Purposes—To investigate the influence of planting years on soil organic carbon content and the distribution characteristics in apple orchards,and to provide reference basis for improving soil fertility of the orchard and increasing orchard yield.Methods—Taking apple orchards with the plant-ing years of 5 a,10 a,15 a and 20 a in Weibei regions as the research object,the soil organic carbon content of apple orchards was determined with potassium dichromate external heating method.Re-sults—(1)With the increase of planting years,the soil organic carbon content of apple orchards with different planting years showed a tendency of decreasing and then increasing on the overall average,and there was a significant difference between different planting years(P＜0.05),of which,the or-ganic carbon content of apple orchards with planting years of 5 a was the highest,6.83 g/kg.(2)In the horizontal direction of 0.5 m,1 m and 1.5 m from the tree trunk,except for the soil in the or-chard with planting years of 5 a,the closer to the tree trunk,the higher the soil organic carbon con-tent.Except for the soil in the orchard with planting years of 15 a,the trend of soil organic carbon content in orchards with different planting years differed significantly from the trunk at 0.5 m,1 m and 1.5 m(P＜0.05).(3)In the vertical profiles of different planting years,the organic carbon con-tent of apple orchards with different planting years fluctuated greatly in the range of 0～40 cm soil depth,and showed a decreasing trend with the increase of the soil depth,and in addition,the soil in the apple orchard with planting years of 5 a showed a decreasing trend in the range of 0～40 cm soil depth,with the increase of the soil depth.In addition,the soil organic carbon content of apple or-chards with planting years of 5 a increased significantly in the depth of 200～320 cm.Conclusions—The soil organic carbon content of apple orchards with different planting years in Weibei regions showed a tendency of decreasing and then increasing with the increase of planting years.In the hori-zontal direction,orchards with different planting years had high organic carbon content near the dry-ness,which had a greater influence on the organic carbon endowment of the orchards.In the vertical direction,the organic carbon content was concentrated in the shallow soil layer,showing the charac-teristics of epilimnion.
soil organic carbonapple orcharddifferent planting yearsdistribution characteris-ticsWeibei regions
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