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首页> 外文期刊>International journal of soil science >The Distribution of Zinc Fractions in Surface Samples of Selected Agricultural Soils of Zambia
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The Distribution of Zinc Fractions in Surface Samples of Selected Agricultural Soils of Zambia

机译：赞比亚部分农业土壤表面样品中锌组分的分布

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Soil parent material, pedo-chemical transformations and anthropogenic interventions play important roles in the distribution of zinc (Zn) into its various forms in the soil and ultimately, its bio-availability for plant uptake. Therefore knowledge of the soil Zn forms is useful for its management. This study defined five mechanistic Zn pools in 11 cultivated agricultural soils of Zambian and their uncultivated pairs. A batch extraction scheme was used to estimate exchangeable (Ex-Zn), carbonate (CO3-Zn), organic (Org-Zn), sesquioxide (Ox-Zn) and residual (Res-Zn) Zn pools in each soil. Total Zn was calculated as a sum of the pools and it ranged from 13.11 to 108.02 mg kg-1 with an average of 52.26 mg kg-1. The distribution of Zn in the soils on the basis of average concentrations was in the order 22.99 mg kg-1 Ox-Zn (44%)>14.97 mg kg-1 Res-Zn (29%)>7.51 mg kg-1 CO3-Zn (14%)>4.81 mg kg-1 Org-Zn (9%)>1.98 mg kg-1 Ex-Zn (4%). Cultivation depressed Tot-Zn and Ex-Zn concentrations in several of the soils. Correlation analysis (n = 44) showed that Tot-Zn increased along with soil clay content (r = 0.50, p = 0.03) as well as soil Cation Exchange Capacity (CEC) (r = 0.60; p = 0.007), CO3-Zn increased with CEC (r = 0.68, p = 0.001) and Res-Zn increased with soil clay content (r = 0.53; p = 0.02). The fact that the chemistry of Zn in this set of soils appears to be dominated by the more stable fractions offers an explanation for the common notion held that majority of Zambian soils have low soil Zn test levels which accounts for low Zn bio-availability.
机译：土壤母质，土壤化学转化和人为干预在锌（Zn）在土壤中以各种形式的分布以及最终对植物吸收的生物利用度起着重要作用。因此，了解土壤锌的形态对于其管理很有用。这项研究在赞比亚的11种耕作农业土壤及其未耕作对中定义了5个机械锌池。使用分批萃取方案估算可交换的（Ex-Zn），碳酸盐（CO 3 -Zn），有机的（Org-Zn），倍半氧化物（Ox-Zn）和残留的（Res-Zn）每种土壤中都有锌矿藏。总锌的计算是总库，范围从13.11到108.02 mg kg -1 ，平均为52.26 mg kg -1 。锌在土壤中的分布以平均浓度为基础，依次为22.99 mg kg -1 Ox-Zn（44％）> 14.97 mg kg -1 Res -Zn（29％）> 7.51 mg kg -1 CO 3 -Zn（14％）> 4.81 mg kg -1 Org-Zn （9％）> 1.98 mg kg -1 Ex-Zn（4％）。耕种抑制了几种土壤中Tot-Zn和Ex-Zn的浓度。相关分析（n = 44）表明，Tot-Zn随土壤黏土含量（r = 0.50，p = 0.03）以及土壤阳离子交换容量（CEC）（r = 0.60; p = 0.007）而增加，CO 3 -Zn随着CEC的增加而增加（r = 0.68，p = 0.001），而Res-Zn随着土壤黏土含量的增加而增加（r = 0.53; p = 0.02）。这组土壤中锌的化学成分似乎主要由较稳定的部分所支配，这一事实为以下普遍观念提供了解释：赞比亚大多数土壤的土壤锌测试水平较低，这说明锌的生物利用度较低。

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