Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/10183928 |
| 报告编号 | DOE/ER/60612--4 |
| 来源ID | OSTI_ID: 10183928 |
| Nitrogen availability as a control mechanism of secondary succession within a semiarid shrubland ecosystem. Final report, October 1, 1990--June 27, 1992 | |
| Redente, E.F.; McLendon, T. | |
| 英文摘要 | Three experiments were conducted within a semiarid shrubland to test the role of nitrogen availability as a control mechanism in secondary succession. Secondary succession patterns were documented for seven years and effects of increased and decreased N availability levels, fumigation, and competition by early-seral species were tested. Differential responses by seral species were determined and related to successional patterns. Nitrogen availability was found to be a primary mechanism controlling the rate of succession. Relative growth rate was an important factor determining which species initially dominated and N availability became the primary control factor by the third year. As N availability increased, the rate of succession decreased. Conversely, as N availability was decreased, the rate of succession increased. The abundance of annuals was increased and abundance of perennials decreased by increased N availability. Tissue N concentration was related to lifeform and seral position, and these relationships were important in the transition from early- to mid-seral stages. Decomposer subsystem dynamics were correlated with seral community dynamics. The effect of fumigation was minimized by initially planting with late-seral species. A conceptual model of secondary succession is presented based on N availability, relative growth rate, lifeform, and decomposition dynamics. |
| 出版年 | 1992 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 54 ENVIRONMENTAL SCIENCES ; RANGELANDS ; ECOLOGICAL SUCCESSION ; GRAMINEAE ; PLANT GROWTH ; SHRUBS ; LEGUMINOSAE ; PROGRESS REPORT ; NITROGEN CYCLE ; LAND RECLAMATION ; SOIL CHEMISTRY ; CANOPIES ; FERTILIZERS ; PHOSPHORUS 540210 ; BASIC STUDIES |
| URL | http://www.osti.gov/scitech/servlets/purl/10183928 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/264873 |
| 推荐引用方式 GB/T 7714 | Redente, E.F.,McLendon, T.. Nitrogen availability as a control mechanism of secondary succession within a semiarid shrubland ecosystem. Final report, October 1, 1990--June 27, 1992,1992. |
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