A meadow afloat
The saucer-shaped meadow of Khajjiar, located at an altitude of 1,920 meters (6,300 feet) in the Dhauladhar range, is more than just a scenic pasture. The ground itself is a spongy, living mat of sediment and vegetation overlaying a small lake. In the center, a cluster of grass and weeds forms a literal floating island, a dense raft of organic matter that drifts on the lake's surface.
This entire ecosystem is a type of bog, where high acidity and low oxygen levels dramatically slow the rate of decomposition. Over millennia, dead plant material, primarily from reeds and grasses, has accumulated and compressed to form a deep layer of peat. This peat layer is a massive natural sponge, absorbing water from monsoon rains and seasonal streams and then releasing it slowly. This process helps sustain the surrounding dense forests of deodar cedar, blue pine, oak, and rhododendron. The lake itself occupies a tectonic depression, a bowl-shaped feature formed by geological uplift associated with the formation of the Himalayas. The underlying rock includes Silurian-era slates and schists over granite and gneiss.
A chronicle of climate
The peat bog beneath Khajjiar's meadow is a record of climate. Each layer of sediment contains pollen, spores, and microscopic plant fragments from the time it was formed. By drilling core samples and analyzing these trapped remains—a science known as palynology—researchers can reconstruct the region's environmental history with detail.
Pollen analysis, or palynology, of the Khajjiar deposits reveals a vegetational history that begins around 2000 B.C. with a predominance of oak forests. These oak woods remained the dominant feature for centuries. A temporary decline in oak pollen, corresponding to a rise in elm and walnut pollen around 150 A.D., suggests a period of deforestation. Later, around 700 A.D., pollen records show another decline in oaks, this time replaced by deodar trees, a change attributed to human activity. More recent studies of lake sediments have identified distinct periods of climate fluctuation, including a phase of strong aridity from roughly 3,300 to 2,990 years before present, followed by a shift to warmer and more humid conditions with an enhanced monsoon. These layered records provide a long-term context for understanding climate dynamics in the Western Himalayas.