globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-015-0083-6
Scopus记录号: 2-s2.0-84939974401
论文题名:
Effects of litter traits, soil biota, and soil chemistry on soil carbon stocks at a common garden with 14 tree species
作者: Mueller K.E.; Hobbie S.E.; Chorover J.; Reich P.B.; Eisenhauer N.; Castellano M.J.; Chadwick O.A.; Dobies T.; Hale C.M.; Jagodziński A.M.; Kałucka I.; Kieliszewska-Rokicka B.; Modrzyński J.; Rożen A.; Skorupski M.; Sobczyk Ł.; Stasińska M.; Trocha L.K.; Weiner J.; Wierzbicka A.; Oleksyn J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期:3
起始页码: 313
结束页码: 327
语种: 英语
英文关键词: Decomposition ; Earthworm ; Lignin ; Litter quality ; Soil organic matter ; Substrate use efficiency
英文摘要: Tree species interact with soil biota to impact soil organic carbon (C) pools, but it is unclear how this interaction is shaped by various ecological factors. We used multiple regression to describe how ~100 variables were related to soil organic C pools in a common garden experiment with 14 temperate tree species. Potential predictor variables included: (i) the abundance, chemical composition, and decomposition rates of leaf litter and fine roots, (ii) species richness and abundance of bacteria, fungi, and invertebrate animals in soil, and (iii) measures of soil acidity and texture. The amount of organic C in the organic horizon and upper 20 cm of mineral soil (i.e. the combined C pool) was strongly negatively correlated with earthworm abundance and strongly positively correlated with the abundance of aluminum, iron, and protons in mineral soils. After accounting for these factors, we identified additional correlations with soil biota and with litter traits. Rates of leaf litter decomposition, measured as litter mass loss, were negatively correlated with size of the combined soil organic C pool. Somewhat paradoxically, the combined soil organic C pool was also negatively related to the ratio of recalcitrant compounds to nitrogen in leaf litter. These apparent effects of litter traits probably arose because two independent components of litter “quality” were controlling different aspects of decomposition. Leaf litter mass loss rates were positively related with leaf litter calcium concentrations, reflecting greater utilization and depolymerization of calcium-rich leaf litter by earthworms and other soil biota, which presumably led to greater proportional losses of litter C as CO2 or dissolved organic C. The fraction of depolymerized and metabolized litter that is ultimately lost as CO2 is an inverse function of microbial C use efficiency, which increases with litter nutrient concentrations but decreases with concentrations of recalcitrant compounds (e.g. lignin); thus, high ratios of recalcitrant compounds to nitrogen in leaf litter likely caused a greater fraction of depolymerized litter to be lost as CO2. Existing conceptual models of soil C stabilization need to reconcile the effects of litter quality on these two potentially counteracting factors: rates of litter depolymerization and microbial C use efficiency. © 2015, US Government.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83520
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, MN, United States; Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ, United States; Department of Forest Resources, University of Minnesota, Saint Paul, MN, United States; Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, NSW, Australia; German Centre for Integrative Biodiversity Research (iDiv) Jena-Halle-Leipzig, Deutscher Platz 5e, Leipzig, Germany; Institute for Biology, University of Leipzig, Johannisallee 21, Leipzig, Germany; Department of Agronomy, Iowa State University, Ames, IA, United States; Department of Geography, University of California, Santa Barbara, CA, United States; Department of Game Management and Forest Protection, Poznań University of Life Sciences, Poznań, Poland; The Natural Resources Research Institute, University of Minnesota Duluth, Duluth, MN, United States; Institute of Dendrology, Polish Academy of Sciences, Kórnik, Poland; Department of Algology and Mycology, University of Łódź, Łódź, Poland; Institute of Environmental Biology, Kazimierz Wielki University, Al. Ossolińskich 12, Bydgoszcz, Poland; Department of Forest Sites and Ecology, Poznań University of Life Sciences, Poznań, Poland; Institute of Environmental Sciences, Jagiellonian University, Kraków, Poland; Department of Botany and Nature Protection, University of Szczecin, Szczecin, Poland

Recommended Citation:
Mueller K.E.,Hobbie S.E.,Chorover J.,et al. Effects of litter traits, soil biota, and soil chemistry on soil carbon stocks at a common garden with 14 tree species[J]. Biogeochemistry,2015-01-01,123(3)
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