TY - JOUR
T1 - Nutrient dynamics during photodegradation of plant litter in the Sonoran Desert
AU - Ball, Rebecca
AU - Christman, Maximilian P.
AU - Hall, Sharon
N1 - Funding Information:
At Arizona State University, Jessica Alvarez Guevara and Jack Ramsey were instrumental in helping with the initial processing of samples. At the Goldwater Environmental Lab, Sara Avery ran all tests on the elemental analyzer and Roy Erickson ran the ICP-OES. The New College of Interdisciplinary Arts and Sciences and Barrett, the Honors College at ASU provided funding for the litter degradation field and laboratory analyses. The thoughtful comments from three reviewers improved this manuscript. This material is based upon work supported by the National Science Foundation under grant number DEB-1026865 for the Central Arizona-Phoenix Long-Term Ecological Research (CAP LTER).
Funding Information:
At Arizona State University, Jessica Alvarez Guevara and Jack Ramsey were instrumental in helping with the initial processing of samples. At the Goldwater Environmental Lab, Sara Avery ran all tests on the elemental analyzer and Roy Erickson ran the ICP-OES. The New College of Interdisciplinary Arts and Sciences and Barrett, the Honors College at ASU provided funding for the litter degradation field and laboratory analyses. The thoughtful comments from three reviewers improved this manuscript. This material is based upon work supported by the National Science Foundation under grant number DEB-1026865 for the Central Arizona-Phoenix Long-Term Ecological Research (CAP LTER).
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/1
Y1 - 2019/1
N2 - Arid and semi-arid ecosystems are experiencing increased rates of atmospheric nitrogen (N) deposition, but the ecological fates of excess nutrients in aridlands are unclear given the few studies conducted in deserts compared to mesic ecosystems. Altered decomposition resulting from increased N availability may not be important in arid ecosystems with significant photodegradation, which may be less influenced by nutrient content than biologically-mediated decomposition. Additionally, nutrient dynamics during decomposition have been studied almost exclusively in mesic ecosystems. To understand the potential impacts of N deposition on mass loss and chemical dynamics during aridland decomposition, we assessed N and phosphorus (P) dynamics of decomposing litter in a long-term N + P enrichment experiment in both urban (+N deposition) and outlying areas (-N deposition) of the Sonoran Desert. Litter was decomposed with and without UV radiation for 9 months, measuring mass loss, litter chemistry, and bacterial biomass. UV radiation significantly accelerated mass loss and altered N and P dynamics, and there was an impact of the urban environment and experimental fertilization on nutrient dynamics. Overall, these patterns suggest that the aridland urban environment, where rates of N deposition are elevated, alters nutrient dynamics during decomposition but not the fraction of litter lost to photodegradation.
AB - Arid and semi-arid ecosystems are experiencing increased rates of atmospheric nitrogen (N) deposition, but the ecological fates of excess nutrients in aridlands are unclear given the few studies conducted in deserts compared to mesic ecosystems. Altered decomposition resulting from increased N availability may not be important in arid ecosystems with significant photodegradation, which may be less influenced by nutrient content than biologically-mediated decomposition. Additionally, nutrient dynamics during decomposition have been studied almost exclusively in mesic ecosystems. To understand the potential impacts of N deposition on mass loss and chemical dynamics during aridland decomposition, we assessed N and phosphorus (P) dynamics of decomposing litter in a long-term N + P enrichment experiment in both urban (+N deposition) and outlying areas (-N deposition) of the Sonoran Desert. Litter was decomposed with and without UV radiation for 9 months, measuring mass loss, litter chemistry, and bacterial biomass. UV radiation significantly accelerated mass loss and altered N and P dynamics, and there was an impact of the urban environment and experimental fertilization on nutrient dynamics. Overall, these patterns suggest that the aridland urban environment, where rates of N deposition are elevated, alters nutrient dynamics during decomposition but not the fraction of litter lost to photodegradation.
KW - Ambrosia deltoidea
KW - Decomposition
KW - N deposition
KW - Nutrient dynamics
KW - Photodegradation
KW - Sonoran desert
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U2 - 10.1016/j.jaridenv.2018.09.004
DO - 10.1016/j.jaridenv.2018.09.004
M3 - Article
AN - SCOPUS:85053826910
SN - 0140-1963
VL - 160
SP - 1
EP - 10
JO - Journal of Arid Environments
JF - Journal of Arid Environments
ER -