Geophysical Resea ch Abs ac s
Vol. 20, EGU2018-14022-1, 2018
EGU Gene al Assembly 2018
© Au ho (s) 2018. CC A ibu ion 4.0 license.
Ni ogen addi ion d i es decomposi ion a es in Medi e anean
ecosys ems ia changes in soil p ope ies and mic obial a ibu es
Lou des Mo illas (1), Mau o LoCascio (2), Raul Ochoa Hueso (3), Ja ie Roales (4), Manuel Delgado-Baque izo
(5), Sil ana Munzi (6), Te esa Dias (7), Es eban Man ique (8), Es he Pe ez Co ona (9), An onio Galla do (10),
C is ina C uz (11), Dona ella Spano (12), and Simone Me eu (13)
(1) Uni e si y o Sassa i, Depa men o Science o Na u e and En i onmen al Resou ces (DipNET), Sassa i, I aly
([email p o ec ed]), (2) Uni e si y o Sassa i, Depa men o Science o Na u e and En i onmen al Resou ces
(DipNET), Sassa i, I aly ([email p o ec ed]), (3) Au onomous Uni e si y o Mad id, Depa men o ecology, Mad id,
Spain ( .ochoahueso@wes e nsydney.edu.au), (4) Pablo de Ola ide Uni e si y, Depa men o Physical, Chemical and Na u al
Sys ems, Se ille, Spain (ja ie [email p o ec ed]), (5) Uni e si y o Colo ado Boulde ,Coope a i e Ins i u e o Resea ch in
En i onmen al Sciences (CIRES), Boulde , USA (m.delgadobaque izo@wes e nsydney.edu.au), (6) Cen e o Ecology,
Uni e si y o Lisbon, E olu ion and En i onmen al Changes (cE3c), Lisbon, Po ugal ([email p o ec ed]), (7) Cen e o
Ecology, Uni e si y o Lisbon, E olu ion and En i onmen al Changes (cE3c), Lisbon, Po ugal ([email p o ec ed]), (8) Spanish
Na ional Resea ch Council (MNCN-CSIC), Na ional Museum o Na u al Sciences, Depa men Biogeog aphy and Global
Change, Mad id, Spain ([email p o ec ed]), (9) Complu ense Uni e si y o Mad id, Depa men o Ecology, Mad id, Spain
([email p o ec ed]), (10) Pablo de Ola ide Uni e si y, Depa men o Physical, Chemical and Na u al Sys ems, Se ille, Spain
([email p o ec ed]), (11) Cen e o Ecology, Uni e si y o Lisbon, E olu ion and En i onmen al Changes (cE3c), Lisbon,
Po ugal ([email p o ec ed]), (12) Uni e si y o Sassa i, Depa men o Science o Na u e and En i onmen al Resou ces
(DipNET), Sassa i, I aly ([email p o ec ed]), (13) Eu o-Medi e anean Cen e on Clima e Change (CMCC), IAFES Di ision,
Sassa i, I aly ([email p o ec ed])
Al hough an h opogenic ni ogen (N) deposi ion has been iden i ied as a majo h ea o biodi e si y and ecosys em
unc ioning in Medi e anean en i onmen s, li le is known on he ole o soil p ope ies and mic obial a ibu es
in media ing he esponse o soil o ganic ma e (SOM) decomposi ion o N inpu s. He e, we used S uc u al
Equa ion Modeling (SEM) o e alua e he di ec and indi ec e ec s o N inpu s on SOM decomposi ion a es
ac oss di e en N loads and h ee Medi e anean semi-a id ecosys ems. Ou SEM showed ha soil ammonium
a ailabili y dec eases soil pH leading o a educ ion o he ungi/bac e ia a io and o an inc ease in soil enzyma ic
ac i i y, whe eas i also has a nega i e di ec and mayo e ec on soil decomposi ion a e. This inc ease in soil
enzyma ic ac i i y, which was condi ioned no only by soil pH bu also by he ungi/bac e ia a io and ino ganic
N con en , had a posi i e di ec e ec on he soil decomposi ion a e. Toge he , ou esul s sugges ha changes
in soil p ope ies and mic obial a ibu es linked o N addi ions can a ec he SOM decomposi ion a es ac oss
h ee egions om he Medi e anean Basin. These indings imp o e ou unde s anding o he links be ween soil
chemical p ope ies, mic obial communi ies and unc ion in Medi e anean ecosys ems, especially in he con ex
o an h opogenic N en ichmen .