HLTH-3: October 2000 Progress Report

How have abiotic factors including environmental stressors such as air pollution influenced the overall health of the South's forests and what are future effects likely to be?

Jennifer Moore

October 11-12, 2000, Atlanta, GA

Acid Deposition (vegetation, hydrology, soil, soil microorganisms)

Progress:

Estimate areas of timberland/forest area by forest type

Current and/or historical estimates of N & S deposition; future predictions of N deposition

Detection and evaluation of forest types at greatest risk of negative impacts of acid deposition (e.g., leaching of base cations, lack of microbial activity, etc.)

Status of surface water acid-base chemistry and response to acid deposition

 Issues:

Must separate vegetation response into spruce-fir (Southern Appalachians) and pine/pine & hardwood forest types

Ozone

Progress:

Current and predicted future estimates of O3 concentrations

Review of FHM bioindicator database in progress

Quantified reduction in net primary productivity resulting from increased O3concentrations

Rank forest types by severity of risk/susceptibility to O3 impacts

Issues:

Difficult to integrate O3 exposure data with other sources (exists as points, not continuous surface)

Climate Change

Progress:

Results from forest ecosystem models for current and future estimates of net primary productivity under varying climate scenarios

Linkage between temperature and/or precipitation change and extreme weather events; info in form of average impact (acres), average forest economic cost

Linkage between increased CO2 and increased O3

Issues:

Weather event info summarized at national level

Carbon Sequestration

Progress:

Use models to understand and estimate C storage under different land-use scenarios

Include potential to improve C storage through changed management practices: (e.g., low/no till, converting marginal grasslands to plantations, agroforestry)

Address C storage and loss in forest products

Issues:

Incomplete understanding of C storage patterns and processes

Most C sequestration research is restricted to local areas

Remaining questions include differences across land covers (past and current) and soil types, estimating (current and) future state of C sinks

Soil Compaction, Erosion, Nutrient Status

Progress:

Collection of soil compaction research from Bob Rummer et al.

Issues:

Limited amount of research at the regional level

 

 

 

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 modified: 17-Oct-2000