Stand age, disturbance history and the temporal stability of forest production

FOREST ECOLOGY AND MANAGEMENT

卷:460

Article

Wales, Shea B.¹  Kreider, Mark R.²  Atkins, Jeff¹  Hulshof, Catherine M.¹  Fahey, Robert T.^3,4  Nave, Lucas E.^5,6  Nadelhoffer, Knute J.^5,6  Gough, Christopher M.¹ 

[1] Virginia Commonwealth Univ, Dept Biol, Box 842012,1000 West Cary St, Richmond, VA 23284 USA

[2] Utah State Univ, Wildland Resources Dept, Logan, UT 84322 USA

[3] Univ Connecticut, Dept Nat Resources & Environm, 1376 Storrs Rd, Storrs, CT 06269 USA

[4] Univ Connecticut, Ctr Environm Sci & Engn, 1376 Storrs Rd, Storrs, CT 06269 USA

[5] Univ Michigan, Biol Stn, Pellston, MI 49769 USA

[6] Univ Michigan, Dept Ecol & Evolutionary Biol, Pellston, MI 49769 USA

关键词: Net primary production;    Stability;    Structure;    Complexity;    Diversity;    Late successional;    Leaf morphology;    Leaf physiology;    Leaf mass area;    Fluorescence;    Succession;    Disturbance;    Clearcut;    Fire;   

DOI  :  10.1016/j.foreco.2020.117865

来源: Elsevier

【 摘 要 】

Sustaining the terrestrial carbon (C) sink requires knowledge of the forest properties supporting stable production under increasingly variable climate conditions. We examined how stand disturbance history and age, structural complexity and species diversity, and leaf properties relate to the 10-yr stability of above-ground wood net primary production (NPPw) in northern temperate forests of Michigan, USA. Our investigation centered on separate deciduous, evergreen, and mixed late successional stands initiated over a century ago and free of recent disturbance, a Cut Only chronosequence established following clearcut harvesting, and a Cut and Burn chronosequence that regenerated following experimental clearcut harvesting and fire. The temporal stability of stand production was calculated from the 10-yr coefficient of variation (CV) of annual NPPw estimated from tree cores; canopy rugosity, a measure of structural complexity, was estimated using terrestrial LiDAR; and > 1500 subcanopy leaves were sampled for leaf mass area and chlorophyll fluorescence intensity. The temporal stability of stands differed by > 2-fold, from 5% to 11% CV of NPPw. Counter to expectations, we found that NPPw stability was greatest in the more severely disturbed Cut and Burn stands and lowest in late successional stands. Despite similar successional patterns of species diversity and structural complexity, NPPw stability increased in Cut Only stands and declined in Cut and Burn stands as age, diversity and canopy rugosity increased. The NPPw of more diverse, late successional deciduous forests was more temporally stable than that of evergreen forests. We conclude that management for maximal rates of production may not confer temporal stability, indicating future studies are needed to elucidate the stand and canopy properties that support both high production rates and stability.

【 授权许可】

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