Environment & Ecology22 Concepts & Facts

What Was the Dryland Congress 2026: Dryland Ecology & Desertification

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The Dryland Congress 2026 gathered leading international agronomists, climatologists, ecologists, and rural development policymakers to address the intensifying challenges of land degradation, water scarcity, and food insecurity across the world's arid and semi-arid zones. In physical geography and environmental science, drylands are defined by the United Nations Environment Programme (UNEP) and the United Nations Convention to Combat Desertification (UNCCD) using the Aridity Index—a mathematical ratio of mean annual precipitation (P) to potential evapotranspiration (PET). Regions possessing an Aridity Index of less than 0.65 are classified as drylands, spanning hyper-arid deserts, arid zones, semi-arid savannahs, and dry sub-humid agricultural landscapes.

Drylands hold profound ecological, social, and economic significance on a planetary scale. Encompassing approximately 41 percent of the Earth's total terrestrial landmass, drylands sustain over two billion people, the vast majority of whom reside in developing nations across Sub-Saharan Africa, Central Asia, and South Asia. Additionally, drylands harbor roughly 44 percent of all globally cultivated croplands and support over 50 percent of the world's livestock populations through traditional pastoralism. Despite their low annual precipitation, dryland ecosystems host specialized endemic biodiversity, including wild ancestors of foundational cereal grains and drought-tolerant legumes. However, excessive ground water exploitation, unsustainable monocultures, and escalating global heating have accelerated desertification—the systematic degradation of fertile dryland soils into barren scrubland.

The policy roadmap advanced by the Dryland Congress 2026 centers on scaling sustainable land management (SLM) and achieving Land Degradation Neutrality (LDN), an explicit target enshrined within United Nations Sustainable Development Goal 15 (Life on Land). A primary strategic pillar is the revitalization of indigenous "orphan crops" and nutri-cereals championed by institutions like the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), headquartered in Patancheru, Telangana, India. Drought-hardy crops such as pearl millet (bajra), sorghum (jowar), finger millet (ragi), chickpea, and pigeonpea thrive under erratic rainfed conditions while requiring minimal irrigation inputs. Supported by traditional localized rainwater harvesting techniques—such as Rajasthan’s johads, tankas, and khadins—dryland stewardship safeguards rural livelihoods and bolsters global food security in an era of climate disruption.

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The Dryland Congress 2026 convened global experts to advance climate resilience and land restoration across arid ecosystems.

Drylands are defined scientifically by an Aridity Index (P/PET) of less than 0.65, denoting severe atmospheric water deficits.

The United Nations classifies drylands into four sub-categories: hyper-arid, arid, semi-arid, and dry sub-humid zones.

Drylands cover roughly 41 percent of the Earth’s total land surface area across six continents.

More than 2 billion people—nearly one-third of the global human population—reside within dryland regions.

Approximately 44 percent of the world’s cultivated agricultural land and 50 percent of global livestock reside in drylands.

Desertification refers to land degradation in arid, semi-arid, and dry sub-humid areas resulting from climatic variations and human activities.

The United Nations Convention to Combat Desertification (UNCCD), established in 1994, is the sole legally binding environmental treaty on drylands.

Sustainable Development Goal 15.3 establishes a target to achieve Land Degradation Neutrality (LDN) globally by 2030.

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India hosted the 14th Conference of Parties (COP14) to the UNCCD in New Delhi in 2019, committing to restore 26 million hectares of degraded land.

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The International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) in Hyderabad conducts premier agricultural research on dryland crops.

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Millets (pearl millet, sorghum, finger millet) are classified as nutri-cereals, requiring up to 70 percent less water than rice or wheat.

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Dryland soils are characterized by acute deficiencies in soil organic carbon and nitrogen, alongside high susceptibility to wind erosion.

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Agro-pastoralism is a primary economic livelihood in drylands, combining rainfed subsistence cropping with migratory livestock grazing.

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Traditional Indian rainwater harvesting structures in drylands include tankas (underground cisterns), johads (check dams), and khadins.

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Salinization occurs in irrigated drylands when intense surface evaporation draws dissolved mineral salts upward into the topsoil.

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The Great Green Wall initiative in Africa’s Sahel region aims to restore 100 million hectares of degraded land to halt Saharan expansion.

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India’s planned "Green Wall" involves developing a contiguous green ecological corridor along the Aravalli mountain range.

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Drip and micro-irrigation systems deliver targeted moisture directly to plant root zones, cutting agricultural water waste by 50 percent.

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Sand dunes and moving dust storms originating in degraded drylands impair air quality and disrupt weather patterns thousands of miles away.

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Dryland ecosystems store approximately 30 percent of the world’s terrestrial organic carbon, largely within subsoil mineral complexes.

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Preserving dryland integrity is essential to mitigating forced climate migration, rural poverty, and localized resource conflicts.

Subject Specialist Commentary

Analytical perspective & practical exam advice from the Master10 academic board

Educator's Insight

The Dryland Congress 2026 highlighted solutions for arid ecosystems, which cover about 41 percent of Earth's land surface and support over two billion people. Drylands are defined by an Aridity Index under 0.65, meaning atmospheric water demand far exceeds rainfall. They host 44 percent of cultivated land and half the world's livestock. Unsustainable farming and climate shifts trigger desertification, stripping topsoils of organic carbon and water.

For UPSC prelims and State PSC exams, remember that the UN Convention to Combat Desertification (UNCCD, 1994) is the only legally binding treaty on land degradation. Connect this with SDG target 15.3 on Land Degradation Neutrality. Note India's commitments: hosting UNCCD COP14 and planning the Aravalli Green Wall. Questions also test traditional rainwater harvesting systems like tankas, johads, and khadins.

What Was the Dryland Congress 2026: Dryland Ecology & Desertification

Key Concepts & Self-Assessment22 Key Facts

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