Ecosystem Productivity and Evapotranspiration Are Tightly Coupled in Loblolly Pine (Pinus taeda L.) Plantations along the Coastal Plain of the Southeastern U.S
| Autor: | John S. King, Kevan J. Minick, Maricar Aguilos, Jean-Christophe Domec, Ge Sun, Michael Gavazzi, Steven G. McNulty, Prajaya Prajapati, Bhaskar Mitra, Asko Noormets |
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| Přispěvatelé: | North Carolina State University [Raleigh] (NC State), University of North Carolina System (UNC), USDA Forest Service Rocky Mountain Forest and Range Experiment Station, United States Department of Agriculture (USDA), Texas A&M University System, Interactions Sol Plante Atmosphère (UMR ISPA), Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Florida International University [Miami] (FIU), Northern Arizona University [Flagstaff] |
| Rok vydání: | 2021 |
| Předmět: |
coastal plain
010504 meteorology & atmospheric sciences Forest management evapotranspiration 0207 environmental engineering Eddy covariance loblolly pine plantation 02 engineering and technology Carbon sequestration 01 natural sciences Carbon cycle Evapotranspiration eddy covariance Ecosystem QK900-989 Water-use efficiency Plant ecology 020701 environmental engineering 0105 earth and related environmental sciences Forestry 15. Life on land carbon and water coupling Productivity (ecology) Agronomy [SDE]Environmental Sciences Environmental science gross primary productivity forested wetland |
| Zdroj: | Forests, Vol 12, Iss 1123, p 1123 (2021) Forests Forests, MDPI, 2021, 12 (8), pp.1-18. ⟨10.3390/f12081123⟩ Volume 12 Issue 8 |
| ISSN: | 1999-4907 |
| DOI: | 10.3390/f12081123 |
| Popis: | Forest water use efficiency (WUE), the ratio of gross primary productivity (GPP) to evapotranspiration (ET), is an important variable to understand the coupling between water and carbon cycles, and to assess resource use, ecosystem resilience, and commodity production. Here, we determined WUE for managed loblolly pine plantations over the course of a rotation on the coastal plain of North Carolina in the eastern U.S. We found that the forest annual GPP, ET, and WUE increased until age ten, which stabilized thereafter. WUE varied annually (2–44%), being higher at young plantation (YP, 3.12 ± 1.20 g C kg−1 H2O d−1) compared to a mature plantation (MP, 2.92 ± 0.45 g C kg−1 H2O d−1), with no distinct seasonal patterns. Stand age was strongly correlated with ET (R2 = 0.71) and GPP (R2 = 0.64). ET and GPP were tightly coupled (R2 = 0.86). Radiation and air temperature significantly affected GPP and ET (R2 = 0.71 − R2 = 0.82) at a monthly scale, but not WUE. Drought affected WUE (R2 = 0.35) more than ET (R2 = 0.25) or GPP (R2 = 0.07). A drought enhanced GPP in MP (19%) and YP (11%), but reduced ET 7% and 19% in MP and YP, respectively, resulting in a higher WUE (27–32%). Minor seasonal and interannual variation in forest WUE of MP (age > 10) suggested that forest functioning became stable as stands matured. We conclude that carbon and water cycles in loblolly pine plantations are tightly coupled, with different characteristics in different ages and hydrologic regimes. A stable WUE suggests that the pine ecosystem productivity can be readily predicted from ET and vice versa. The tradeoffs between water and carbon cycling should be recognized in forest management to achieve multiple ecosystem services (i.e., water supply and carbon sequestration). |
| Databáze: | OpenAIRE |
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