Sap flow in ‘Tommy Atkins’ mango trees under regulated deficit irrigation

Abstract Knowledge of transpiration is of fundamental importance for improving irrigation management. This study measured sap flow of the 'Tommy Atkins' mango tree using Granier’s thermal dissipation probe method under regulated deficit irrigation. The work was conducted in a 10-year-old ‘Tommy Atkins’ mango orchard, irrigated by micro sprinkler, located in the Irrigated Perimeter of Ceraíma, in Guanambi, Bahia, Brazil. Sap flow measurements were carried out on three consecutive days in plants under regulated deficit irrigation, with reductions of 30 and 60% of crop evapotranspiration in three phases of fruit development; beginning of flowering to early fruit growth (Phase I), fruit expansion (Phase II) and physiological maturation of fruits (Phase III). Regulated deficit irrigation led to reduced sap flow in ‘Tommy Atkins’ mango tree.

摘要：蒸腾作用相关知识对于优化灌溉管理具有基础性重要意义。本研究采用Granier热扩散探针法（Granier’s thermal dissipation probe method），在调亏灌溉（Regulated Deficit Irrigation）条件下，测定了‘汤米·阿特金斯’（Tommy Atkins）芒果树的树液流量。试验设于巴西巴伊亚州瓜南比市塞赖马灌溉区（Irrigated Perimeter of Ceraíma）内一处10年树龄的‘汤米·阿特金斯’芒果园，灌溉方式为微喷灌。研究针对调亏灌溉处理的植株连续三日开展树液流量测定，调亏梯度分别为削减作物蒸发蒸腾量的30%与60%，覆盖果实发育的三个阶段：开花初期至果实早期生长阶段（第一阶段，Phase I）、果实膨大阶段（第二阶段，Phase II）以及果实生理成熟阶段（第三阶段，Phase III）。结果表明，调亏灌溉可降低‘汤米·阿特金斯’芒果树的树液流量。