Zhang, Y.; Wang, J.; Dai, S.; Sun, Y.; Chen, J.; Cai, Z.; Zhang, J. & Müller, C. (2019): <b>Temperature effects on N2O production pathways in temperate forest soils</b>. <i>Science of the Total Environment</i> <b>691</b>, 1127-1136<br>DOI: <a href="http://dx.doi.org/10.1016/j.scitotenv.2019.07.208" target="_blank">http://dx.doi.org/10.1016/j.scitotenv.2019.07.208</a>.
Resource Description
Title:
Temperature effects on N2O production pathways in temperate forest soils
FOR816dw ID:
20
Publication Date:
2019-07-16
License and Usage Rights:
DASIM data user agreement. (www.dasim.de/dataagreementp3.do)
Highlights<br/>
•N2O production rates via denitrification declined with decreasing temperature.<br/>
•N2O production rates via autotrophic nitrification were significantly and positively correlated with incubation temperature.<br/>
•N2O production rates via heterotrophic nitrification also showed a significantly positive correlation with temperature.<br/>
•The results in the field experiments were corresponded to the laboratory results.<br/>
<br/>
Nitrous oxide (N2O) is an important greenhouse gas and contributes to stratospheric ozone depletion. Increasing temperature generally exerts a positive effect on soil N2O production. However, not much is known on the temperature influence on individual N2O production pathways. In this study, both laboratory 15N labelling experiments with an incubation temperature gradient (35?°C, 25?°C, 15?°C, 5?°C) and field 15N labelling experiments carried out in different seasons were conducted in Korean pine forest (KF) and Redwood coniferous forest (RF) soils. The results showed that the contribution of denitrification was positively correlated with temperature in KF and negatively correlated with temperature in RF, while their N2O production rates via denitrification (N2Od) all declined with decreasing temperature. The contribution of autotrophic nitrification in KF ranged from 11% to 21%, while the contribution in RF significantly increased with decreasing temperature (P?<?0.05). However, the N2O production rates via autotrophic nitrification process (N2Oa) were significantly and positively correlated with incubation temperature (P?<?0.05). In addition, the contribution of heterotrophic nitrification to N2O production showed a negative and positive relation with increasing temperature in KF and RF, respectively. Whereas, the N2O production rates via heterotrophic nitrification (N2Oh) showed a significantly positive correlation with temperature (P?<?0.05), but a negative relation with gross heterotrophic nitrification rates. The results in the field experiments corresponded to the laboratory results, indicating that the methods applied in field experiments were suitable for the estimation and prediction of in situ N2O production. The response of calculated N2O production rates to seasonal temperature in KF during the year of 2015–2017 also confirmed the suitability of the field research methods. This novel in situ technique to determine N2O production in temperate forest soils should be validated for other ecosystems.
