Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 8811160 |
| REU: Interactions in Time and Space Variability in a Chihuahuan Desert Ecosystem: Jornada LTER | |
| Walter Whitford | |
| 主持机构 | New Mexico State University |
| 开始日期 | 1989 |
| 结束日期 | 1992-04-30 |
| 资助经费 | 1232769(USD) |
| 项目类别 | Continuing Grant |
| 资助机构 | US-NSF（美国国家科学基金会） |
| 项目所属计划 | LONG-TERM ECOLOGICAL RES (LTER, LONG-TERM PROJCTS IN ENVIR BIO, CROSS-DIRECTORATE PROGRAMS, SPECIAL PROGRAMS-RESERVE |
| 语种 | 英语 |
| 国家 | 美国 |
| 英文简介 | This research project will examine the general hypothesis that desertification has altered a previous, relatively uniform distribution of water and nitrogen by increasing their spatial and temporal heterogeneity, leading to changes in community composition and biogeochemical processes in Chihuahuan Desert ecosystems. The Jornada Experimental Ranch (southern New Mexico), with a 75-year history of rangeland research, has documented extensive changes in vegetation cover - from perennial grassland to several kinds of shrublands - which are one result of desertification. The work will include measurements of net primary production, root growth, decomposition, soil water dynamics, surface hydrology, dynamics of animal populations, animal-produced soil disturbance, nitrogen cycling processes, and stable isotope distributions of nitrogen and carbon in widespread ecosystems, ranging from black grama (Bouteloua eriopoda) grassland, to desertified, persistent shrublands of creosotebush (Larrea tridentata), tarbush (Flourencia cernua) and mesquite (Prosopis gladulosa). A conceptual model of desertification will be tested by long-term water augmentation and mechanical homogenization of water and nutrients. Data from these studies will be used to parameterize process models. Measurements of water, wind, and gaseous transport and run-on diversion experiments will provide data for a desert landscape model. Data derived from satellite remote sensing of vegetation and soils will be incorporated into a dynamic geographic information system model of the Jornada Basin. Institutional support remains excellent for the continuation of this project. Facilities are very good. The three-institution collaborative arrangement involving several investigators has been well thought out and should prove to be highly beneficial and productive. Results from this research project should yield major findings that are fundamental to the broad field of ecology. Additionally, results should be important to the future, better enlightened management of arid land resources. |
| 来源学科分类 | Biological Sciences |
| URL | https://www.nsf.gov/awardsearch/showAward?AWD_ID=8811160 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/340960 |
| 推荐引用方式 GB/T 7714 | Walter Whitford.REU: Interactions in Time and Space Variability in a Chihuahuan Desert Ecosystem: Jornada LTER.1989. |
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