| 摘 要： |
To determine lake carbon (C) cycling storage, transport, and transformation functions, it is necessary to understand metabolic lacustrine changes and associated drivers, all of which are premised on accurate metabolic estimates. The continuous improvement in conventional metabolic lake methods and the emergence of novel relevant methods in recent years have led to confusion as to their usage. Although O-18/16 technology has recently been more widely used, its applicability remains controversial among researchers. The Qinghai-Tibet Plateau (QTP) is an exceptional location for such experimental studies, primarily due to its many different natural lake types. This study used O-18/16 technology to investigate 19 lakes of different salinity (0.0 similar to 196.0 parts per thousand), area (5.0 similar to 4345.9 km(2)), and altitude grades (2549.9 similar to 4541.8 m) on the QTP to determine their specific metabolism. Results show that O-18/16 technology is not suitable for use for high saline and low dissolved oxygen lakes (i.e., a salinity level greater than 35 parts per thousand and a dissolved oxygen level < 4 mg L-1). Under low dissolved oxygen conditions caused by high salinity, alterations in isotopic fractionation will cause O-18/16 technology to fail. These findings can be used as a reference for estimating lake metabolism as well as researching nutrient cycling while also promoting metabolic estimation method improvements. |
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