What Happened
- Researchers from O.P. Jindal Global University and IIT Kharagpur found that the Aravalli Mountain System lost 13.8% more soil annually between 2017 and 2024, with mean annual soil loss rising from 1.59 to 1.81 tonnes per hectare per year.
- Built-up areas in the Aravallis surged 53% over the study period, driven by rapid urbanisation that converted rangelands and croplands into impervious surfaces.
- Paradoxically, forest cover in the region increased during the same period, yet the overall soil erosion rate still climbed — demonstrating that localised afforestation cannot offset large-scale, unsustainable land conversion.
- The study, published in the journal Geographies, used moderate-resolution data for 2001–2020 trend analysis and high-resolution data from 2017 and 2024 (years with divergent meteorological conditions) for precise erosion measurement.
- Steep slopes, susceptible soils, and mining areas were identified as key erosion hotspots throughout the range.
Static Topic Bridges
Aravalli Range — Geography and Ecological Significance
The Aravalli Range is one of the world's oldest fold mountain systems, stretching over 800 km from Gujarat through Rajasthan and Haryana to Delhi. Its highest peak, Guru Shikhar on Mount Abu (Rajasthan), reaches 1,722 m. Despite its modest height, the Aravallis serve critical ecological and geographical functions.
- The Aravallis act as a natural barrier preventing the eastward expansion of the Thar Desert into the densely populated Indo-Gangetic Plain, protecting cities such as Delhi, Jaipur, and Gurugram.
- They recharge multiple river systems and aquifers in Rajasthan and Haryana, providing freshwater for agriculture and urban supply in water-scarce regions.
- Soil degradation in the Aravallis triggers aquifer damage, desert gap expansion, and worsening air quality (dust storms) in downwind urban areas.
- The range spans four states: Rajasthan, Haryana, Gujarat, and Delhi — with 6 million hectares of landscape under its influence.
- Unlike the Western Ghats, the Aravallis have no formal designation as a biodiversity hotspot, leaving them with weaker legal protection against encroachment.
Connection to this news: A 13.8% rise in annual soil loss directly threatens the Aravallis' function as a desert barrier and hydrological regulator. If soil erosion erodes the ridgeline and degrades rangelands, the Thar Desert's advance into the Gangetic Plain accelerates — with consequences for agriculture, water security, and climate resilience across four states.
Land Degradation Neutrality (LDN) and UNCCD
The United Nations Convention to Combat Desertification (UNCCD, 1994) is the only legally binding international agreement on land and soil. India has ratified the UNCCD. Land Degradation Neutrality (LDN) is its central operational concept: the state where the amount and quality of land resources necessary to support ecosystem functions remain stable or increase over time.
- LDN was formally adopted by UNCCD Parties in 2015 (COP12) and is embedded in SDG Target 15.3: "By 2030, combat desertification, restore degraded land and soil."
- India committed to LDN by upgrading its land restoration target to 26 million hectares by 2030, from an earlier commitment of 21 million hectares.
- UNCCD operates on the "avoid, reduce, reverse" hierarchy — LDN does not permit net degradation to be offset by restoration elsewhere without first exhausting prevention options.
- India showcased the Aravalli Green Wall Project at UNCCD COP-16 (Riyadh, 2024) as a flagship LDN initiative.
- India accounts for approximately 30% of the world's dryland area; land degradation affects 29.7% of India's total geographic area.
Connection to this news: The Aravallis study directly challenges India's LDN narrative — built-up area expansion is overwhelming afforestation gains, meaning the "restore" pillar of LDN is being undermined by the failure of the "avoid" pillar. Net land quality is declining despite headline forest cover increases, exposing the limitation of afforestation-only conservation strategies.
Aravalli Green Wall Project (AGWP)
Inspired by Africa's Great Green Wall initiative, India launched the Aravalli Green Wall Project (AGWP) in 2023 to create a 1,400 km long and 5 km wide green buffer around the Aravalli range.
- Objectives: Combat land degradation, prevent desertification, conserve biodiversity, and create livelihood opportunities.
- Coverage: Haryana, Rajasthan, Gujarat, and Delhi — 6 million hectares.
- Target: Restore 1.15 million hectares of degraded land by 2027 by planting native trees and shrubs on scrubland, wasteland, and degraded forest land.
- The project also includes rejuvenating surface water bodies (ponds, lakes, streams) as part of an integrated watershed management approach.
- It represents India's commitment under the Bonn Challenge (2011) — a global effort to restore 350 million hectares of deforested and degraded land by 2030.
Connection to this news: The AGWP is the flagship policy response to exactly the kind of degradation this study documents. However, the finding that afforestation is being "swamped out" by 53% built-up area growth raises fundamental questions about whether AGWP's restoration targets can be achieved without strict land-use regulation and curbing urban encroachment on the range.
Soil Erosion — Causes, Measurement, and the Universal Soil Loss Equation (USLE)
Soil erosion is the process by which soil is detached and transported by water, wind, or tillage. It is a primary driver of land degradation, reducing soil fertility, increasing sedimentation in water bodies, and accelerating desertification.
- The Universal Soil Loss Equation (USLE) and its Revised version (RUSLE) are standard tools for estimating annual average soil loss, factoring in rainfall erosivity, soil erodibility, slope length, cover management, and support practices.
- Soil loss under 1–5 t/ha/yr is generally considered tolerable in many arid/semi-arid systems; values above this signal accelerating degradation.
- Key drivers in the Aravallis: impervious surface expansion (removes vegetative cover and increases runoff velocity), mining activity (destabilises slopes and removes topsoil), and intense rainfall events (amplified by climate change).
- Soil formation rates are extremely slow — approximately 1 cm per 200–1,000 years under natural conditions — making degraded topsoil essentially non-renewable on human timescales.
- National initiatives addressing soil conservation: Pradhan Mantri Krishi Sinchayee Yojana (PMKSY) includes watershed development components; National Watershed Development Project for Rainfed Areas (NWDPRA); Integrated Watershed Management Programme (IWMP).
Connection to this news: The rise from 1.59 to 1.81 t/ha/yr in the Aravallis crosses from a marginal to a concerning erosion rate, especially given the range's ecologically critical role. The study's methodology (RUSLE with high-resolution data for divergent meteorological years) is an example of geospatial analysis techniques increasingly used in Indian environmental research — relevant for GS-3 and mains analytical questions.
Key Facts & Data
- Aravalli annual soil loss increased from 1.59 to 1.81 t/ha/yr between 2017 and 2024 — a 13.8% rise.
- Built-up area in the Aravallis grew by 53% over the study period.
- Study conducted by researchers from O.P. Jindal Global University and IIT Kharagpur, published in the journal Geographies.
- Aravalli Range: ~800 km long, highest peak Guru Shikhar (1,722 m), spans Gujarat, Rajasthan, Haryana, and Delhi.
- Aravalli Green Wall Project (AGWP): 1,400 km × 5 km buffer zone, targeting 1.15 million hectares restoration by 2027 across 4 states.
- India's LDN target: Restore 26 million hectares of degraded land by 2030.
- India presented AGWP at UNCCD COP-16 (Riyadh, 2024).
- India: ~30% of total land area classified as dryland; 29.7% of geographic area affected by land degradation.
- SDG Target 15.3: Achieve land degradation neutrality by 2030.
- UNCCD adopted in 1994; LDN concept formalised at COP12 in 2015.