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RESEARCH ON THE TECHNIQUE OF DRIP IRRIGATION UNDER FILM FORCASH-TREES PLANTED IN FISH-SCALE PITS ON LOESS SLOPE-LAND Spatial Distribution Pattern and Sampling Technique of Batocera lineolata(Coleoptera:Cerambycidae) Population in Ash Trees Geostatistical analysis on the spatial distribution of Batocera lineolata (Coleoptera:Cerambycidae) populations in different types of ash tree forests