Jornada Basin LTER Research

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Dataset: Estimated Number of Nodulating Rhizobia in Mesquite at Watered and Unwatered Dune Sites, 1988 and 1989


   Download data: File mesquite_nodulatingrhizobia.csv
   File description including attribute definitions: mesquite_nodulatingrhibozia
   Original Investigator: Ross Virginia
   Duration: 1988 - 1989
   Dataset ID: 210386004
   DOI: 10.6073/pasta/d79b4678590309a11608633a21811dd0
   Abstract:

Five mesquite dunes were irrigated by pumping water from a storage tank located 200 m away. Five nonirrigated dunes served as control. Soil samples were collected from mesquite trees at control and watered sites, and analyzed for the number of rhizobia nodules. This study is complete.


   Additional information:

Soil cores were collected under mesquite (Prosopis glandulosa) trees at the dune site on the Jornada LTER site located in the northern Chihuahuan Desert near Las Cruces, New Mexico. Precipitation is 230mm/yr, with half occurring during the summer. The vegetation is coppice mesquite dunes (30% cover) with scattered shrubs of saltbush and snakeweed.

   Methods:

Field and instrumental data sheets

   Methods:

Five mesquite dunes were irrigated by pumping water from storage tank located 200 m from the site. Water was applied to the dunes with an overhead sprinkler (later replaced by a drip irrigation system to minimize wind drift) located at the apex of each dune. Irrigation began in March with approximately 2.5 cm applied 2-3 times/week for 6 weeks to initially wet the dry soil. Thereafter high water availability was maintained by weekly irrigation. Five nonirrigated dunes served as control. Soil samples were collected (hand augered) under mesquite (Prosopis glandulosa) trees at sand dune site on the Jornada LTER site to three depths, 0-50 and 50-100, and 100-150cm. Soil samples were placed in plastic bags, tied, and stored in portable coolers. Concentrations of mesquite-nodulating rhizobia in field-moist soil samples were estimated using the plant-infection, most probable number (MPN) technique (Vicent 1970).

   Maintenance:

seven times; this dataset is complete