通过对江苏省徐州市樟树Cinnamomun camphora土壤理化性质的调查评价,分析引起樟树叶片黄化的主要因素.结果表明:0~30 cm土层黄化样地土壤容重比非黄化样地高20.61%,差异显著(P<0.05),30~60 cm土层土壤容重差异不显著;黄化样地土壤pH值变幅为pH 8.28~8.64,呈碱性,非黄化样地土壤pH值变幅为pH 6.57~7.45,呈中性;黄化样地和非黄化样地土壤有机质、 全氮、 有效磷、 铁、 锰质量分数差异显著(P<0.05),0~30 cm土层非黄化样地分别比黄化样地高62.84%,67.44%,74.55%,137.47%,71.25%;30~60 cm土层非黄化样地分别比黄化样地高30.89%,57.57%,134.06%,86.93%,71.38%.速效钾、 锌及铜质量分数差异不显著.黄化样地土壤pH值偏高,土壤容重偏大,土壤有机质、 全氮、 速效磷、 铁和锰质量分数偏低.推测土壤呈碱性及有效铁质量分数较低是引起樟树黄化的主要因素.%To determine the cause of leaf chlorosis of Cinnamomum camphora, soil physicochemical properties were analyzed and evaluated. Results showed that in the 0-30 cm layer, soil bulk density in yellowing plots was significantly greater (P<0.05) than that in non-yellowing plots;whereas, in the 30-60 cm layer there were no significant differences. Soil pH in yellowing plots was 8.28-8.64 and in non-yellowing plots was 6.57-7.45. For both 0-30 cm and 30-60 cm layers, yellowing plots were significantly greater than non-yellowing plots (P<0.05) for soil organic matter (SOM), total nitrogen (N), available phosphorus (P), available iron (Fe), and manganese (Mn). The yellowing plots were greater than non-yellowing plots in the 0-30 cm layer for SOM (62.84%), total N (67.44%), available P (74.55%), available Fe (137.47%), and Mn (71.25%), and in the 30-60 cm plots for SOM (30.89%), total N (57.57%), available P (134.06%), available Fe (86.93%), and Mn (71.38%). No significant differences were found for available potassium, Zn, and Cu. Thus, soil alkalinity and low available Fe were the main factors causing C. camphora yellowing.
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