No carbon shortage in declining trees of the isohydric species Araucaria araucana (Molina) K. Koch under drought

Abstract Key message At the sixth and seventh years of a drought event in south Chile, non-structural carbohydrate (NSC) concentrations were similar between healthy unhealthy trees Araucaria araucana (Molina) K. Koch, growth did not decrease, suggesting that leaf loss prevented C shortage trees. Context Tree resistance resilience may be impaired by decreasing carbohydrates (NSC). During 7-year drought, isohydric species (Araucariaceae) evidenced decline (foliage browning). Aims To determine whether tree was related to an carbon status reduced growth. Methods In two sites southern we selected healthy- unhealthy-looking study effects on NSC We measured basal area increment (BAI) needles roots after 6 (2016) following one less severe year terms (2017). Results both years, had sugar needle roots, furthermore, they maintained their rates. 2017, NSC, starch, (but roots) increased at sites, while vary. Conclusion Unhealthy likely through acclimation mechanism such as foliage loss. The remarkable found indicates absence starvation lost substantial fraction under drought.