TREE STRATUM ALTERATION DECREASES C USE EFFICIENCY AND THE STABILITY OF LITTER DECOMPOSITION IN A SACRED FIR (ABIES RELIGIOSA) FOREST
Por:
Choreno-Parra, Eduardo M., Angeles-Perez, Gregorio, Villegas-Rios, Margarita, Beltran-Paz, Ofelia, Perez-Pazos, Eduardo, Quintero-Gradilla, Shatya, Chavez-Vergara, Bruno
Publicada:
1 oct 2022
Ahead of Print:
1 jun 2022
Categoría:
Plant science
Resumen:
Background: There is limited information to predict the direction in
which canopy modification affects the microbial carbon use efficiency
(CUE) and, consequently, the magnitude and stability of litter
decomposition in monodominant sacred fir (Abies religiosa) forests.
Questions: What is the effect of tree stratum alteration on CUE and
stability of litter decomposition in an A. religiosa forest?
Study sites and dates: Two conditions inside a sacred fir forest were
selected: A) a naturally monodominant homogeneous condition, and B) a
heterogeneous condition with a non-monospecific tree stratum derived
from local disturbances (wildfire and reforestation) occurred on a
single occasion 18 years ago.
Methods: In each condition (homogeneous and heterogeneous), the
Importance Value Index (IVI) was calculated in the tree stratum, while
chemical composition, microbial carbon (C) concentration, enzyme
activities and C mineralization were measured in litter samples. The
specific enzymatic activity and the metabolic quotient were calculated
as CUE indicators, and the coefficient of variation as a proxy for
litter decomposition stability.
Results: A change in tree species composition and an increase in tree
species richness in the heterogeneous condition was found, which
decreased litter phosphorous (P) concentration. This promoted a high
microbial activity and low CUE, favoring C mineralization. Furthermore,
low stability during litter decomposition was observed as tree species
richness increased.
Conclusions: Tree stratum heterogeneity, as a consequence of past
disturbances, decreases CUE and the stability of litter decomposition in
an A. religiosa forest.
Filiaciones:
Choreno-Parra, Eduardo M.:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Biol, Mexico City, DF, Mexico
Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA
Angeles-Perez, Gregorio:
Colegio Postgrad Campus Montecillo, Texcoco, Estado de Mexic, Mexico
Villegas-Rios, Margarita:
Univ Nacl Autonoma Mexico, Fac Ciencias, Mexico City, DF, Mexico
Beltran-Paz, Ofelia:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City, DF, Mexico
Univ Nacl Autonoma Mexico, Lab Nacl Geoquim & Mineral, Mexico City, DF, Mexico
Perez-Pazos, Eduardo:
Univ Nacl Autonoma Mexico, Fac Ciencias, Mexico City, DF, Mexico
Quintero-Gradilla, Shatya:
Univ Guadalajara, Ctr Univ Costa Sur, Autlan de Navarro, Jalisco, Mexico
Chavez-Vergara, Bruno:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City, DF, Mexico
Univ Nacl Autonoma Mexico, Lab Nacl Geoquim & Mineral, Mexico City, DF, Mexico
gold
|