TY - CHAP
T1 - Carbon Allocation Dynamics in Mediterranean Pines Under Stress
AU - Klein, Tamir
N1 - The author would like to thank JJ Camarero of the Spanish National Research Council for his useful comments on a previous version of this chapter.
PY - 2021/10/13
Y1 - 2021/10/13
N2 - Carbon (C) allocation in trees involves three different aspects, namely, the fate of C in terms of tree compartment, C compound, and physiological process (often termed C flux). A review and synthesis of the recent literature on C allocation dynamics in Mediterranean pines, with an emphasis on stress conditions, reveals some important patterns. First, C allocation to stem growth is highly plastic in phenology and magnitude, whereas C allocation to needle growth is sensitive to growing conditions (e.g. drought, competition), but genetically programmed with respect to timing and magnitude. Second, starch is a major C reserve in Mediterranean pines, providing C under limited photosynthesis for weeks and months, replenished during recovery before growth is resumed, and stored at high concentrations in the root system. Third, C respiration is dominated by the roots, while growth and litter production are dominated by the foliage. Relocation fluxes occur under summer drought, i.e. from stem to foliage, and from roots to stem. Although minor in magnitude, these C fluxes might represent an important drought acclimation mechanism for pines in the Mediterranean.
AB - Carbon (C) allocation in trees involves three different aspects, namely, the fate of C in terms of tree compartment, C compound, and physiological process (often termed C flux). A review and synthesis of the recent literature on C allocation dynamics in Mediterranean pines, with an emphasis on stress conditions, reveals some important patterns. First, C allocation to stem growth is highly plastic in phenology and magnitude, whereas C allocation to needle growth is sensitive to growing conditions (e.g. drought, competition), but genetically programmed with respect to timing and magnitude. Second, starch is a major C reserve in Mediterranean pines, providing C under limited photosynthesis for weeks and months, replenished during recovery before growth is resumed, and stored at high concentrations in the root system. Third, C respiration is dominated by the roots, while growth and litter production are dominated by the foliage. Relocation fluxes occur under summer drought, i.e. from stem to foliage, and from roots to stem. Although minor in magnitude, these C fluxes might represent an important drought acclimation mechanism for pines in the Mediterranean.
U2 - https://doi.org/10.1007/978-3-030-63625-8_7
DO - https://doi.org/10.1007/978-3-030-63625-8_7
M3 - فصل
SN - 9783030636241
T3 - Managing Forest Ecosystems
SP - 117
EP - 128
BT - Pines and Their Mixed Forest Ecosystems in the Mediterranean Basin
ER -