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首页> 外文期刊>Plant and Soil >Fine root turnover and litter production of Norway spruce in a long-term temperature and nutrient manipulation experiment.
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Fine root turnover and litter production of Norway spruce in a long-term temperature and nutrient manipulation experiment.

机译：在长期的温度和养分操纵实验中，挪威云杉的细根更新和产仔量较高。

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摘要

Background and aims: Increased soil temperature and nutrient availability enhance soil biological activity. We studied how these affect fine root growth and survival, i.e. below-ground litter production, in relation to above-ground foliage litter production of Norway spruce (Picea abies (L.) Karst.). Methods: The treatments, irrigation (I), soil warming+irrigation (WI), fertilization+irrigation (FI) and soil warming+fertilization+irrigation (WFI) were started in 1987 (F, I) and in 1995 (W). The annual production of fine root litter was estimated from minirhizotrons (survival) and soil-cores (biomass) and the annual above-ground litter production from litter traps. Results and conclusions: The number and elongation of fine roots tended to be higher in WI and I compared to the other treatments, which may indicate nutrient shortage. Fine roots in the WFI treatment had the lowest median longevity and from three to fourfold higher below-ground litter production compared to WI, FI or I - higher soil temperature increased the litter input particularly into the mineral soil. Only fertilization increased the above-ground litter production. As warmer and more nutrient-rich soil significantly shortened the fine root lifespan and increased the litter input, the storage of carbon in boreal forest soil may increase in the future.
机译：背景和目的：提高土壤温度和养分利用率可增强土壤生物活性。我们研究了这些因素如何影响挪威云杉（Picea abies（L.）Karst）的细根生长和存活率，即地下凋落物产量与地上叶子凋落物产量的关系。方法：1987（F，I）和1995（W）开始进行处理，灌溉（I），土壤加温+灌溉（WI），施肥+灌溉（FI）和土壤加温+施肥+灌溉（WFI）。细根凋落物的年产量是根据小型根生动物（存活的）和土壤核心（生物质）估计的，而地上凋落物的年产量是由凋落物捕获器估算的。结果与结论：与其他处理相比，WI和I中细根的数量和伸长率倾向于更高，这可能表明营养不足。与WI，FI或I相比，WFI处理的细根中位数寿命最低，地下凋落物的产量高出三至四倍-较高的土壤温度尤其是增加了向矿物土壤中的凋落物输入量。只有施肥才能增加地上凋落物的产量。随着温度升高和养分含量更高的土壤大大缩短了细根寿命，增加了凋落物的投入，北方森林土壤中碳的储存量将来可能会增加。

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