Abstract
Effectively managing net primary productivity in drylands for grazing and other uses depends on understanding how limited rainfall input is redistributed by runoff and runon among vegetation patches, particularly for patches that contrast between lesser and greater amounts of vegetation cover. Due in part to data limitations, ecohydrologists generally have focused on rainfall event size to characterize water redistribution processes. Here we use soil moisture data from a semiarid woodland to highlight how, when event size is controlled and runoff and interception are negligible at the stand scale, rainfall intensity drives the relationship between water redistribution and canopy and soil patch attributes. Horizontal water redistribution variability increased with rainfall intensity and differed between patches with contrasting vegetation cover. Sparsely vegetated patches gained relatively more water during lower intensity events, whereas densely vegetated ones gained relatively more water during higher intensity events. Consequently, range managers need to account for the distribution of rainfall event intensity, as well as event size, to assess the consequences of climate variability and change on net primary productivity. More generally, our results suggest that rainfall intensity needs to be considered in addition to event size to understand vegetation patch dynamics in drylands.
Original language | English (US) |
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Pages (from-to) | 2094-2100 |
Number of pages | 7 |
Journal | Ecological Applications |
Volume | 25 |
Issue number | 8 |
DOIs | |
State | Published - Dec 1 2015 |
Keywords
- Canopy
- Dry Chaco woodlands
- Forest
- Rainfall intensity
- Rangelands
- Spatial heterogeneity
- Water balance
ASJC Scopus subject areas
- Ecology
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Appendix D. Regressions between weighted average intensity and maximum intensity as a function of rainfall event size based on 20-min frequency records of precipitation in the field.
Magliano, P. N. (Creator), Breshears, D. D. (Creator), Fernandez, R. J. (Contributor) & Jobbagy, E. G. (Contributor), figshare, 2016
DOI: 10.6084/m9.figshare.3521342, https://wiley.figshare.com/articles/dataset/Appendix_D_Regressions_between_weighted_average_intensity_and_maximum_intensity_as_a_function_of_rainfall_event_size_based_on_20-min_frequency_records_of_precipitation_in_the_field_/3521342
Dataset
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Appendix B. Full description of patch attributes including the fourteen biophysical variables measured in the field, and correlation matrix of the 14 biophysical attributes.
Magliano, P. N. (Creator), Breshears, D. D. (Creator), Fernandez, R. J. (Contributor) & Jobbagy, E. G. (Contributor), Wiley, 2016
DOI: 10.6084/m9.figshare.3521351.v1, https://wiley.figshare.com/articles/dataset/Appendix_B_Full_description_of_patch_attributes_including_the_fourteen_biophysical_variables_measured_in_the_field_and_correlation_matrix_of_the_14_biophysical_attributes_/3521351/1
Dataset
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Appendix C. Correlation coefficients obtained between patch water capture and each biophysical attribute.
Magliano, P. N. (Creator), Breshears, D. D. (Creator), Fernandez, R. J. (Contributor) & Jobbagy, E. G. (Contributor), Wiley, 2016
DOI: 10.6084/m9.figshare.3521345.v1, https://wiley.figshare.com/articles/dataset/Appendix_C_Correlation_coefficients_obtained_between_patch_water_capture_and_each_biophysical_attribute_/3521345/1
Dataset