Fluff grass plant total nitrogen

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Dry weight biomass and total nitrogen were determined for flowers, green leaves and yellow and grey leaves of fluffgrass plants collected from plots. Twenty 6 x 6 m plots were established with a 3 m buffer between plots. Five plots were randomly assigned to one of four treatments: (1) chlordane amendment 100ml AI (active ingredients) per 10,000 ml) to exclude microarthropods, (2) sprinkler irrigation (6 mm per week), (3) sprinkler irrigation (6 mm/week) plus chlordate amendment (as above), (4) control (no treatment).

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field data sheets

Three plants were collected from each plot. Plants were separated into flowers, green leaves and yellow/grey leaves. Shoot material was oven-dried for 96 hours at 50 C, weighed and ground in a Wiley Mill for chemical analysis. The ground plant was prepared for nitrogen analysis by a micro Kjeldahl digestion using an aluminum block digester (Keeney and Nelson 1982). Nitrogen analyses were performed on the digest using automated procedures (Keeney and Nelson 1982) on a Scientific Instruments Coninuous Flow Analyzer.

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This study was conducted in the Jornada del Muerto Basin on the NSF Long-Term Ecological Research (LTER) site, located on the New Mexico State University College Ranch 40 km NNE of Las Cruces, Dona Ana County, New Mexico. The site lies on an alluvial piedmont (bajada) sloping from west to the east and north. The non-arroyo areas of the upper bajada where this study was conducted have an essentially monospecific shrub cover of creosotebush and support a veriety of annuals and the small perennial grass Erioneuron pulchellum (fluff grass). Study plots were established in an area that is downslope from the LTER Upper Trailer and immediately downslope from the road running from the NMSU College Ranch headquarters SSE past the LTER Weather Station and exiting the College Ranch at the south boundary on the same powerline road that runs on along the north side of Mt. Summerford in the Dona Ana Mountains.


3 times (May, June, July 1986)

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