• Non ci sono risultati.

Different pathways but same result? Comparing chemistry and biological effects of burned and decomposed litter

N/A
N/A
Protected

Academic year: 2021

Condividi "Different pathways but same result? Comparing chemistry and biological effects of burned and decomposed litter"

Copied!
1
0
0

Testo completo

(1)

Geophysical Research Abstracts Vol. 19, EGU2017-15234, 2017 EGU General Assembly 2017

© Author(s) 2017. CC Attribution 3.0 License.

Different pathways but same result? Comparing chemistry and biological

effects of burned and decomposed litter

Stefano Mazzoleni (1), Giuliano Bonanomi (1), Guido Incerti (2), Ahmed M. Abd El-Gawad (3), Tushar Chandra Sarker (1), Gaspare Cesarano (1), Luigi Saulino (1), Antonio Saracino (1), and Francisco Castro Rego (4)

(1) Dipartimento di Agraria, Università di Napoli Federico II, Portici, Italy (stefano.mazzoleni@unina.it), (2) Dipartimento di Scienze Agroalimentari Ambientali e Animali, Università di Udine, Udine, Italy, (3) Department of Botany, Mansoura University, Al Dakahllia, Egypt, (4) CEABN Instituto Superior de Agronomia, Universidade de Lisboa, Lisboa, Portugal

Litter burning and biological decomposition are oxidative processes co-occurring in many terrestrial ecosystems, producing organic matter with different chemical properties and differently affecting plant growth and soil micro-bial activity. Here, we tested the chemical convergence hypothesis (i.e. materials with different initial chemistry tend to converge towards a common profile, with similar biological effects, as the oxidative process advances) for burning and decomposition. We compared the molecular composition of 63 organic materials - 7 litter types either fresh, decomposed for 30, 90, 180 days, or heated at 100, 200, 300, 400, 500◦C - as assessed by 13C NMR. We used litter water extracts (5% dw) as treatments in bioassays on plant (Lepidium sativum) and fungal (Aspergillus niger) growth, and a washed quartz sand amended with litter materials (0.5 % dw) to assess heterotrophic respi-ration by CO2flux chamber. We observed different molecular variations for materials either burning (i.e. a sharp

increase of aromatic C and a decrease of most other fractions above 200◦C) or decomposing (i.e. early increase of alkyl, methoxyl and N-alkyl C and decrease of O-alkyl and di-O-alkyl C fractions). Soil respiration and fungal growth progressively decreased with litter age and temperature. Plant growth underwent an inhibitory effect by untreated litter, more and less rapidly released over decomposing and burning materials, respectively. Correlation analysis between NMR and bioassay data showed that opposite responses for soil respiration and fungi, compared to plants, are related to essentially the same C molecular types. Our findings suggest a functional convergence of decomposed and burnt organic substrates, emerging from the balance between the bioavailability of labile C sources and the presence of recalcitrant and pyrogenic compounds, oppositely affecting different trophic levels.

Riferimenti

Documenti correlati

Phragmites australis ([Cav] Trin ex Steud.) decay rates were studied, searching for abiotic indirect drivers of plant detritus decomposition in transitional waters, even

From the French Revolution onwards, Europe had followed a road that was leading to suicide: for this reason, Maistre wrote in 1819 with an emphasis as tragic as it was sarcastic,

[r]

ce provare a inizio stagione, quan- do nel giro di due ore di marcia si possono fondere i colori verdissimi del bosco di latifoglie che accom- pagnano la salita e il bianco delle

(CF) A 5 × 13 mixed design ANCOVA with the between factor Stimulation (5 levels: P3 - 3 mA offline AtDCS, P3 - 3 mA online AtDCS, P3 - 1.5 mA offline AtDCS, P3 - 1.5 mA online

The study assessed the efficacy of autologous plasma rich in growth factors (PRGF) in the healing process by checking the difference of tissue cyto- kines and other healing

La maggior parte delle letture del film intende in effetti che essi rinunciano a vivere la loro storia d’amore a causa di una convenzionale morale degli altri: il testo li

• Algoritmo di stima dell’assetto e posizione, quest’ultimo blocco è il sistema vero e proprio che, prese le distanze calcolate dai vari sensori (nel nostro caso sono

Globalizing the student rebellion in the long ’68 ISBN: 978-84-948270-3-7 officially written, the unwritten and the Null curriculum history.. Then, the comprehension of history as

Principal component analysis of 13 C NMR spectral signals recorded in 36 litter types (i.e. fresh and decomposed leaf materials from 18 plant species) in relation to growth

L’originalità della produzione di Anna Negri, applicata all’adattamento-transduzione del romanzo attraverso la sceneggiatura, consiste nel cercare di pensare alla

Una singola somministrazione in- traarticolare di clodronato in pazienti con artrite reumatoide induce una significativa riduzione nu- merica dei macrofagi del lining sinoviale

Interestingly, compared with sham mice, western blot analysis of the myocardium from mice with CKD revealed profound increases in phosphorylation of I κ B α ,

A detailed analysis of the residues involved in H-bonds with water molecules pointed out that the residues in positions 1, 3 and 7 (Y, E and E in PepE and Y, E and K

Polin del Dipartimento di Matematica dell'Università di Torino presso cui ha svolto varia attività di disseminazione e sviluppo di nuove tecnologie per il supporto a persone

Table 1 shows shared clin- ical practice for PT from an analysis of seven national surveys performed in France (where 152 intensive care units participated in the survey),

Senza dubbio è stato in seguito agli intensi anni di attività di Banlieue ’89, che la questione della riabilitazione dei grands ensembles è divenuta sempre più centrale

The application of undecomposed plant litter showed a higher root damage compared to decomposed materials (Figure 5.1.4a).. Overall, all undecomposed litter caused a significant

Questo scenario parte dal presupposto che l’attuale situazione di crisi socio-economica lascerà la sua traccia indelebile nei prossimi anni e renderà necessario un

Nello stesso anno Maria Antonietta Visceglia in Il bisogno dell’eternità ha studiato i comportamenti aristocratici a Napoli rispetto, anche in quel caso, al ruolo e alla

It is noteworthy that in our study both anti-VEGF agents, in addition to preventing the fall of cell viability and mitochondrial membrane potential, were also able to counteract the