Presentaci

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CARBON STOCKS AND FLUXES IN
TEMPERATE FORESTS OF NUEVO LEON, MEXICO
José de Jesús Návar Cháidez (BSc. For, M.Sc. For,
Ph.D, Env. Sci.) IPN-CIIDIR Durango. Sigma s/n.
Fracc. 20 de Noviembre II. Durango, Dgo. 34220.
Tel [phone]). EMail jnavar_at_ipn.mx
OBJECTIVES
INTRODUCTION
ESTIMATES OF CARBON STOCKS AND FLUXES HAVE BEEN
CONDUCTED WORLDWIDE FOR SEVERAL FORESTS AT
SEVERAL SPATIAL SCALES. HOWEVER, INFORMATION FOR
MEXICAN FORESTS ARE SCARCE. UPDATED STATISTICS
CALCULATED WITH DATA DERIVED FROM THE NEW MEXICAN
FOREST INVENTORY ARE IMPORTANT PIECES OF
INFORMATION FOR THE SUSTAINABLE MANAGEMENT OF
FOREST ECOSYSTEMS OF THE STATE OF NUEVO LEON,
MEXICO.
i) TO ESTIMATE CARBON STOCKS AND FLUXES AND ii)
TO RELATE THEM TO TREE DIVERSITY AND STRUCTURAL
COMPLEXITY IN TEMPERATE FOREST ECOSYSTEMS OF
NUEVO LEON, MEXICO.
METODOLOGY
STATISTICAL ANALYSIS ON DASOMETRIC DATA OF 63
SAMPLING SITES WERE MEASURED WITHIN THE FRAMEWORK
OF THE MEXICAN FOREST INVENTORY (2004-2006) IN
TEMPERATE FOREST ECOSYTEMS OF THE STATE OF NUEVO
LEON, MEXICO. CARBON STOCKS AND FLUXES WERE
ESTIMATED WITH THE USE OF ALLOMETRIC EQUATIONS
AND CARBON EXPANSION FACTORS, AND WITH THE
CURRENT ANNUAL INCREMENT. TREE DIVERSITY AND
STRUCTURAL COMPLEXITY WERE PARAMETRIZED USING
SEVERAL INDICES. REGRESSION ANALYSIS PROVIDED
INFORMATION ON HOW TREE DIVERSITY AND STRUCTURAL
COMPLEXITY CONTROL ABOVEGROUND PRODUCTIVITY.
RESULTS
RESULTS INDICATED THAT TEMPERATE FORESTS OF THE
STATE OF NUEVO LEON, MEXICO ARE IN A JUVENILE
STATE WITH DIAMETER DISTRIBUTIONS SKEWED TO THE
RIGHT, WITH LOW TREE DENSITY, LOW DENSITIES OF
STANDING VOLUME, AND SMALL BIOMASS AND CARBON
STOCKS. MEAN (CONFIDENCE INTERVAL) CARBON STOCKS
IN ABOVEGROUND BIOMASS ARE 37 Mg ha-1 ( 6 Mg
ha-1). TREE PRODUCTIVITY IS ALSO SMALL SINCE IT
DOES NOT SURPASS ON THE AVERAGE 0.36 m3 Y-1. TREE
DIVERSITY AT THE SITE SCALE IS ALSO SMALL SINCE
LESS THAN 4 SPECIES ARE FOUND IN THESE FORESTS.
THERE WAS STATISTICAL EVIDENCE THAT PRODUCTIVITY
IS RELATED TO TREE DIVERSITY AND STRUCTURAL
COMPLEXITY IN A POSITIVE AND LINEAR FASHION.
THESE OBSERVATIONS PROVIDE INSIGTHS INTO THE
FORESTRY ACTIVITIES THAT MUST BE RECOMMENDED FOR
THE TEMPERATE FORESTS OF THE STATE OF NUEVO LEON,
MEXICO. SILVICULTURAL PRESCRIPTIONS MUST AIM, BY
MANAGING FORESTS IN THE MIDDLE RUN FOR GOODS AT A
LIGHT RATE, AT INCREASING STAND TREE DIVERSITY
AND STRUCTURAL COMPLEXITY SINCE THESE VARIABLES
CONTROL STAND PRODUCTIVITY. ENHANCED SERVICES
THAT CAN BE OBTAINED IN THE LONG RUN FROM THESE
ECOSYSTEMS MUST BE AN IMPORTANT SOURCE OF INCOME
FOR FOREST LANDOWNERS.