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首页> 外文期刊>Ecological research >Effects of soil origin and current microclimate conditions on nitrogen mineralization in forest soil on different slope aspects in Hokkaido, Japan
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Effects of soil origin and current microclimate conditions on nitrogen mineralization in forest soil on different slope aspects in Hokkaido, Japan

机译：日本北海道不同坡向土壤来源和当前微气候条件对森林土壤氮矿化的影响

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摘要

Climate change may alter the rate of soil N transformation. Therefore, it is important to investigate how climate conditions and soil properties affect soil N transformation. In the present study, soil transplantation experiments were performed using soils on a xeric south-facing slope and a mesic north-facing slope in cool-temperate broad-leaved natural forests. Soil N transformation rates and leaching between slopes were compared using the resin-core method to clarify whether soil history (soil origins) or current environmental condition (locations) is the most important factor affecting soil N dynamics. The annual N mineralization did not differ significantly among soil from different origins and locations. In both locations, the annual net ammonification in south-facing soils was higher than that in north-facing soils, whereas the annual nitrification of north-facing soil was higher than that of south-facing soil. N mineralization and nitrification in north-facing soil were significantly higher during the growing season. N mineralization in south-facing soil was not significantly different between seasons. The interaction effect among seasons, soil origin, and location on net ammonification was significant. Net ammonification was higher in south-facing than in north-facing soils, and on south-facing than on north-facing slopes during the dormant season, suggesting that environmental change during winter affected the ammonification of south-facing soil. During the dormant season, N mineralization and leaching were not enhanced in soil of either origin at the transplanted locations, compared with the original locations, suggesting that, in this region, snow regime changes might not enhance the risk of N loss from forest ecosystems.
机译：气候变化可能会改变土壤氮的转化率。因此，研究气候条件和土壤特性如何影响土壤氮的转化非常重要。在本研究中，土壤移植实验是在低温温带阔叶天然林中的旱生南坡和中生北坡的土壤上进行的。使用树脂核心方法比较了土壤氮的转化率和坡度之间的淋溶，以阐明土壤历史（土壤起源）或当前环境条件（位置）是否是影响土壤氮动态的最重要因素。在不同来源和不同地点的土壤中，年度氮矿化没有显着差异。在这两个地方，朝南土壤的年净氨化度高于朝北土壤，而朝北土壤的年硝化度高于朝南土壤。在生长期，朝北土壤中的氮矿化和硝化作用显着增加。朝南土壤中的氮矿化在不同季节之间没有显着差异。季节，土壤来源和位置之间的相互作用对净氨化的影响是显着的。在休眠季节，朝南土壤的净氨化水平高于朝北土壤，朝南的土壤净氨化水平高于朝北的斜坡，这表明冬季的环境变化影响了朝南土壤的氨化作用。与原始位置相比，在休眠季节期间，无论是在原始位置还是在移植位置，两种来源的土壤中的氮矿化作用和淋溶作用均未增强，这表明在该地区，降雪状况的变化可能不会增加森林生态系统氮损失的风险。

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