Soil warming decreases inorganic and dissolved organic nitrogen pools by preventing the soil from freezing in a cool temperate forest
Soil warming decreases inorganic and dissolved organic nitrogen pools by preventing the soil from freezing in a cool temperate forest
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DOI：
10.1016/j.soilbio.2013.02.016
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发表时间：
2013-06
影响因子：
9.7
通讯作者：
Miki U. Ueda;O. Muller;Masahiro Nakamura;T. Nakaji;T. Hiura
中科院分区：
文献类型：
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作者：
Miki U. Ueda;O. Muller;Masahiro Nakamura;T. Nakaji;T. Hiura
我们报道了在冬季发生温和冻融循环的凉爽温带森林中，土壤氮库对土壤变暖的季节性响应。为了防止土壤冻结，对土壤进行了2 ~ 5℃的人工升温，从而可以评价土壤冻结对土壤特性的影响。在对照点，溶解有机氮和NH4-N库在冬季最大。土壤变暖使这些溶质库在冬季减少到对照水平的17-25%，而在其他季节则没有减少。这些结果证实了土壤冻结是冬季氮动态的驱动力，并且在研究地点很容易失去几度的升温。冷温带森林溶质氮库的大量减少可能导致氮有效性降低。
We report on the seasonal responses of soil nitrogen (N) pools to soil warming in a cool temperate forest where mild freeze–thaw cycles occur during winter. Artificial soil warming of 2–5 °C was implemented to prevent freezing, making it possible to evaluate the effects of soil freezing on soil characteristics. At control sites, the dissolved organic N and NH4–N pools were largest in winter. Soil warming decreased these solute pools to 17–25% of control levels during winter, but not in other seasons. These results confirm that soil freezing is the driving force of N dynamics during winter, and is easily lost by a few degrees of warming at this study site. The substantial reduction of solute N pools may reduce N availability in the cool temperate forest.