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首页> 外文期刊>Soil Science >Age chronosequence effects on restoration quality of reclaimed coal mine soils in Mississippi agroecosystems.
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Age chronosequence effects on restoration quality of reclaimed coal mine soils in Mississippi agroecosystems.

机译：年龄时序对密西西比州农业生态系统中复垦煤矿土壤恢复质量的影响。

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摘要

Surface mining drastically disturbs landscapes and soil properties. Reclamation can restore and improve soil quality and biomass productivity. Time required for soil reclamation to restore soil quality to premined conditions in southeastern United States is unclear. The objective of this study was to evaluate chronosequence effects on restoration quality indicators in reclaimed coal mine soil from different land use landscapes and agroecosystems in Mississippi. Study sites in 0- to 3-, 5- to 7-, and 10- to 12-year-old reclaimed soils were compared with adjacent undisturbed sites. Soil samples collected at the 0- to 15-cm and the 15- to 30-cm depths within a grid in a radius of 3 m were mixed to produce composite samples and kept frozen until analyzed. Soil bulk density ( rho b) was the highest (1.48 g cm-3) in the youngest (<1 year) site and decreased with increasing age to the oldest (12-year) site (1.07 g cm-3). Soil quality indicators (aggregate stability, total C, organic C, and microbial biomass C) increased with increasing reclamation age in forest and grass ecosystems. Concentrations of C were greater at the summit than at shoulder and foot-slope positions. Soil pH, Ca, Mg, Cu, and Zn were higher in newly reclaimed soil than in soils reclaimed 12 years earlier possibly because of reclamation liming practices, which buffer pH to greater than 7.0 in newly reclaimed sites. Reclamation practices improved soil quality over time. Soil quality indicators reached levels similar to those of undisturbed soil within 7 to 12 years after reclamation, indicating successful reestablishment of healthy and sustainable soils in the postmining ecosystems.
机译：露天采矿极大地干扰了景观和土壤特性。开垦可以恢复并改善土壤质量和生物量生产力。在美国东南部，土壤开垦将土壤质量恢复到预定条件所需的时间尚不清楚。这项研究的目的是评估密西西比州不同土地利用景观和农业生态系统对再生煤矿土壤中恢复质量指标的时序影响。将0至3岁，5至7岁和10至12岁复垦土壤中的研究地点与相邻的未扰动地点进行了比较。将在3 m半径的网格中以0到15厘米和15到30厘米深度收集的土壤样品进行混合，以生产复合样品，并保持冷冻直至进行分析。最年轻（<1年）的土壤容重（rho b）最高（1.48 g cm -3 ），而随着年龄的增长，年龄最大（12年）的土壤容重（1.07 g）降低cm -3 ）。森林和草木生态系统中的土壤质量指标（总体稳定性，总碳，有机碳和微生物生物量碳）随着开垦年龄的增加而增加。在山顶的C浓度比在肩膀和脚倾斜的位置大。新开垦的土壤中的pH，Ca，Mg，Cu和Zn比12年前复垦的土壤要高，这可能是由于开垦石灰的做法，这使新开垦的地点的pH值大于7.0。随着时间的推移，开垦实践改善了土壤质量。在开垦后的7到12年内，土壤质量指标达到了与未扰动土壤相似的水平，表明在采后生态系统中成功重建了健康且可持续的土壤。

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