TY  - GEN
A1  - Manzoni, Stefano
A1  - Čapek, Petr
A1  - Porada, Philipp
A1  - Thurner, Martin
A1  - Winterdahl, Mattias
A1  - Beer, Christian
A1  - Brüchert, Volker
A1  - Frouz, Jan
A1  - Herrmann, Anke M.
A1  - Lindahl, Björn D.
A1  - Lyon, Steve W.
A1  - Šantrůčková, Hana
A1  - Vico, Giulia
A1  - Way, Danielle
T1  - Reviews and syntheses
BT  - carbon use efficiency from organisms to ecosystems – definitions, theories, and empirical evidence
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The cycling of carbon (C) between the Earth surface and the atmosphere is controlled by biological and abiotic processes that regulate C storage in biogeochemical compartments and release to the atmosphere. This partitioning is quantified using various forms of C-use efficiency (CUE) - the ratio of C remaining in a system to C entering that system. Biological CUE is the fraction of C taken up allocated to biosynthesis. In soils and sediments, C storage depends also on abiotic processes, so the term C-storage efficiency (CSE) can be used. Here we first review and reconcile CUE and CSE definitions proposed for autotrophic and heterotrophic organisms and communities, food webs, whole ecosystems and watersheds, and soils and sediments using a common mathematical framework. Second, we identify general CUE patterns; for example, the actual CUE increases with improving growth conditions, and apparent CUE decreases with increasing turnover. We then synthesize > 5000CUE estimates showing that CUE decreases with increasing biological and ecological organization - from uni-cellular to multicellular organisms and from individuals to ecosystems. We conclude that CUE is an emergent property of coupled biological-abiotic systems, and it should be regarded as a flexible and scale-dependent index of the capacity of a given system to effectively retain C.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1134 
KW  - gross primary production
KW  - net primary production
KW  - plant respiration
KW  - microbial carbon
KW  - stoichiometric controls
KW  - growth efficiency
KW  - bacterial growth
KW  - excess carbon
KW  - soil
KW  - matter
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-446386
SN  - 1866-8372
IS  - 1134
ER  - 
TY  - GEN
A1  - Hargis, Hailey
A1  - Gotsch, Sybil G.
A1  - Porada, Philipp
A1  - Moore, Georgianne W.
A1  - Ferguson, Briana
A1  - Van Stan II, John T.
T1  - Arboreal epiphytes in the soil-atmosphere interface
BT  - how often are the biggest “buckets” in the canopy empty?
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Arboreal epiphytes (plants residing in forest canopies) are present across all major climate zones and play important roles in forest biogeochemistry. The substantial water storage capacity per unit area of the epiphyte “bucket” is a key attribute underlying their capability to influence forest hydrological processes and their related mass and energy flows. It is commonly assumed that the epiphyte bucket remains saturated, or near-saturated, most of the time; thus, epiphytes (particularly vascular epiphytes) can store little precipitation, limiting their impact on the forest canopy water budget. We present evidence that contradicts this common assumption from (i) an examination of past research; (ii) new datasets on vascular epiphyte and epi-soil water relations at a tropical montane cloud forest (Monteverde, Costa Rica); and (iii) a global evaluation of non-vascular epiphyte saturation state using a process-based vegetation model, LiBry. All analyses found that the external and internal water storage capacity of epiphyte communities is highly dynamic and frequently available to intercept precipitation. Globally, non-vascular epiphytes spend <20% of their time near saturation and regionally, including the humid tropics, model results found that non-vascular epiphytes spend ~1/3 of their time in the dry state (0–10% of water storage capacity). Even data from Costa Rican cloud forest sites found the epiphyte community was saturated only 1/3 of the time and that internal leaf water storage was temporally dynamic enough to aid in precipitation interception. Analysis of the epi-soils associated with epiphytes further revealed the extent to which the epiphyte bucket emptied—as even the canopy soils were often <50% saturated (29–53% of all days observed). Results clearly show that the epiphyte bucket is more dynamic than currently assumed, meriting further research on epiphyte roles in precipitation interception, redistribution to the surface and chemical composition of “net” precipitation waters reaching the surface.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 928 
KW  - precipitation
KW  - interception
KW  - bromeliad
KW  - vascular epiphyte
KW  - non-vascular epiphyte
KW  - lichens
KW  - bryophytes
KW  - water storage capacity
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-441993
SN  - 1866-8372
IS  - 928
ER  -