Browsing Journal of Range Management, Volume 49, Number 2 (March 1996) by Title
Now showing items 17-18 of 18
Tallgrass prairie vegetation response to spring burning dates, fertilizer, and atrazineTallgrass prairies provide an important source of hay and summer forage in eastern Nebraska. A study was conducted in 1989 and 1990 on 2 late seral tallgrass prairies near Lincoln and Virginia, Nebraska to determine if production of selected components of tallgrass prairie communities could be altered by burning (not burned, or burned in either early, mid-, or late spring)and applying fertilizer (0 and 67-23 kg N-P ha-1) and atrazine [6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine] (0 and 2.2 kg a.iha-1). Vegetation was harvested the year treatments were applied at about 30-day intervals starting in June and ending in August. Maximum big bluestem (Andropogon gerardii var. gerardii Vitman) accumulated standing crop (ASC) on unburned areas and areas burned in mid-spring occurred later in 1990 than in 1989. Burning in late spring 1989 maintained big bluestem ASC above 1,100 kg ha-1 through July, whereas big bluestem ASC declined below 840 kg ha-1 in July on areas where other burn treatments were applied. In 1990, big bluestem ASC exceeded 1,570 kg ha-1 in June on areas burned in early and midspring and exceeded 1,500 kg ha-1 in July on areas that were not burned or burned in mid- or late spring. From July to August 1990 big bluestem ASC declined below 730 kg ha-1 for all treatments except the late spring burn treatment where ASC was 1,340 kg ha-1. Burning in late spring reduced prairie dropseed [Sporobolus heterolepis (A. Gray) A. Gray] and tall dropseed [S. asper (Michx.) Kunth.] ASC by at least 67% in June 1990 compared to areas burned in early and mid-spring. Cool-season grass ASC at Virginia declined 86% in June when burned in late spring compared to areas that were not burned. Fertilization increased big bluestem ASC by about 23 and 29% in June and July. Vegetation response to atrazine was variable. Atrazine had a negligible effect on big bluestem ASC. Burning late seral tallgrass prairie in late spring increased big bluestem ASC later in the growing season and decreased cool-season grasses more effectively than burning earlier in the spring.
Viewpoint: Sustaining rangeland landscapes: a social and ecological processSustaining rangeland ecosystems is as much a social process as an ecological one. It requires application of many of the same principles as those used in planning for wildlife reserves, but the tenets of conservation biology need to be applied to conserve social as well as ecological structural elements and processes. For some rangelands, a crucial element in a sustainable, culturally meaningful, and ecologically rich landscape is ranching, which is at once a collection of ecological processes and interactions, and an expression of human community. Results of several surveys and studies are used to highlight the "culture clashes" that occur at the ecological and social edges of landscape elements. Unfortunately, differing expectations of what conserved areas should be like has hindered the creation of alliances between environmentalists and ranchers that might prevent the degradation of the landscape by uncontrolled residential and urban development. In one California case, successful planning and alliance building led to the conservation of ranchlands. Zoning, conservation easements, political and financial support for the livestock industry, community leadership, and recognition of the heritage value of rural lifeways all played a part in this success. Similar patterns have been noted in other parts of the West. To conserve some of the most productive and biodiverse rangeland landscapes, ranching must not just be tolerated as a means to an environmental end, but valued and planned for, ecologically, socially, and economically. Rangeland professionals have an important role to play in the development of sustainable social relationships that support sustainable rangelands.