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首页> 外文期刊>Journal of plant nutrition and soil science >Substantial net N mineralization during the dormant season in temperate forest soils
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Substantial net N mineralization during the dormant season in temperate forest soils

机译：温带森林土壤在休眠期大量净氮矿化

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In temperate forest soils, N net mineralization has been extensively investigated during the growing season, whereas N cycling during winter was barely addressed. Here, we quantified net ammonification and nitrification during the dormant season by in situ and laboratory incubations in soils of a temperate European beech and a Norway spruce forest. Further, we compared temperature dependency of N net mineralization in in situ field incubations with those from laboratory incubations at controlled temperatures. From November to April, in situ N net mineralization of the organic and upper mineral horizons amounted to 10.9 kg N (ha · 6 months)~(-1) in the spruce soil and to 44.3 kg N (ha · 6 months)~(-1) in the beech soil, representing 65% (beech) and 26% (spruce) of the annual above ground litterfall. N net mineralization was largest in the Oi/Oe horizon and lowest in the A and EA horizons. Net nitrification in the beech soil [1.5 kg N (ha · 6 months)~(-1)] was less than in the spruce soil [5.9 kg N (ha · 6 months)~(-1)]. In the range of soil temperatures observed in the field (0-8°C), the temperature dependency of N net mineralization was generally high for both soils and more pronounced in the laboratory incubations than in the in situ incubations. We suggest that homogenization of laboratory samples increased substrate availability and, thus, enhanced the temperature response of N net mineralization. In temperate forest soils, N net mineralization during the dormant season contributes substantially to the annual N cycling, especially in deciduous sites with large amounts of litterfall immediately before the dormant season. High Q_(10) values of N net mineralization at low temperatures suggest a huge effect of future increasing winter temperature on the N cycle in temperate forests.
机译：在温带森林土壤中，已经在生长季节对氮净矿化进行了广泛研究，而冬季氮循环几乎没有得到解决。在这里，我们通过在温带欧洲山毛榉和挪威云杉林的土壤中进行原位和实验室孵化，对休眠期的净氨化作用和硝化作用进行了量化。此外，我们将原位温育中N净矿化的温度依赖性与在受控温度下实验室温育中的温度依赖性进行了比较。从11月到4月，云杉土壤中有机层和上部矿物层的原位净氮矿化量为10.9 kg N（ha·6个月）〜（-1），云杉土壤中的净N为44.3 kg N（ha·6个月）〜（ -1）在山毛榉土壤中，占地上每年凋落物的65％（山毛榉）和26％（云杉）。氮净矿化在Oi / Oe范围最大，在A和EA范围最低。山毛榉土壤的净硝化作用[1.5 kg N（ha·6个月）〜（-1）]小于云杉土壤的净硝化作用[5.9 kg N（ha·6个月）〜（-1）]。在田间观察到的土壤温度范围内（0-8°C），两种土壤中N净矿化的温度依赖性通常都很高，在实验室培养中比在原位培养中更明显。我们建议对实验室样品进行均质化可增加底物的利用率，从而增强N净矿化的温度响应。在温带森林土壤中，休眠季节的N净矿化作用对年度N循环有很大贡献，尤其是在休眠季节即将来临之前落叶量大的落叶地。低温下氮净矿化的高Q_（10）值表明，未来冬季温度升高对温带森林中氮循环的巨大影响。

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