caa a22 4500 60621951X CHVBK 20210128101118.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11104-015-2551-0 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2551-0 Effects of UV photodegradation on subsequent microbial decomposition of Bromus diandrus litter [Elektronische Daten] [Yang Lin, Rachel Scarlett, Jennifer King] Aims: Photodegradation acts as a direct contributor to litter decomposition in arid and semi-arid ecosystems. However, its indirect effects are unclear. Does photodegradation condition litter for subsequent microbial decomposition? Methods: We conditioned litter of Bromus diandrus with ambient or reduced ultraviolet (UV) radiation and three periods of exposure (summer, summer-winter, and 1year) in a California annual grassland. We then investigated how field UV exposure affected subsequent microbial decomposition of litter using a controlled laboratory incubation. Results: Surprisingly, microbial decomposition was decreased by UV radiation when the exposure occurred during summer but was unaffected by UV treatment for exposure longer than summer. Litter lignin concentrations did not explain these results, as they were not affected by UV radiation for any of the exposure periods. However, for the summer period exposure, UV radiation was associated with decreased litter N concentration, which corresponded with lowered subsequent microbial activity. Conclusions: Our results suggest a new mechanism through which photodegradation interacts with litter microbial decomposition: photodegradation may decrease microbial decomposition through inhibition of microbial N immobilization. Our results imply that solar radiation can interact with litter N cycling dynamics to influence litter decomposition processes. Springer International Publishing Switzerland, 2015 Photo-oxidation nationallicence Photo-mineralization nationallicence Dryland nationallicence Grass nationallicence Invasive species nationallicence Drought nationallicence Lin Yang Department of Geography, University of California, 93106-4060, Santa Barbara, CA, USA aut Scarlett Rachel Department of Geography, University of California, 93106-4060, Santa Barbara, CA, USA aut King Jennifer Department of Geography, University of California, 93106-4060, Santa Barbara, CA, USA aut Plant and Soil Springer International Publishing 395/1-2(2015-10-01), 263-271 0032-079X 395:1-2<263 2015 395 11104 https://doi.org/10.1007/s11104-015-2551-0 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/s11104-015-2551-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lin Yang Department of Geography, University of California, 93106-4060, Santa Barbara, CA, USA aut NATIONALLICENCE 700 1- Scarlett Rachel Department of Geography, University of California, 93106-4060, Santa Barbara, CA, USA aut NATIONALLICENCE 700 1- King Jennifer Department of Geography, University of California, 93106-4060, Santa Barbara, CA, USA aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 395/1-2(2015-10-01), 263-271 0032-079X 395:1-2<263 2015 395 11104