博斯腾湖流域潜在蒸散发时空演变及归因分析

doi:10.12118/j.issn.1000-6060.2019.01.12

Abstract

Abstract: Evapotranspiration is the most important part of the watershed hydrologic cycle. Analysis of the sensitivity of ET0 to meteorological factors is helpful to understand the water cycle process of the basin, and also is important to the optimal allocation of water resources. Based on the meteorological data of 9 meteorological stations in the Bosten Lake Basin from 1970 to 2014, this study calculated and analyzed the temporal and spatial evolution of potential evapotranspiration by using improved Penman-Monteith formula, and the sensitivities of Penman-Monteith potential evapotranspiration to the daily maximum temperature, minimum temperature, wind speed,net radiation, relative humidity, and vapor pressure were analyzed. In addition, this study calculated the contribution of major meteorological factors to ET0. The results showed that: (1) At the interannual scale, ET0 in the mountainous region showed a significant reduction trend during the period from 1970 to 2000 (P <0.01), but since 2000, ET0 showed a slightly upward trend. ET0 in the plain region presented a significant decreasing trend (P <0.01) at a rate of -77 mm·(10a)-1 in the time period from 1970 to 1993, however, since 1993, the tendency was reversed to an upward tendency at a rate of 83.8 mm·(10a)-1 (P <0.01). The rangeability of ET0 in the plain oasis region was stronger than that in the mountainous areas. (2) At the seasonal scale, ET0 was the highest in summer followed by the spring and autumn, and ET0 in winter was the least. ET0 reached the highest in June and lowest in Janaury at the monthly scale, and had a greater dispersion from May to August, which indicated that ET0 changed intensively in this period. (3) Wind speed and net radiation were the most sensitive variable to ET0 in the Bosten Lake Basin, but the relative change rate of net radiation was small. (4) The contribution of net radiation and wind speed on ET0 changes were the largest in the mountainous region; and the wind speed was the dominant factor in the plain, which contributed more than 50% to ET0. The analysis of the contribution of meteorological factors on potential evapotranspiration in Bosten Lake Basin can provide scientific basis for water resources allocation and downstream ecological restoration.

ZHONG Qiao, JIAO Li, LI Zhi, JIAO Wei, CHEN Ya-ning. Spatial and temporal changes of potential evapotranspiration and its attribution in the Bosten Lake Basin[J].干旱区地理, 2019, 42(1): 103-112.

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Spatial and temporal changes of potential evapotranspiration and its attribution in the Bosten Lake Basin

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