Rodionov, A; Amelung, W; Peinemann, N; Haumaier, L; Zhang, X; Kleber, M; Glaser, B; Urusevskaya, I; Zech, W: Black carbon in grassland ecosystems of the world, Global Biogeochemical Cycles, Vol. 24, GB3013 (2010), doi:10.1029/2009GB003669
Black carbon (BC) is the product of incomplete burning processes and a significant component of the passive soil organic carbon (SOC) pool. The role of BC in the global carbon cycle is still unclear. This study aimed to quantify and characterize BC in major grassland ecosystems of the world. Twenty‐eight representative soil profiles (mainly Mollisols) were sampled in the Russian Steppe, the U.S. Great Plains, the Argentinian Pampa, the Manchurian Plains in China, and the Chernozem region in central Germany. Black carbon contents were estimated using benzene polycarboxylic acids (BPCA) as a molecular marker, and indications about the origin of the BC were derived from bulk and compound‐specific d13C analyses and radiocarbon dating of bulk soil organic matter (SOM). Our findings suggest that between 5% and 30% of SOC stocks consist of BC. Maximum BC contributions to SOC frequently were found at deeper parts of the A horizon with 14C ages younger than 7000 years BP; that is, incorporation of C as charred particles accompanied ecosystem development since the mid‐Holocene. Most of this BC formed from local vegetation, as indicated by a 13C isotope signature similar to that of bulk SOM. At some sites, also nonlocal sources contributed to soil BC, e.g., fossil fuel BC inputs at the German sites. Black carbon stocks were highest in Chernozems and lowest in Kastanozems. The Russian Steppe and Chinese Manchurian sites stored about 3–4 times more BC (around 3 kg m−2) than did the other sites because of thicker A horizons that were rich in BC. On a global scale, we estimate that steppe ecosystems contain between 4 and 17 Pg BC.
Upcoming ...

BayCEER Colloquium:
Th. 2024-06-06
Tracking plant diversity dynamics on islands over thousands of years
Mo. 2024-06-10
Arsenic biogeochemistry from paddy soil to rice grain
Th. 2024-06-13
Seeing the forest beneath the trees: Mycorrhizal fungi as trait integrators of ecosystem processes
Ecological-Botanical Garden:
We. 2024-05-29
Führung | "Grüne Apotheke: Heilpflanzen"
Inaugural Lecture:
We. 2024-05-22
Funktionelle Pilzökologie: Diversität und Prozesse auf unterschiedlichen Skalen
Weather research site
Luftdruck (356m): 963.9 hPa
Lufttemperatur: 22.8 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 8 h/d

This site makes use of cookies More information