caa a22 4500 605516758 CHVBK 20210128100715.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10533-014-0027-6 doi (NATIONALLICENCE)springer-10.1007/s10533-014-0027-6 The soil matrix increases microbial C stabilization in temperate and tropical forest soils [Elektronische Daten] [Heather Throckmorton, Jeffrey Bird, Nick Monte, Tad Doane, Mary Firestone, William Horwath] Microbial biomass represents a substantial source of labile C contributing to soil organic matter (SOM) maintenance. Microbial residues may associate with the soil matrix through a variety of mechanisms, reducing its bioavailability and increasing its persistence in soil. Our objective was to examine soil matrix effects on the stability of non-living microbial C inputs in two contrasting forest ecosystems by following microbial residues (Fungi, Actinobacteria, Gram-positive bacteria (Gm +), Gram-negative bacteria (Gm −)) into SOM fractions in a temperate forest in California (CA) and a tropical forest in Puerto Rico (PR) for 3 and 2 years, respectively. We isolated 3 SOM fractions: (i) free light fraction (FLF), (ii) occluded light fraction (OLF), and (iii) dense fraction (DF). Additionally, we characterized SOM fraction chemistry to infer quality and source of native fraction SOM. Our results showed greater stabilization as mineral-associated microbial C (i.e., as DF and OLF), compared with loose detrital C (i.e., FLF). There was no microbial group effect (i.e., differences in fraction C recovery among different microbial cell types). Our findings suggest that mineral association is more important for stabilizing non-living microbial C in soil than the cellular structure of the initial source of microbial inputs, with site specific edaphic factors as the major controllers of the amount of microbial residues stabilized. Springer International Publishing Switzerland, 2014 Microorganisms nationallicence Fungi nationallicence Bacteria nationallicence Carbon nationallicence Soil organic matter nationallicence Mineral protection nationallicence Stabilization nationallicence Throckmorton Heather Los Alamos National Lab, MS 495, 87545, Los Alamos, NM, USA aut Bird Jeffrey Queens College CUNY, 65-30 Kissena Blvd., 11367, Flushing, NY, USA aut Monte Nick University of California, One Shields Ave., 95616, Davis, CA, USA aut Doane Tad University of California, One Shields Ave., 95616, Davis, CA, USA aut Firestone Mary University of California, 137 Mulford Hall, Berkeley, 94720, Berkeley, CA, USA aut Horwath William University of California, One Shields Ave., 95616, Davis, CA, USA aut Biogeochemistry Springer International Publishing 122/1(2015-01-01), 35-45 0168-2563 122:1<35 2015 122 10533 https://doi.org/10.1007/s10533-014-0027-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-014-0027-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Throckmorton Heather Los Alamos National Lab, MS 495, 87545, Los Alamos, NM, USA aut NATIONALLICENCE 700 1- Bird Jeffrey Queens College CUNY, 65-30 Kissena Blvd., 11367, Flushing, NY, USA aut NATIONALLICENCE 700 1- Monte Nick University of California, One Shields Ave., 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Doane Tad University of California, One Shields Ave., 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Firestone Mary University of California, 137 Mulford Hall, Berkeley, 94720, Berkeley, CA, USA aut NATIONALLICENCE 700 1- Horwath William University of California, One Shields Ave., 95616, Davis, CA, USA aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 122/1(2015-01-01), 35-45 0168-2563 122:1<35 2015 122 10533