Temporal Stability of Throughfall Spatial Pattern under Individual Oak Trees in the Zagros Region (Case Study: Neighboring Forests of Ilam)

Document Type : Research Paper

Authors

1 Ph.D Candidate, Faculty of Natural Resources and Marine Sciences, University of Tarbiat Modares, Noor, I.R. Iran

2 Associate Professor, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran

3 Professor, Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran

Abstract

Spatio-temporal variability of throughfall (TF) has an important role on the biogeochemical processes,
soil, watershed hydrology as well as the nutrient cycle in forests. Spatial distribution and temporal
stability of TF patterns by five individual Persian oak trees (Quercus brantii var. Persica) in the
Zagros forests of western Iran, Ilam, was quantified. Sixteen TF manual gauges were placed beneath
the five selected tree canopies in the eight geographic directions and the gross rainfall (GR) was
measured by the mean of six homemade gauges records placed in an open area adjacent to the study
site. Rainfall interception (I) was indirectly estimated as the difference between GR and TF. The
measurements were recorded during three months from end of December 2010 to beginning of April
2011. During this period, 24 rainfall events with cumulative depth of 302.4 mm was collected, of
which on average 14.3% evaporated as I or expended as canopy storage by individual Persian oak
trees. Less than 6% of sampling points in the time stability plots deviated consistently (α= 0.05) from
the mean normalized TF, meaning lower heterogeneity of TF compared to other studies on the forest
stands. Moreover, generally ranking of TF collectors of time stability plots confirmed lower TF
concentrations near the tree trunks for individual Persian oak trees. Time stability plots in the current
study were appeared a useful tool to quantify TF distribution of individual Persian oak trees.

Keywords

References

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Forest and Wood Products
Volume 67, Issue 3 - Serial Number 3
October 2014
Pages 397-409

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