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Controlling transpiration in aspen with phenylmercuric acetate
Author(s) -
Hart G. E.,
Schultz J. D.,
Coltharp G. B.
Publication year - 1969
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr005i002p00407
Subject(s) - transpiration , environmental science , water content , horticulture , moisture , daylight , hydrology (agriculture) , zoology , botany , geology , biology , meteorology , geotechnical engineering , photosynthesis , geography , physics , optics
A 0.001 M spray of phenylmercuric acetate was applied by helicopter to part of an aspen stand in northern Utah in June, 1967. The natural fluttering action of the aspen leaves facilitated delivery of the spray to the stomate‐bearing underside of the leaves. Nine days after treatment, stomate width on treated trees averaged 2.4 μ as compared with 4.0 μ measured on untreated trees. Heat pulse measurements indicated reduction in daylight sap velocity from 11 cm/hr to 6 cm/hr. Seasonal soil moisture depletion was not significantly affected, although the pattern of water usage was delayed for about 6 weeks on the treated area.