+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The effect of abrupt climatic warming on biogeochemical cycling and N2O emissions in a terrestrial ecosystem

, : The effect of abrupt climatic warming on biogeochemical cycling and N2O emissions in a terrestrial ecosystem. Palaeogeography, Palaeoclimatology, Palaeoecology

The large, rapid increase in atmospheric N2O concentrations that occurred concurrent with the abrupt warming at the end of the last glacial period might have been the result of a reorganization in global biogeochemical cycles. To explore the sensitivity of nitrogen cycling in terrestrial ecosystems to abrupt warming, we combined a scenario of climate and vegetation composition change based on multiproxy data for the Oldest Dryas-B lling abrupt warming event at Gerzensee, Switzerland, with a biogeochemical model that simulates terrestrial N uptake and release, including N2O emissions. As for many central European sites, the pollen record at the Gerzensee is remarkable for the abundant presence of the symbiotic nitrogen fixer Hippopha rhamnoides (L.) during the abrupt warming that also marks the beginning of primary succession on immature glacial soils. Here we show that without additional nitrogen fixation, climate change results in a significant increase of N2O emissions of approximately factor 3.4 (from 6.4 ? 1.9 to 21.6 ? 5.9mg N2O-Nm-2 yr-1). Each additional 1mgm-2 yr-1 of nitrogen added to the ecosystem through N-fixation result in additional N2O emissions of 1.6mg N2O-Nm-2 yr-1 for the time with maximum H. rhamnoides coverage. Our results suggest that local reactions of emissions to abrupt climate change could have been considerably faster than the overall atmospheric concentration changes observed in polar ice. Nitrogen enrichment of soils due to the presence of symbiotic N-fixers during early primary succession not only facilitates the establishment of vegetation on soils in their initial stage of development, but can also have considerable influence on biogeochemical cycles and the release of reactive nitrogen trace gases to the atmosphere. Rapid climate change leads to more than a doubling of simulated N2O emissions. Simulated emissions show considerable variability between different soil types. Biological N-fixation increases N2O-release from nitrification/denitrification. Simulated N2O emissions show same trend as polar ice core records.


DOI: 10.1016/j.palaeo.2012.06.015

Other references

Pakhomova, G.V.; Iartsev, P.A.; Uteshev, N.S., 2001: Prediction of vagotomy results. Khirurgiia: 52-55

Engel, T.; Grimm, K.I.; Lutz, H.; Schmitz, M., 2009: Fossil des Jahres 2010; Bubalus murrensis, ein eiszeitlicher Wasserbueffel. Terra Nostra (Bonn)

Aleshin, A.N.; Sawa, Y.; Kitagawa-Sakakida, S.; Bando, Y.; Ono, M.; Memon, I.Ahmed.; Tohyama, M.; Ogawa, S.; Matsuda, H., 2005: 150-kDa oxygen-regulated protein attenuates myocardial ischemia-reperfusion injury in rat heart. Early contractile dysfunction and the later death of cardiomyocytes are two major problems that can follow myocardial infarction or major cardiovascular surgery that demands ischemic arrest of the heart. Here, we found that 24 h of hypoxia and 1 h...

Kunin, C.M.; Finland, M., 1959: Restrictions imposed on antibiotic therapy by renal failure. Archives of Internal Medicine 104: 1030-1050

Couchman, S.A.; Holzmann, N.; Frenking, G.; Wilson, D.J.D.; Dutton, J.L., 2014: Beryllium chemistry the safe way: a theoretical evaluation of low oxidation state beryllium compounds. A theoretical study of compounds containing Be in the +1 or 0 oxidation state has been carried out. The molecules considered containing Be in the +1 oxidation state are analogues of the important Mg(I)-Mg(I) dimer supported by the β-diketiminate...

Sines J.O., 1984: Relations between the family environment scale and the minnesota multiphasic personality inventory. The relations between FES [Family Environment Scale] scales and MMP [Minnesota Multiple Personality Inventory] scales and the relation of social desirability and endorsement of FES items were studied in a sample of 185 college students. FES scales...

Turkkan J.S.; Harris A.H., 1981: Shaping blood pressure elevations an examination of acquisition. An operant procedure which delivered food when baboons maintained diastolic pressures above a criterion level and which delivered shock when diastolic pressures remained below that level resulted in pressure elevations .apprx. 30 mmHg above restin...

Jull R.K., 1965: Corallum increase in Lithostrotion. "Serial section examination of increase in ten species of Lithostrotion from Australia and Great Britain has shown that increase is a valuable specific character, and has confirmed earlier reports that in Lithostrotion it is mainly lateral; a...

Bielawski, K.; Bielawska, A.; Wołczyński, Sławomir., 2002: Synthesis, DNA-binding activity and cytotoxicity of carbamate derivatives of Hoechst 33258 in breast cancer MCF-7 cells. A series of carbamate derivatives of Hoechst 33258 was prepared as potential anticancer agents. These new compounds (1-4) were readily prepared in good yields by addition of chloroethyl, bromoethyl, chloropropyl or 4-(chloromethyl)phenyl isocyanat...

Carstanjen, B.; Desbois, C.; Hekmati, M.; Behr, L., 2006: Successful engraftment of cultured autologous mesenchymal stem cells in a surgically repaired soft palate defect in an adult horse. The objective of this study was to graft autologous mesenchymal stem cells (MSCs) at the site of surgical repair of a soft palate defect in an adult horse in an attempt to improve wound healing and to investigate whether the transplanted MSCs woul...