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Study on the characteristics of microclimate for a sugar apple orchard at reclaimed land of Taitung area.

This study was performed to observe the characteristics of microclimate for a sugar apple orchard at a reclaimed land of Taitung area. The selected sugar apple orchard (22°44’36” N, 121°4’56” E) had a size of 1.8 ha and was located at suburb of Taitung City, Taitung Hsien, Taiwan, within a gradual topography. The factors of micrometeorological observations included air temperature, relative humidity, earth temperature, wind direction, wind speed, net radiation and soil heat flux, and were measured using a tower of 4 m in height from March 1, 2007 to February 12, 2008. The preliminary results are summarized as follows. Air temperature and relative humidity were usually greater than 20°C and 68%, but there was a decreasing tendency under cold wave with no rain. The daily mean wind speed was less than 4.6 m s-1 and the prevailing wind direction was in the directions of NE-SW. The topsoil layer of sugar apple orchard could absorb heat flux when net radiation was grater than 0.2 MJ m-2. Irrigation could increase soil moisture and resulted in an increase of earth temperature to more than 15°C, and the mitigation of cold damage for sugar apple orchard could be achieved under such condition.