Abstract
Micrometeorological observations were made during the winter, summer, monsoon and post-monsoon seasons in grassland at Bikaner (28° 3’ N, 73° 5’ E) and Chandan (26° 55’ N, 70° 55’ E). Profiles of air temperature, radiation penetration, net and total radiation and soil temperatures were recorded over a period of three years. The percentage of net to total radiation was found to be greatest during the growing season and minimal when the grass was dry. Radiation penetration into the mixed grassland at Bikaner was less than at Chandan where the grassland is dominated by a single grass species ( Lasiurus sindicus ). The thermal regimes at Chandan were greatly affected during the non-growing season by the intense radiation, high soil surface temperatures and the presence of only one species of grass. Considerable heat loss through long wave radiation is a common feature of these grasslands in dry weather when surface soil temperatures exceed 50 °C.
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