Substantial net N mineralization during the dormant season in temperate forest soils
Substantial net N mineralization during the dormant season in temperate forest soils
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温带森林土壤休眠季节大量净氮矿化
DOI：
10.1002/jpln.201300644
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发表时间：
2014
影响因子：
2.5
通讯作者：
Egbert Matzner
中科院分区：
文献类型：
--
作者：
Marianne Schütt;Werner Borken;Claus Florian Stange;Egbert Matzner
在温带森林土壤中，氮素净矿化在生长季节得到了广泛的研究，而冬季的氮素循环几乎没有被研究过。在这里，我们通过在温带欧洲山毛榉和挪威云杉林土壤中的环境和实验室培养来量化休眠季节的净氨化和硝化作用。此外，我们比较了现场培养的氮净矿化与实验室受控温度培养的N净矿化的温度依赖性。从11月到4月，云杉土壤有机层和上层矿物层的N净矿化量分别为10.9 kg N(ha·6个月)-1和44.3 kg N(ha·6个月)-1，分别占全年地上凋落物的65%和26%。N净矿化以OI/OE层最大，A层和EA层最低。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[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℃)，两种土壤氮素净矿化的温度依赖性一般都很高，实验室培养条件下的土壤氮素净矿化作用比实验室培养条件下更明显。我们认为，实验室样品的均质增加了底物的可用性，从而增强了氮净矿化的温度响应。在温带森林土壤中，休眠季节的N净矿化对每年的N循环有很大的贡献，特别是在休眠季节之前有大量凋落物的落叶地。低温下氮素净矿化的高Q10值表明，未来冬季气温升高对温带森林的氮循环有巨大影响。
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 byin situand laboratory incubations in soils of a temperate European beech and a Norway spruce forest. Further, we compared temperature dependency of N net mineralization inin situfield incubations with those from laboratory incubations at controlled temperatures. From November to April,in situN net mineralization of the organic and upper mineral horizons amounted to 10.9 kg N (ha · 6 months)–1in the spruce soil and to 44.3 kg N (ha · 6 months)–1in 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 thein situincubations. 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 Q10values of N net mineralization at low temperatures suggest a huge effect of future increasing winter temperature on the N cycle in temperate forests.
欧洲山毛榉树近端和远端茎区的土壤氮周转
影响因子：
4.9
作者：
Shih;E. Matzner
通讯作者：
E. Matzner
土壤混合对美国佛蒙特州两片落叶林土壤硝化率的影响
影响因子：
4.9
作者：
A. Kaur;D. Ross;G. Fredriksen
通讯作者：
G. Fredriksen