Soil nitrogen pools and plant uptake at sub-zero soil temperature in a cool temperate forest soil: a field experiment using 15N labeling
Soil nitrogen pools and plant uptake at sub-zero soil temperature in a cool temperate forest soil: a field experiment using 15N labeling
复制标题
冷温带森林土壤中零度以下土壤温度下的土壤氮库和植物吸收：使用 15N 标记的田间实验
DOI：
10.1007/s11104-015-2453-1
复制
发表时间：
2015
期刊：
影响因子：
4.9
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Ueda;U. M.;Tokuchi;N.,Hiura;T.
目的冬季地球化学过程已受到相当大的关注。生物过程（例如，微生物呼吸和植物光合作用）即使在零度以下也不会停止。然而，我们的知识植物氮（N）的吸收在零度以下的土壤温度是特别有限的落叶植物物种，在冬季没有叶子。我们研究了万年青和落叶树种的植物氮吸收和土壤氮过程在零度以下的土壤温度在冷温带森林s. MethodsIsotopiclabeled硝酸盐（NO3- 15 N）注入到土壤中作为示踪剂的植物吸收和土壤氮动态在零度以下的土壤在冷温带田间site.Resultsover一段时间的41天，万年青树种和落叶树种积累的15 N为6-48 mg/kg DW− 1。此外，铵态氮中15 N含量增加，表明铵态氮在零度以下的土壤温度下产生。15 NH 4的增加与土壤水分呈正相关，表明土壤水分在N动态在零度以下的土壤temperature.ConclusionsOur研究结果表明，植物和土壤N转化的N吸收并没有停止在零度以下的土壤温度的重要作用。需要进一步的研究，以了解在零度以下的土壤温度的N动态的重要性。
AimsWinter biogeochemical processes have received considerable attention. Biological processes (e.g., microbial respiration and plant photosynthesis) do not cease, even at sub-zero temperatures. However, our knowledge of plant nitrogen (N) uptake at sub-zero soil temperatures is particularly limited for deciduous plant species, which do not have leaves during winter. We investigated plant N uptake by evergreen and deciduous species and soil N processes during sub-zero soil temperatures in cool temperate forest soil.MethodsIsotopically labelled nitrate (NO3-15N) was injected into soil as a tracer of plant uptake and soil N dynamics at sub-zero temperature soil at a cool temperate field site.ResultsOver a period of 41 days, 6–48 mg/kg DW−1of15N accumulated in evergreen species and deciduous tree species. Furthermore, the15N content in ammonium increased, suggesting ammonium production at sub-zero soil temperatures. The increase in15NH4was positively correlated with soil moisture, indicating an important role for soil water in N dynamics at sub-zero soil temperatures.ConclusionsOur findings demonstrate that N uptake by plants and soil N transformation did not cease at sub-zero soil temperatures. Further studies are needed to understand the importance of N dynamics at sub-zero soil temperatures.