文献类型：期刊文献

英文题名：Nitrous oxide emissions from stems of alder, beech and spruce in a temperate forest

作者：Wen, Yuan[1] Corre, Marife D.[1] Rachow, Christine[2] Chen, Lin[1,3] Veldkamp, Edzo[1]

第一作者：Wen, Yuan

通信作者：Wen, Y[1]

机构：[1]Univ Goettingen, Fac Forest Sci & Forest Ecol, Soil Sci Trop & Subtrop Ecosyst, Buesgenweg 2, D-37077 Gottingen, Germany;[2]Univ Goettingen, Fac Forest Sci & Forest Ecol, Forest Zool & Forest Conservat, Buesgenweg 3, D-37077 Gottingen, Germany;[3]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Peoples R China

年份：2017

卷号：420

期号：1-2

起止页码：423-434

外文期刊名：PLANT AND SOIL

收录：;Scopus(收录号：2-s2.0-85029586852);WOS:【SCI-EXPANDED(收录号:WOS:000416861200030)】；

基金：This work was funded by the Deutsche Forschungsgemeinschaft (DFG, Co 749/1-1, SFB 990/2 (project A05), DFG VE 219/14-1) and the Bundesministerium fur Bildung und Forschung (BMBF SIGNAL project 031A562A). Yuan Wen was supported by China Scholarship Council. We thank Dirk Bottger, Andriana Maslicov, Andrea Bauer, Kerstin Langs and Martina Knaust for all the field and laboratory assistance.

语种：英文

外文关键词：Alder (Alnus glutinosa (L.) Gaertn.); Beech (Fagus sylvatica L.); N2O; Plant-soil (belowground) interactions; Seasonal variability; Spruce (Picea abies (L.) karst.); Stememission

摘要：Although plants are recognized as conduits for soil-produced N2O, little is known about N2O fluxes from mature trees under field conditions as well as their contribution to total (soil + stem) N2O fluxes. Exclusion of tree-mediated N2O may thus underestimate total forest N2O fluxes. In the present study, our aims were to quantify tree-mediated N2O emissions and their seasonal patterns. We investigated in situ stem and soil N2O fluxes from mature alder trees on poorly-drained soil and mature beech and spruce trees on well-drained soils during March-October 2015. Alder, beech and spruce consistently emitted N2O via stems and all displayed clear seasonal patterns. Soil and air temperature, vapor pressure deficit, and soil N2O concentration influenced the temporal variability of stem N2O fluxes. Stem and soil N2O fluxes from the alder stand were higher than beech and spruce stands. Stem N2O fluxes accounted 8.8-9.8% of the total N2O fluxes in the beech and spruce stands but only 1.1% in the alder stand. Our study reveals the importance of field-based measurements across seasons in order to come up with reliable estimates of stem N2O fluxes. N2O estimates from temperate forests that are solely based on soil N2O flux measurements are probably conservative.