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首页> 外文期刊>土壤圈（英文版） >Soil Properties in Coniferous Forest Stands Along a Fly Ash Deposition Gradient in Eastern Germany
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Soil Properties in Coniferous Forest Stands Along a Fly Ash Deposition Gradient in Eastern Germany

机译：德国东部沿粉煤灰沉积梯度的针叶林林地土壤特性

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摘要

Physical, chemical, and microbial properties of forest soils subjected to long-term fly ash depositions were analyzed in spruce (Picea abies (L.) Karst.) stands of eastern Germany on three forest sites along an emission gradient of 3 (high input), 6, and 15 km (low input) downwind of a coal-fired power plant. Past emissions resulted in an atypical high mass of mineral fly ash constituents in the organic horizons at the high input site of 128 t ha-1 compared to 58 t ha-1 at the low input site. Magnetic susceptibility measurements proved that the high mineral content of the forest floor was a result of fly ash accumulation in these forest stands. Fly ash deposition in the organic horizons at Site Ⅰ versus Ⅲsignificantly increased the pH values, effective cation exchange capacity, base saturation and, with exception of the L horizon, concentrations of mobile heavy metals Cd, Cr, and Ni, while stocks of organic C generally decreased. A principal component analysis showed that organic C content and base status mainly controlled soil microbial biomass and microbial respiration rates at these sites, while pH and mobile fractions of Cd, Cr, and Ni governed enzyme activities. Additionally,it was hypothesized that long-term fly ash emissions would eventually destabilize forest ecosystems. Therefore, the results of this study could become a useful tool for risk assessment in forest ecosystems that were subjected to past emissions from coal-fired power plants.
机译：在德国东部的云杉（Picea abies（L.）Karst。）林分中，在三个森林站点上沿3的排放梯度（高投入）分析了遭受长期粉煤灰沉积的森林土壤的物理，化学和微生物特性。 ，6号和15公里（低输入）的燃煤发电厂的顺风。过去的排放导致高输入点128 t ha-1的有机层中非典型的矿物粉煤灰成分大量增加，而低输入点则为58 t ha-1。磁化率测量证明，林地中较高的矿物质含量是这些林分中飞灰积聚的结果。站点Ⅰ和站点Ⅲ中有机层中的粉煤灰沉积显着提高了pH值，有效的阳离子交换能力，碱饱和度，除了L层外，还增加了可移动重金属Cd，Cr和Ni的浓度，而有机C的存量一般下降。主成分分析表明，有机碳含量和碱状态主要控制这些部位的土壤微生物生物量和微生物呼吸速率，而pH，Cd，Cr和Ni的流动性决定酶的活性。此外，有假设认为，长期的粉煤灰排放最终会破坏森林生态系统的稳定性。因此，这项研究的结果可能成为评估燃煤电厂过去排放的森林生态系统中风险的有用工具。

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