Non-agroforestry Nitrogen fixing Species and Their Important Role in Soil Conservation
The soil, a dynamic and living
resource, is critical to global biogeochemical cycling, ecosystem health, and
long-term food production. However, many agriculture soils have been badly
eroded in recent years. Although deforestation, urbanization, and productive
annual row cropping practices damage surface and ground waters, degrade soils,
increase greenhouse gas emissions, and increase biodiversity loss, Whereas the
researchers are striving to save soil using their best tactics and
methodologies, In this article, we look at various non-agroforestry plant
species that help with nitrogen fixation and soil conservation in India.
several people in the globe rely
on trees for several uses, such as food, fodder, fuelwood, and goods such as
gum, honey, and pharmaceuticals. In India, several tree species are known for
their nitrogen-fixing abilities, contributing to soil fertility, conservation and ecosystem
health. Here's a list of nitrogen-fixing trees commonly found in India:
Table.1: Nitrogen Fixing trees and their roles in Soil conservation
| Scientific Name | Roles/Uses |
|---|---|
| Vachellia nilotica (L.) PJHHurter & Mabb. | Used as pioneer species in land rehabilitation and as a barrier to desertification. |
| Albizia lebbeck (L.) Benth. | The extensive, shallow root system makes it a good soil binder and suited to soil conservation and erosion control; recommended for eroded lands and erosion control. Foliage can tolerate a moderate degree of salt spray making A. lebbeck useful for stabilising susceptible land in coastal areas; also used in rehabilitating degraded land by virtue of nitrogen fixation and nutrient cycling with leaf drop. |
| Casuarina equisetifolia L. | The fast rate of growth, ability to fix atmospheric nitrogen, and ability to grow in disturbed and poor soils, it is an excellent plant for use in soil stabilisation projects. Since it is salt-tolerant and succeeds in sand, it is particularly suited for controlling erosion along coastlines, estuaries, riverbanks, and waterways. |
| Sesbania grandiflora (L.) Poir. | It is ideal for rehabilitating eroded hills and has excellent root nodulation, allowing it to fix nitrogen, although this ability may be limited. Fruits, falling leaflets, and flowers make excellent green manure or mulch, as well as improving soil fertility. This annual is well-suited for dense planting, short-term growth, and soil improvement prior to planting food crops. |
| Neltuma juliflora (Sw.) Raf. | It has been used in coastal areas to arrest wind erosion and stabilise sand dunes. It moderately enriches the soil with atmospheric nitrogen obtained through symbiosis with cowpea-type Rhizobium. |
| Leucaena leucocephala(Lam.) de Wit | It serves as a windbreak; it fixes nitrogen in the soil to conserve it. |
Conclusion:
These trees play a vital role in afforestation,
and enhancing soil fertility through their ability to fix atmospheric nitrogen
with the help of symbiotic bacteria in their root nodules. They are valuable
assets for sustainable agriculture, afforestation projects, and ecological
restoration initiatives across India.