Understanding the interaction between canopy structure and the parameters of interception loss is essen-tial in predicting the variations in partitioning rainfall and water resources as affected by changes in canopy structure and in implementing water-based management in semiarid forest plantations. In this study, seasonal variations in rain-fall interception loss and canopy storage capacity as driven by canopy structure were predicted and the linkages were tested using seasonal filed measurements. The study was conducted in nine 50?m?×?50?m Robinia pseudoacacia plots in the semiarid region of China's Loess Plateau. Gross rain-fall, throughfall and stemflow were measured in seasons with and without leaves in 2015 and 2016. Results show that measured average interception loss for the nine plots were 17.9％ and 9.4％ of gross rainfall during periods with leaves (the growing season) and without leaves, respectively. Average canopy storage capacity estimated using an indirect method was 1.3?mm in the growing season and 0.2?mm in the leafless season. Correlations of relative interception loss and canopy storage capacity to canopy variables were highest for leaf/wood area index (LAI/WAI) and canopy cover, fol-lowed by bark area, basal area, tree height and stand density. Combined canopy cover, leaf/wood area index and bark area multiple regression models of interception loss and canopy storage capacity were established for the growing season and in the leafless season in 2015. It explained 97％ and 96％ of the variations in relative interception loss during seasons with and without leaves, respectively. It also explained 98％ and 99％ of the variations in canopy storage capacity during seasons with and without leaves, respectively. The empiri-cal regression models were validated using field data col-lected in 2016. The models satisfactorily predicted relative interception loss and canopy storage capacity during seasons with and without leaves. This study provides greater under-standing about the effects of changes in tree canopy structure (e.g., dieback or mortality) on hydrological processes.

Changkun Ma;Yi Luo;Mingan Shao;Xiaoxu Jia

State Key Laboratory of Eco?Hydraulics in Northwest Arid Region,Xian University of Technology,Xian,China;Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences, Beijing 100101,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100190,China

林业研究（英文版）

[1]Changkun Ma;Yi Luo;Mingan Shao;Xiaoxu Jia-.Estimation and testing of linkages between forest structure and rainfall interception characteristics of a Robinia pseudoacacia plantation on China's Loess Plateau)[J].林业研究（英文版）,2022(02):529-542

leafless,dieback

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