Ecosystem Productivity and Evapotranspiration Are Tightly Coupled in Loblolly Pine (Pinus taeda L.) Plantations along the Coastal Plain of the Southeastern U.S.
نویسندگان
چکیده
Forest water use efficiency (WUE), the ratio of gross primary productivity (GPP) to evapotranspiration (ET), is an important variable understand coupling between and carbon cycles, assess resource use, ecosystem resilience, commodity production. Here, we determined WUE for managed loblolly pine plantations over course a rotation on coastal plain North Carolina in eastern U.S. We found that forest annual GPP, ET, increased until age ten, which stabilized thereafter. varied annually (2–44%), being higher at young plantation (YP, 3.12 ± 1.20 g C kg?1 H2O d?1) compared mature (MP, 2.92 0.45 d?1), with no distinct seasonal patterns. Stand was strongly correlated ET (R2 = 0.71) GPP 0.64). were tightly coupled 0.86). Radiation air temperature significantly affected 0.71 ? R2 0.82) monthly scale, but not WUE. Drought 0.35) more than 0.25) or 0.07). A drought enhanced MP (19%) YP (11%), reduced 7% 19% YP, respectively, resulting (27–32%). Minor interannual variation (age > 10) suggested functioning became stable as stands matured. conclude cycles are coupled, different characteristics ages hydrologic regimes. suggests can be readily predicted from vice versa. The tradeoffs cycling should recognized management achieve multiple services (i.e., supply sequestration).
منابع مشابه
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ژورنال
عنوان ژورنال: Forests
سال: 2021
ISSN: ['1999-4907']
DOI: https://doi.org/10.3390/f12081123