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Effects of Fire Management of Southwestern Natural Resources

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Effects of Fire Management of Southwestern Natural Resources This file was created by scanning the printed publication. Errors identified by the software have been corrected; however, some errors may remain. Fire Effects On Grasses In Semiarid Deserts 1 Jerry R. Cox, F.A. lbarra-F, M.H. Martin-R2 Semidesert grasslands and shrub­ ings and place a practical value on Precipitation, temperature, and lands in North America are bordered fire in semidesert grasslands and soil classification are presented in on the east by Rio Grande River, on shrublands. table 1. Elevation is greatest at Em­ the west by the Colorado River, on pire Ranch, intermediate at SRER the north by the Colorado Plateau, and least at Carbo. Precipitation dis­ and on the south by the Sierra Madre Study Sites tribution is approximately 60% in in Mexico. In this area, lightning summer and 40% in winter. Freezing strikes from summer thunderstorms Three sites were selected along an temperatures are uncommon at have started fires since Pleistocene elevational gradient between south­ Carbo but do occur in January and (Pyne 1982), but when European man eastern Arizona and northern Son­ February. Freezing temperatures oc­ entered the area fire was applied in ora, Mexico. Sites were located (1) cur between December and March at spring, fall and winter (Bahre 1986; 120 km north of Hermosillo, Mexico SRER, and between November and Hastings and Turner 1972). (Carbo); (2) 40 km south of Tucson, April at Empire Ranch. Seasonal burning kills tree and Arizona (Santa Rita Experimental shrub seedlings and has little or no Range-SRER); and (3) 80 km south­ effect on perennial grasses in the east of Tucson (Empire Ranch). Pre­ Methods And Materials American tall-grass prairies (Al­ dominant perennial forage grasses bertson and Weaver 1945; Weaver were buffelgrass (Cenchrus ciliaris) at Buffelgrass Herbage Sampling and Rowland 1952). Hence the as­ Carbo, Lehmann lovegrass (Eragrostis sumption by Sauer (1944), lehmanniana) at SRER, and big A 15-ha study area was fenced Humphrey (1958) and Wright and sacaton (Sporobolus wrightii) at Em­ within a 750-ha buffelgrass pasture at Bailey (1982) that fire has no effect on pire Ranch. Carbo, Mexico. Three, 50 by 100m semidesert grasses. In the past 10 years we have burned native and in­ troduced semidesert grasslands to determine seasonal fire effects on perennial grasses. The purpose of this paper is to summarize our find- 'Invited paper presented at Symposium on Effects of Are in Management of South­ western Natural Resources, November 75- 17, 1988, Tucson, Arizona. 2Cox is range scientist, USDA Agricultural Research Service, Arid/and Watershed Management Research Unit, 2CXJO E. Allen Road, Tucson, Ariz. 85719; lbarra-F and Martin-R are technical director and head of the Department of Range Management, respectively, CIPES, Periferico OTS SIN, Con­ junto UGRS, Postal 7754, Hermosillo, Sonora, Mexico. 43 plots were burned with a head fire in Twenty, 0.3 by 2.9 m sampling areas collected in August or September, either summer Ouly) or fall (October) were randomly selected for sampling one, two, and three growing seasons 1985, 1986, and 1987; plots were 1, 2, and 3years after fall burning. following fall treatments. Precipita­ burned once. Ten, 1 by 1 m sampling Plants were harvested at the soil sur­ tion amounts, grasses, statistical de­ areas were randomly selected for face in four sampling areas and herb­ sign and data collection techniques sampling 1, 2, and 3 years after the age separated into green and dead. differ among sites. Therefore, statisti­ fall bums. Buffelgrass was harvested Separated samples were weighed in cal comparisons are site specific. at the soil surface and separated into the field and a modified weight-esti­ General comparisons, however, will green and dead herbage. Herbage mate technique used to estimate both be made among sites. was dried at 40°C for 72 h, and green and dead herbage (Pechanec weighted. Herbage components from and Pickford 1937) in 16 sampling the ten sampling areas in a plot were areas. Separated samples were dried Fire Temperatures averaged, and the mean considered a at 40°C for 48 hand weighed. Regres­ replication. sion techniques were used to esti­ In Lehmann lovegrass plots mate dry weights from estimated burned in spring, summer and fall field weights (Campbell and Cassady 1985 and 1986, and in buffelgrass Lehmann Lovegrass Herbage 1949). plots burned in summer 1986 fire Sampling temperatures were recorded at S sec. intervals with a Campbell Scientific Forty-five, 15 by 15m plots were Design and Statistical Analysis 21 X data logger. In each plot, surface marked in a 6-ha exclosure. Plots temperatures were measured in six were burned with a head fire in ei­ Experimental design was a com­ crowns and in six open areas be­ ther winter (February), spring Oune), pletely randomized block with either tween plants. Temperatures were summer Ouly) or fall (October) 1984, three (SRER) or four (Carbo) replica­ similar at crown and open locations, 1985 and 1986. Ten, 0.25 by 0.25 m tions and burning treatments applied therefore, temperature for surface sampling areas were randomly se­ in either two (Carbo) or three (SRER) locations were combined. lected for sampling 1, 2, and 3 years seasons during three consecutive after the fall burns. Herbage was har­ years. At Empire Ranch, treatments vested at the soil surface, and three were arranged in a split block design Results sampling areas from a plot were with three replications. The three separated into green and dead herb­ years were randomized as blocks Buffelgrass Herbage age. Separated and unseparated within a replication and the three herbage samples were dried at 40°C seasons were randomized within Summer precipitation was 186, for 72 h and reweighed. years (Cox 1984, 1985). 311 and 144 mm (fig. 1) in 1985,1986 Either green or dead dry weights To demonstrate long-term fire af­ and 1987, respectively. Green leaves from the three separated sampling fects we are presenting herbage data appeared in less than 10 days on all areas in a plot were summed, and the contribution of each to the total dry 180 .... -----· herbage expressed as a percentage. 160 [81 i985 ~ 1986 Component percentages were multi­ z 0 plied by the total herbage dry 1--o 1-40 ~ 19B7 tsss 1- D ..o:a: weight. The derived dry weight com­ 1-- 0.. 120 --- 2S Yr. lttun ponent values for a plot were aver­ 1-1 u aged and the mean considered a rep­ ~~100 lication. Cl.! UJ 80 > H t- 60 oc;[ _J Big Sacaton Herbage Sampling :z: ::::> 40 u In January 1980, 15 by 15m plots 20 were marked within a fenced 2-ha 0 big sacaton study site. Plots were .JAN FEB ~AR APR ...... ..,. JUN Jut. AUG SEP ()CT NOV DEC burned with a head fire in winter MONTH (February), summer Ouly) and fall Figure 1.-Monthly precipitation amounts from 1985 to 1988 at a buffelgrass site near Carbo, (October) 1980, 1981, and 1982. Sonora, Mexico, and the monthly 25-year means at Carbo. 44 buffelgrass plants burned in summer; greater than unburned areas. While 1985-86, 1986-87 and 1987-88, respec­ but growth in the following 60 days in summers 1985 and 1987, storms tively. Fall burned plants produced depended on rainfall amount and were widely spaced, weekly amounts green leaves in either December distribution. In summer 1986, two or varied from 0 to 40 mm, and in mid­ (1986 and 1987) or February (1986), three storms occurred weekly during September green herbage from un­ but active growth occurred only in July and August, weekly amounts burned areas (300 kg/ha) was equal March 1986. Cool season moisture exceeded 25 mm, and in mid-Sep­ to summer burned areas. between February 20 and March 10, tember green herbage from .summer Fall, winter and spring precipita­ 1986 totalled 75 mm, and buffelgrass burned areas (1,900 kg/ha) was 25% tion was 113, 86 and 85 mm (fig. 1) in plants in burned and unburned areas produced large quantities of green leaves when nighttime temperatures exceeded 10°C in March. In March 1985 and 1987, growth was limited by dry soils and cold nighttime tem­ peratures. In the first summer growing sea­ son after burning in 1985 (1986), buffelgrass green herbage from un­ burned plants was 50% greater than that collected from burned plants (table 2). While green herbage col­ lected in summer 1987 (1 year after the 1986 bums and 2 years after the 1985 bums) varied from 200 to 555 kg/ha, it was similar among years and treatments. Green herbage pro­ duced in spring and summer be­ comes dead herbage in fall (table 3). Burning, irrespective of season, re­ moves dead herbage. Dead herbage is not an ideal forage resource be­ cause crude protein is less than that needed by lactating cows, but dead herbage removal must be followed by a reduction in stocking rates (Cox and Morton 1986). Lehmann Lovegrass Herbage Summer (June-August) precipita­ tion at the Lehmann lovegrass site was 115, 5, 10 and 60% greater than the long-term mean (169 mm) in 1984, 1986, 1987 and 1988, respec­ tively, but 25% less than the long­ term mean in 1985 (fig. 2). Cool-sea­ son (September- April) precipitation which included 3 to 5 snow storms in December and January was 125 to 200% greater than the long-term mean (147 mm), in the three years. Lehmann lovegrass leaves ap­ peared within 14 days after burning in winter, spring, summer and fall, 45 but green leaves on fall burned Big sacaton leaves began to appear peared to stimulate green leaf pro­ plants disappeared in October and within 20 days on plants burned in duction in August.
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