The Fate of Zn in Agricultural Soils: A Stable Isotope Approach to Anthropogenic Impact, Soil Formation, and Soil-Plant Cycling
The Fate of Zn in Agricultural Soils: A Stable Isotope Approach to Anthropogenic Impact, Soil Formation, and Soil-Plant Cycling
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DOI：
10.1021/acs.est.8b03675
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发表时间：
2019-04-16
影响因子：
11.4
通讯作者：
Bigalke, Moritz
中科院分区：
文献类型：
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作者：
Imseng, Martin;Wiggenhauser, Matthias;Bigalke, Moritz
在农场动物饲料中补充锌和通过粪肥排泄导致非预期的锌输入到农业系统中，这可能会损害长期的土壤肥力。在瑞士的三个草地站点的锌通量的相关输入（大气沉积，粪肥，风化）和输出（渗漏水，生物量收获）在一个水文年的详细分析。最重要的锌输入发生在动物粪便（1076-1857克公顷（-1）年（-1））和锌质量平衡显示净锌积累（456-1478克公顷（-1）年（-1））。我们使用Zn稳定同位素来评估人类活动和自然长期过程对土壤中Zn分布的重要性。土壤植物循环和母质风化被确定为最重要的过程，在整个土壤形成期间（13 700年），而土壤pH值强烈影响锌同位素分馏的方向。与过去13700年的自然过程相比，最近人为输入的锌只有较小的影响。然而，这种情况在未来可能会改变，因为如果锌的投入保持在与今天相同的水平，那么在未来100年内，0-20 cm层的锌储量将增加22-68%。
The supplementation of Zn to farm animal feed and the excretion via manure leads to an unintended Zn input to agricultural systems, which might compromise the long-term soil fertility. The Zn fluxes at three grassland sites in Switzerland were determined by a detailed analysis of relevant inputs (atmospheric deposition, manure, weathering) and outputs (seepage water, biomass harvest) during one hydrological year. The most important Zn input occurred through animal manure (1076-1857 g ha(-1) yr(-1)) and Zn mass balances revealed net Zn accumulations (456-1478 g ha(-1) yr(-1)). We used Zn stable isotopes to assess the importance of anthropogenic impacts and natural long-term processes on the Zn distribution in soils. Soil-plant cycling and parent material weathering were identified as the most important processes, over the entire period of soil formation (13 700 years), whereas the soil pH strongly affected the direction of Zn isotopic fractionation. Recent anthropogenic inputs of Zn only had a smaller influence compared to the natural processes of the past 13 700 years. However, this will probably change in the future, as Zn stocks in the 0-20 cm layer will increase by 22-68% in the next 100 years, if Zn inputs remain on the same level as today.