Microbial carbon use efficiency in grassland soils subjected to nitrogen and phosphorus additions

被引:90
作者
Widdig, Meike [1 ]
Schleuss, Per-M. [1 ]
Biederman, Lori A. [2 ]
Borer, Elizabeth T. [3 ]
Crawley, Michael J. [4 ]
Kirkman, Kevin P. [5 ]
Seabloom, Eric W. [3 ]
Wragg, Peter D. [6 ]
Spohn, Marie [1 ]
机构
[1] Univ Bayreuth, Dept Soil Biogeochem & Soil Ecol, Bayreuth, Germany
[2] Iowa State Univ, Dept Ecol Evolut & Organismal Biol, Ames, IA USA
[3] Univ Minnesota, Dept Ecol Evolut & Behav, Minneapolis, MN 55455 USA
[4] Imperial Coll London, Dept Life Sci, London, England
[5] Univ KwaZulu Natal, Sch Life Sci, Durban, South Africa
[6] Univ Minnesota, Dept Forest Resources, Minneapolis, MN 55455 USA
基金
美国国家科学基金会;
关键词
Carbon mineralization; Microbial respiration; Nutrient fertilization; Microbial growth efficiency; Nutrient network (NutNet); Microbial growth; BACTERIAL-GROWTH EFFICIENCY; INTERGENIC SPACER ANALYSIS; LONG-TERM NITROGEN; ORGANIC-MATTER; EXTRACTION METHOD; STOICHIOMETRIC CONTROLS; FUMIGATION-EXTRACTION; INORGANIC NITROGEN; BIOMASS TURNOVER; GLOBAL ANALYSIS;
D O I
10.1016/j.soilbio.2020.107815
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Soil microbial carbon use efficiency (CUE), defined as the ratio between carbon (C) allocated to growth and C taken up by microorganisms, is pivotal for the understanding of C cycling in terrestrial ecosystems. Soil microbial CUE is thought to increase under nitrogen (N) addition, thereby mediating the effects of atmospheric N deposition on C cycling in soils. We studied the effects of N, phosphorus (P), and combined N and P addition on soil microbial CUE from a total of six grassland soils from South Africa, USA, and UK. Microbial CUE varied between 25 and 57% with a mean value of 40% across all sites, depth increments, and treatments. Most of the site variability in microbial CUE was explained by sand content, mean annual precipitation and temperature, and the dissolved organic C:dissolved N ratio. Soil microbial CUE as well as microbial biomass turnover time were robust to changes in N, P, and NP supply. However, N addition significantly reduced microbial respiration and C uptake in the topsoil. Taken together, N, P, and NP addition did not influence microbial CUE and biomass turnover time in grassland soils on different continents, indicating that microbial CUE varies little despite large changes in element inputs. Consequently, increased N inputs to soil may have a smaller impact on microbial CUE and biomass turnover time, and therefore C cycling in grassland soils, than expected and models assuming increased CUE with increasing N inputs could overestimate future C storage.
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页数:13
相关论文
共 104 条
[1]   Combining theory and experiment to understand effects of inorganic nitrogen on litter decomposition [J].
Ågren, GI ;
Bosatta, E ;
Magill, AH .
OECOLOGIA, 2001, 128 (01) :94-98
[2]   Rapid method of determining factors limiting bacterial growth in soil [J].
Aldén, L ;
Demoling, F ;
Bååth, E .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 2001, 67 (04) :1830-1838
[3]   Soil-carbon response to warming dependent on microbial physiology [J].
Allison, Steven D. ;
Wallenstein, Matthew D. ;
Bradford, Mark A. .
NATURE GEOSCIENCE, 2010, 3 (05) :336-340
[4]   DNA determinations during growth of soil microbial biomasses [J].
Anderson, Traute-Heidi ;
Martens, Rainer .
SOIL BIOLOGY & BIOCHEMISTRY, 2013, 57 :487-495
[5]  
[Anonymous], J GEOPHYS RES
[6]  
[Anonymous], 2018, Arm: Data Analysis Using Regression and Multilevel/ Hierarchical Models
[7]  
[Anonymous], Z PFLANZENERNAHRU 11
[8]  
[Anonymous], GLOBAL CHANGE BIOL
[9]   Dynamics of 18O Incorporation from H 2 18 O into Soil Microbial DNA [J].
Blazewicz, Steven J. ;
Schwartz, Egbert .
MICROBIAL ECOLOGY, 2011, 61 (04) :911-916
[10]   Finding generality in ecology: a model for globally distributed experiments [J].
Borer, Elizabeth T. ;
Harpole, W. Stanley ;
Adler, Peter B. ;
Lind, Eric M. ;
Orrock, John L. ;
Seabloom, Eric W. ;
Smith, Melinda D. .
METHODS IN ECOLOGY AND EVOLUTION, 2014, 5 (01) :65-+