Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 9101248 |
| Dissertation Research: Biogeochemistry at the Desert Shrubland-Desert Grassland Boundary | |
| William Schlesinger | |
| 主持机构 | Duke University |
| 开始日期 | 1991-05-15 |
| 结束日期 | 1993-10-31 |
| 资助经费 | 10078(USD) |
| 项目类别 | Standard Grant |
| 资助机构 | US-NSF（美国国家科学基金会） |
| 项目所属计划 | POP & COMMUNITY ECOL CLUSTER |
| 语种 | 英语 |
| 国家 | 美国 |
| 英文简介 | Shrub invasions into grassland cause long term changes in plant community structure that are indicative of desertification in the southwestern United States. Shrub replacement of grassland may also influence the dynamics of ecosystem nutrient cycling. Both the longevity of desert shrubs and the long term accumulation of soil nutrients under desert shrubs in "islands of fertility" may act in tandem as a positive biological feedback for continued desertification. This study combines state-of-the-art stable isotope techniques with traditional soil science and plant ecology methods to address the following questions: 1) Which soil nutrients comprise an island of fertility?; 2) Do biotically-regulated soil nutrients become more spatially heterogeneous over time as desertification proceeds?; 3) How does shrub presence or absence affect rates of island of fertility formation and degradation?; and 4) Does soil nutrient concentration correlate to the degree of island of fertility development and has C3 shrubland recently replaced C4 grassland at the Sevilleta NWR, New Mexico? Answers from this research will provide valuable insight towards a more complete understanding of the dynamics of desertification in the southwestern United States. |
| 来源学科分类 | Biological Sciences |
| URL | https://www.nsf.gov/awardsearch/showAward?AWD_ID=9101248 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/341000 |
| 推荐引用方式 GB/T 7714 | William Schlesinger.Dissertation Research: Biogeochemistry at the Desert Shrubland-Desert Grassland Boundary.1991. |
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