Intensive culture of loblolly pine (Pinus taeda L.) seedlings on poorly drained sites in the Western Gulf region of the United States
Fertilization, chemical vegetation control and mechanical site preparation increased above-ground growth. Growth increment from mechanical site preparation was comparable to that from fertilization. Survival was not affected by any treatment. Fertilization enhanced root growth, more so in the shallow soil layers. Subsoil bulk density greatly restricted root growth, resulting in decreased above-ground growth. Chemical vegetation control made more soil water available to the seedlings during drought, resulting in increased seedling water potential. The effect of chemical vegetation control on seedling water potential was absent in the early growing season when soil moisture was abundant. Seedlings on plots treated with bedding-plus-fertilizer or bedding alone experienced stomatal closure at times of severe water stress while those treated with chemical vegetation control were able to continue net carbon dioxide assimilation. Fertilization did not increase needle nutrient concentrations, but increased needle weight, thereby increasing total nutrient content. Fertilization increased base cation concentrations in the soil solution, but had no effect on nitrogen and phosphorus concentrations. Intensive forest management was found to be a viable tool for optimum loblolly pine seedling growth and survival on poorly drained sites in the Western Gulf region of the United States.
Advisor:Messina, Michael G.; Hons, Frank M.; Fisher, Richard F.; Tjoelker, Mark G.
School:Texas A&M University
School Location:USA - Texas
Source Type:Master's Thesis
Keywords:loblolly intensive culture flatwoods fragipan fertilzer fertilization herbicides lysimeter minirhizotron nutrient
Date of Publication:08/01/2003