关键词: 激光显微切割, 激光显微切割, 植物生物学, 操作流程, 研究进展

Abstract: Based on the data of pan evaporation and related meteorological elements for nearly 37 years of 1977-2013 from 17 meteorological observations in Linfen, the climate change characteristics and influencing factors of pan evaporation were analyzed by using methods of linear tendency analysis, accumulative anomaly and complete correlation coefficient. The results showed that: evaporation contribution in summer and spring was prominent, which accounted for about 39.3% and 34.0% respectively throughout the year, the followed by evaporation in autumn and winter, and evaporation in winter was least. Pan evaporation for 37 years presented a declining volatility trend; the evaporation in the four seasons had a downward trend, and the decline of evaporation in summer was most obvious, followed by autumn; besides, the change rate of evaporation in summer, autumn, spring and winter were -26.30 mm/10 a, -16.47 mm/10 a, -10.47 mm/10 a, -7.91 mm/10 a, respectively. From the point of decadal characteristics, decadal change of the overall annual evaporation in Linfen presented “increase-reduce” trend; from the view of seasonal change characteristics, the spring presented “reduce-increase” trend, summer and autumn presented “increase-reduce” trend, winter presented reducig trend. There were obviously positive correlation between evaporation and temperature, sunshine hours, diurnal range, but there were negative correlation between evaporation and precipitation, vapor pressure, relative humidity. The temperature, sunshine hours were the major factors affecting the downward pan evaporation in Linfen.