Partitioning tree water usage into storage and transpiration in a mixed forest

Abstract Background Water migration and use are important processes in trees. However, it is possible to overestimate transpiration by equating the water absorbed through plant roots that diffused back atmosphere stomatal transpiration. Therefore, necessary quantify transpired stored plants. Method The δ 2 H/δ 18 O technique heat ratio method were used explore usage of coniferous broad-leaved tree species, including proportions for storage. Results Platycladus orientalis Quercus variabilis had strong plasticity their from different sources. primarily groundwater (30.5%) 60–100-cm soil layer (21.6%) throughout experimental period was sensitive precipitation, absorbing 0–20-cm (26.6%) during rainy season. all sources (15.7%–36.5%) except 40–60-cm dry In addition, did not change its source but increased uptake annual mean fluxes P. Q. 374.69 469.50 mm·year − 1 , with 93.49% 93.91% transpiration, respectively. nocturnal sap flow mainly storage trunk rather than which effectively alleviated drought stress facilitated transport nutrients. Conclusions both species comprised 6%–7% total and, therefore, should be considered balance models.