板栗土壤中微量营养元素地球化学特征

同时采用有效态和欧共体BCR(the Community Bureau of Reference)三步提取法对0-20 cm和20-40 cm土层中Ca,Mg,Fe,Zn,Cu,Mn进行形态分析,探索燕山山区板栗土壤中微量营养元索活性、形态分布特征和迁移能力.结果表明.栗粮间作会影响板栗对营养元素的吸收,且两层土壤中各元素活性相差不大;板栗纯林中0-20 cm土层的Cu,Zn活性明显高于20-40 cm土层;淋溶褐土和褐土性土两种土壤亚类,不同栽培制度对微量营养元素在板栗土壤中的形态分布特征影响不大.Cu,Zn,Fe主要以残渣态存在,Mn主要以可还原态和残渣态存在.且弱酸提取态高于其它元素.板栗土壤中元素的迁移能力排序为:Ca>Mg>Mn>Cu>Zn>Fe.

Geochemical Characteristics of Medium and Trance Nutrient Elements in Soils of Chestnut Forest

The Ca,Mg,Fe,Zn,Cu,Mn concentration in 0 — 20 cm and 20— 40 cm soil layers in soils of chestnut forest in Yan mountain were determined by the available form and BCR three-step sequential chemical extraction experiment. The activity, characteristics of nutrient elements forms distribution and transfer ability were analyzed. Results showed that the intercrop of chestnut and grain went against chestnut's absorption of trace nutrient elements. The activity of elements had no evident difference in intercrop soils, but Cu and Zn activity was higher in 0 — 20 cm pure chestnut soil layers than in 20 — 40 cm. Two soil subtypes and different growth pattern had little influence on the distribution characteristics of trace nutrient elements forms. The main form of Cu,Zn,Fe in soils was residual. Mn was mainly associated with the deoxidized and residual forms, and the acetic acid extractable form of Mn was higher than other elements. The transfer ability of elements in chestnut soils was Ca>Mg>Mn>Cu>Zn>Fe.