Abstract: An investigation of low temperature was made in Kongyuan village of Minhou County,Fujian Province,in winter 2005/2006.The maximum low temperature in clear days increased as the altitude of hills increased for the hills with the relative altitude difference about 60m.The closer to the top of hills,the higher the maximum low temperature was.The highest maximum low temperature in clear days was observed in the middle or upper parts of the hills for the hills with the relative altitude difference about 86m.Kongyuan village was encircled by hills.There was only a narrow exit on the southwest of the village,where the cold air was easy to enter and hard to go out.Therefore,the maximum low temperature was relative low.The inversion in sloping fields reflected the differences of the maximum low temperature among the locations of different slopes for same hill.The biggest inversion difference of two hills was observed by 2.6℃.However,the inversion should not be magnified in the selection of the orchard to be built.It was feasible to grow olive trees in hills with altitude in 140 to 180m and sloping ratio from 0.6 to 1.Terraces in the bottom of hills with altitude below 80m were suitable for tangerine growing,while the sweet orange was appropriate to grow in sloping fields.

Key words: Low temperature investigation, Low temperature investigation, Inversion in sloping field, Selection of orchard