关键词: 甲烷氧化菌, 低氧生境, 种群结构, 甲烷氧化活性, 非甲烷氧化菌

Abstract: By using the observed data of daily solar radiation and pan evaporation from E601B evaporation pan at Fukang Desert Ecological Station, Xinjiang of Northwest China, the empirical parameters of Angstrom-Prescott Model and Thom-Thony-Vauclin Model were calibrated, respectively, aimed to analyze the possible reasons of the descend of pan evaporation in southeastern Junggar Basin under the scenario of past five decades climate change. When a_s=0.3134 and b_s=0.5357, and a=0.6844 and c=1.4123, the Angstrom-Prescott Model and Thom-Thony-Vauclin Model preformed the best fitness, respectively. The calculation with Thom-Thony-Vauclin Model showed that the sum of pan evaporation in the plant growth season (April-October) in 2005-2011 ranged from 954.2 mm to 1120.0 mm, with an average of 1028.4 mm. For the variation of pan evaporation, wind speed descending contributed most (66.2%), air temperature ascending and solar radiation descending contributed 21.2% and 8.0%, respectively, whereas vapor pressure deficit descending contributed least (5.9%). Except that the relative sensitivity decreased with the increase of net radiation, the other three indicators showed opposite trends. Consequently, wind speed descending could be the most possible reason for the pan evaporation paradox in southeastern Junggar Basin.

Key words: community structure, methanotrophs, O₂limited environment, methane oxidation, non-methanotrophs.