Santa Rita Experimental Range
Repeat Photography

Photo Station #179

Photo Archive No. 179.1.1938.03.1

C-220. Photo Station 179, Study Area #133, SE corner contour trenching area, 18 inch contours. Rg main grass with density of approximately 0.03. Photo prior to trenching. See C-257. 3/10/38. 301.

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Photo Archive No. 179.1.1938.03.2

C-257. P.S. 179. Study Area #133, SE corner of 18 inch contour terraces. See C-220. 3/28/38. 301.

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Photo Archive No. 179.1.1987.09

PS-179. Azimuth 272. Sept. 22, 1987. RFB. Canon AE-1 camera. 35mm WA lens. Robert F. Buttery.

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Photo Archive No. 179.1.2000.11

PS 179. November 21, 2000, 11:15 a.m. Facing west. Azimuth 272. Pasture 2S. ASA 125 Plus X film. 35mm lens focal length. Zizyphus on left remains from 1938 photos. Eragrostis lehmanniana is dominant grass; burroweed and snakeweed are present; Mimosa dysocarpa in front of Zizyphus. Setaria, Digitaria californica under Zizyphus and Mimosa; Muhlenbergia porteri under mesquite behind Zizyphus; some calliandra in open areas, about 15 paces west of road 486. M. McClaran.

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Photo Archive No. 179.1.2007.03

PS. 179. 23 March 2007. Facing west, Azimuth 272. Pasture 2SW. Elevation 1127 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Witness present, camera above. Mesquite alive, less than half of burroweed dead. Many Krameria and scattered Calliandra. Mimosa and Ziziphus midground left. Prickly pear present. Small Lehmann lovegrass dominate open areas with some cottontop. Cottontop, bush muhly and Setaria under larger mesquite. Cloudy conditions. Compared to 2000, less grass and burroweed now. M. McClaran photographer, no assistant.

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Photo Archive No. 179.1.2009.03

PS. 179. 17 March 2009. Facing west, Azimuth 272. Pasture 2SW. Elevation 1124 m. ISO 100, 35mm focal length, Canon 5D Digital Camera. Witness present, camera above. Mesquite alive, burroweed present. Many Krameria and scattered Calliandra. Mimosa and Ziziphus in midground left. Prickly pear present. Lehmann lovegrass dominant grass with some cottontop. Cottontop, bush muhly and Setaria under larger mesquite. Trees present in 1938 photo are still present in area but not visible in this photograph or photo in 2007. Compared to 2007, increase in cottontop, and extensive stem girdling on mesquite. M. McClaran photographer, A. Peterson assistant.

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Photo Archive No. 179.1.2015.03

PS. 179. 18 March 2015. 9:53 am. Facing west, Azimuth 272. Pasture 2SW. Elevation 1124 m. ISO 320, 35mm focal length, Canon 5D Mark II Digital Camera. Witness present, camera above. Mesquite alive, and leaves emerging. Snakeweed and burroweed present. Many Krameria and scattered Calliandra (flowering). Mimosa and Ziziphus midground left. Cottontop, bush muhly, threeawn and Setaria under larger mesquite. Trees and present in 1938 photo are still present in area but not visible in this photograph or photo. However, Ziziphus from 1938 is in left mid-ground. Compared to 2009, decrease in Lehmann lovegrass and burroweed. M. McClaran photographer, K. Hawkes assistant.

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Photo Archive No. 179.1.2021.03

PS. 179. 12 March 2021. 10:09 am. Facing west, Azimuth 272. Pasture 2SW. Elevation 1124 m. ISO 160, 35mm focal length, Canon 5D Mark II Digital Camera. Witness present, camera above. Mesquite alive. Snakeweed and burroweed present. Many Krameria and scattered Calliandra. Mimosa and Ziziphus in midground left. Prickly pear in distance right. Cottontop, bush muhly, threeawn and Setaria under larger mesquite. Trees present in 1938 photo are still present in area but not visible in this photograph. However, Ziziphus from 1938 is present in left mid-ground. Compared to 2015, following very dry and hot conditions between July 2020 and March 2021, very little grass production in summer 2020 and very little green grass present now; slight increase in cottontop; prickly pear in distant right is appeared. M. McClaran photographer, A. Gorlier assistant.

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