Soil samples were collected in spring 2013 by GPS at Carya cathayensis plantations in Lin'an district, Zhejiang province. Soil chemical properties were determined and compared. The results showed that C.cathayensis mainly distributed in the Cambrian strata, followed by the Ordovician and Jurassicone. The determination showed that soil from the Jurassic strata had the lowest pH(4.89), and lower available nutrient content,that from Cambrian strata had the highest pH(5.57) and the highest available nutrient contents, that from the Ordovician strata had medium content of nutrient contents among tested 3 strata, but there had the highest available iron(91.25 mg·kg-1)and available manganese(76.89 mg·kg-1).With the increase of soil pH, the contents of available calcium, available magnesium, available copper and available zinc increased significantly. Soil organic matter had positive relation with medium trace elements. Soil from different geological strata had different soil fertility properties, especially, the succession of medium trace element from geological strata was evident. The buffering capacity of acid in different soils was also different.%为了解临安区山核桃Carya cathayensis分布区不同地质背景下山核桃林地土壤肥力特性,利用ArcGIS对不同地质背景发育土壤的山核桃分布面积进行统计,于2013年3-4月,采用GPS野外定位并采集临安山核桃主产区189个土壤样品,并分析其主要化学性质.结果表明:(1)临安区山核桃主要分布在的寒武系地层,以及与之上接的奥陶系部分地层,其次是侏罗系地层.(2)侏罗系发育的土壤酸化最为严重(pH值4.89),有效养分含量整体较低,其中有效磷(10.19 mg·kg-1)、有效钙(359 mg·kg-1)、有效镁(52 mg·kg-1)、有效铜(0.71 mg·kg-1)、有效锌(0.84 mg·kg-1)、有效铁(59 mg·kg-1)、有效锰(54 mg·kg-1)的含量最低;寒武系发育的土壤酸化程度最低(pH值5.57),有效养分含量整体高于其他两个地层,其中有效磷(19.35 mg·kg-1)、有效钙(1313 mg·kg-1)、有效镁(137 mg·kg-1)、有效铜(2.41 mg·kg-1)、有效锌(1.24 mg·kg-1)的含量最高;奥陶系发育土壤养分含量水平居中,但有效铁(91 mg·kg-1)、有效锰(76 mg·kg-1)的含量超过其他两个地层.(3)随着土壤pH值提高,有效钙、有效镁、有效铜、有效锌等中微量元素含量显著提高,土壤有机质与中微量元素整体呈现不同程度的正相关关系.不同地层发育的山核桃林地土壤具有不同的肥力特性,特别是中微量营养元素对土壤母质的继承性明显,不同地层发育的土壤对酸的缓冲能力也存在差异,各地需要因地制宜的开展土壤酸性改良和施肥结构调整,制定以地层为管理单位的分区施肥规划.
展开▼
