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Please use this identifier to cite or link to this item: https://ptsldigital.ukm.my/jspui/handle/123456789/578339
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dc.contributor.authorChong S. Y (UPM)
dc.contributor.authorTeh C. B. S (UPM)
dc.contributor.authorAinuddin A. N (UPM)
dc.contributor.authorPhilip E
dc.date.accessioned2023-11-06T03:00:31Z-
dc.date.available2023-11-06T03:00:31Z-
dc.date.issued2018-02
dc.identifier.issn1511-3701
dc.identifier.otherukmvital:115849
dc.identifier.urihttps://ptsldigital.ukm.my/jspui/handle/123456789/578339-
dc.descriptionMany net rainfall models have been developed, but they are often complex, data demanding and usable only for a spe validate two simple equations (a two- and a three-coefficient equation) for nearly full canopies of oil palm, rubber and pine trees. Throughfall and stemflow data from seven past studies were used to determine the best-fit coefficients for the two equations. The threecoefficient equation was Pn = Pg x exp [- {0.3443 – (Pg / (58.9748 + Pg)} x 0.1639)] and the two-coefficient equation was Pn = 0.7724 x Pg – 0.5845 (R2 = 0.91), where Pn and Pg are the net and gross rainfall, respectively. To validate these two equations, field data collections were started. Thirteen rain gauges fit with data loggers were used for rainfall measurement. Three sampled trees were selected randomly for stemflow measurement and one rain gauge was installed at a nearby open area. Two error indices were used as a goodness-of-fit measure for equation accuracy: index of agreement and normalised mean absolute error. The results showed that the two- and three-equation equations performed nearly equally well. They predicted the net rainfall with an error of between 12 to 23% (ranked as “Fair” to “Good” in terms of overall equation accuracy) and with an index of agreement of more than 90%. The results showed that these two equations can be used fairly accurately to estimate throughfall and net rainfall, and, to a lesser degree, stemflow. Estimation errors occurred most probably because canopy and rainfall characteristics were not taken into account in the two equations.
dc.language.isoen
dc.publisherUniversiti Putra Malaysia Press
dc.relation.haspartPertanika Journals
dc.relation.urihttp://www.pertanika.upm.edu.my/regular_issues.php?jtype=1&journal=JTAS-41-1-2
dc.rightsUKM
dc.subjectInterception loss
dc.subjectOil palm
dc.subjectPine
dc.subjectRainfall
dc.subjectRubber
dc.subjectStemflow
dc.subjectThroughfall
dc.subjectWater balance
dc.titleSimple net rainfall partitioning equations for nearly closed to fully closed canopy stands
dc.typeJournal Article
dc.format.volume41
dc.format.pages81-100
dc.format.issue1
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