ISSN:
1573-5117
Keywords:
water chemistry
;
productivity
;
14C method
;
marl lake
;
Kashmir Himalayas
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract L. Naranbagh (alt. 1587 m) is a polymictic, shallow marl lake in the flood-plain valley of Kashmir, India. Macrofloral affinities resemble ‘Potamogeton Type’ of Forsberg (1965) with alkaline waters, not rich in phosphorus. CaCO3 precipitation coupled with decline in Ca2+ and alkalinity values are characteristic of the lake. Fluctuations in Mg2+, Na+, K+, and Cl− were relatively conservative. The levels of PO inf4 sup3− -P and NO inf3 sup− -N indicate moderate fertility of the lake water. Persistence of a summer-autumn planktonic algal pulse is related to favourable irradiance, high water temperatures, and increased photosynthetic efficiency values. The most striking seasonality in photosynthetic rates (m−2 h−1) between winter minimum (Σ3 mg Cassim) and summer maximum (Σ75.4 mg Cassim) is determined by mainly climatic changes. Energy flow gave annual phytoplankton production of 51.95 × 102 KJ m−2 for the ecosystem. The nutrient levels and productivity rates suggest mesotrophic status of L. Naranbagh in classic oligoeutrophic classification of lake types.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00006535
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