonal assessments were done to document the entire array of biodiversity thriving in the landscape. This area should support semi-evergreen forests but what you see within the watershed is fragmented patches of forests scattered within the vast open areas with grasses and shrubby clusters.
A detailed assessment of the project land was done to understand existing status of soil, habitats and distribution of floral and faunal species. Part of the land is flat and some have a gradual slope. The flat part hosted grasses with very few shrubs and a single Anjani (Memecylon umbellatum) tree. On the slope, however, there were many shrubby clusters with sparsely standing trees.
This baseline study was completed in a year. Then, the direction and purpose of the work of restoration was decided. The objective was set to improve the texture and strength of the soil, to increase its moisture retention capacity, so that the biodiversity would increase and grow naturally. This process is also known as assisted natural regeneration.
Specific Restoration Techniques
Protection is extremely important in any restoration project to prevent and stop external pressures like a) grazing by cattle b) fire set deliberately by locals and c) cutting of trees by locals. This protection was assured by erecting a dry thorn fence along the boundaries. A live hedge was also created by planting local shrubs like Nirgudi (Vitex negundo), Karvi (Carvia callosa) and selected trees (Ficus species).
In addition, a ‘fire line’ is created every year to prevent fires from entering the project land, wherein a 10-feet wide belt is burnt deliberately and carefully to cut off continuity.
For soil and water conservation, various physical structures were constructed like stone lines, stone bunds and ponds. These were done using locally available stones. The use of cement or any external materials was completely avoided to keep the carbon and ecological footprint of the project to the minimum.
Specific erosional features were identified and repaired as needed. In certain places, habitats were created by arranging stones in a specific manner, piling up leaves and by planting host plants and food plants for birds and butterflies.
Local grasses were given special importance by offering complete protection to them. Plantation of suitable native plants is being done every year, though the aim of the project is not plantation or quick afforestation.
Native plants are selected carefully as per the site-specific soil and moisture conditions. Initially hardy species were planted and then more common and rare, endemic species were added. Seed dispersal is also done every year at suitable places.
The biomass on the ground started increasing and continues to increase every year. This has changed the physical structure of land. This biomass is serving as a natural insulating layer over the soil, which has improved its temperature, moisture, fertility, germination capacity and biodiversity.
Soil erosion is reduced as soil is arrested behind the stone bunds and stone lines. By preventing erosion on a large scale, rainwater seepage has increased. Soil texture has improved as a lot of organic matter started going into topsoil, which was food for earthworms. In turn, they created a lot of aeration in the soil, making way for other invertebrates.
Another striking difference was observed in better soil temperatures. Initially, the open soil would get heated up to 56 degrees with a layer of grass biomass, it has come down to 40°C. The land, which used to dry soon after the rains, now retains moisture for a long time, till April-May. This is most important for many microbes which now thrive even after monsoon.
The land which was earlier covered only with ‘seasonal grasses’, now has a layer of ‘perennial grasses and shrubbery’. Saplings need no watering till March-April. In earlier years, we would start watering the saplings immediately after monsoon. But now saplings survive on soil moisture till summer.
Seeds of many native plants have started germinating At the same time, the number and size of shrubs has increased because of the ban on cutting. As a result, the vegetation cover on the ground increased significantly, and so did the diversity.
A beautiful mosaic of habitats with grassy patches, shrub clusters and perennial vegetation can be seen today on the land which had been dry and open for years. Flowering and fruiting of diverse native plants provide food and shelter for many micro-organisms.
Birds started to nest and breed, indicating creation of safe sites and enough food for them. Increased numbers of lizards are indicating a higher insect population. Flora and micro fauna is the base of the food chain. Appearance of birds of prey also indicates the establishment of a complete food chain.
Occurrence of rare organisms such as sicilians, leeches using the land indicates restoration of specific habitats for them, which were completely absent in initial years. This project land has climbed up two stages on the ladder of ecological succession: A process of going towards maturity of ecosystem and the correct path of forest formation. While it is difficult to say how long it will take to reach the goal, a wait of 20-50 years seems natural.
First Published at www.downtoearth.org.in