کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2024795 | 1542623 | 2013 | 4 صفحه PDF | دانلود رایگان |
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.
► Soil that undergoes freezing has more inorganic and dissolved organic soil N pools.
► Absence of freezing decreases these solute N pools.
► Effects of warming are pronounced in winter.
► Global warming will strongly affect N cycles in areas where soil does not freeze.
Journal: Soil Biology and Biochemistry - Volume 61, June 2013, Pages 105–108