This project was designed to investigate the response of plant growth and reproduction to short- and long-term variation in biotic and abiotic environmental variables. Several perennial taxa, including tree (Juniperus monsperma and Pinus edulis), shrub (Larrea tridentata) and bunch grasses (Oryzopsis hymenoides (now Achnaterum hymenoides) and Sporobolus contractus) species, were monitored at 1-3 sites differing in elevation and topography as well as edaphic variables and annual precipitation. The sites represented optimal or marginal/transitional zones for particular species. Demographic measurements were made biannually, after the 'wet' (fall) and 'dry' (spring) seasons. For tree and shrub species, estimates of growth and reproduction were based on branch demography, with ten branch tips from 10-20 individuals per species per site repeatedly measured from 1989-1993.Â For J. monsperma, P. edulis and L. tridentata, vegetative growth (i.e., branch growth) as well as reproduction were monitored. Additional measurements included needle length for P. edulis and leaf production, leaf size and branchlet production for L. tridentata. For grasses, basal diameter, leaf length and reproduction were monitored for 100 individuals per species per site. This project, SEV006, contains only data on pinon branch demography.Â Data on other variables and species is contained in SEV024, SEV025, SEV026, SEV027, and SEV028.
Knowledge Network for Biocomplexity (KNB) Identifier
Data Policies: This dataset is released to the public and may be freely downloaded. Please keep the designated Contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement of the Sevilleta LTER. Datasets must be cited as in the example provided. A copy of any publications using these data must be supplied to the Sevilleta LTER Information Manager. By downloading any data you implicitly acknowledge the LTER Data Policy (http://www.lternet.edu/data/netpolicy.html).
1989-05-08 - 1993-09-13
This site encompasses the upper reaches of Goat Draw and is dominated by pinon-juniper vegetation. Two pinon branch demography study sites were located here, each with 49 labeled trees, in a small canyon which drains the Los Pinos Mountains to the east. Vegetation is characterized as a pinon/juniper woodland with occasional occurrences of Quercus turbinella, Yucca spp. and Opuntia spp. Portions of the bird community assessment and plant phenology studies were also located within Goat Draw.
Marshall, Diane (2016-03-03): Pinon Branch Demography Study at the Sevilleta National Wildlife Refuge, New Mexico (1989-1993). Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/7f398daeaff9bb36d10921f8b4050863