RAPID RESPONSE CURVES AND SURVEY MEASUREMENTS

摘要

Systems and methods for measuring plant leaf gas exchange based on instantaneous mass balance in the sample chamber. The response of leaf net assimilation rate (A_net) to computed leaf internal CO₂ concentration (C_i) is measured by continuously varying the input CO₂ concentration and measuring the continuous difference between chamber input (reference) and output (sample) concentrations to compute a continuous series of A_net values, which can then be plotted against computed C_i. When combined with a similar response test using an empty chamber test to allow for sample chamber mixing and/or gas analyzer match dynamics and/or small flow-related residual time delays, such method provides accurate and rapid A C_i response (RAC_iR) curves in a much shorter time than conventional methods.