Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 9527833 |
| Consequences of Drought for Populations of Cryptantha flava | |
| Brenda Casper | |
| 主持机构 | University of Pennsylvania |
| 开始日期 | 1996-08-01 |
| 结束日期 | 2001-07-31 |
| 资助经费 | 349903(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 | ECOLOGICAL & EVOLUTIONARY PHYS |
| 语种 | 英语 |
| 国家 | 美国 |
| 英文简介 | 9527833 Casper Under models that predict long-term changes in global climate, semi-desert regions are expected to become even drier. The purpose of this study is to predict how natural populations of plants in these regions will respond to drought conditions. Most ecological studies of water use in plants have focused on anatomical or physiological adaptations that allow particular species to occupy dry habitats. There has been little effort to determine how populations and communities will respond to temporal changes in water availability. To do this, we need to understand how drought affects individuals depending on their size, developmental stage, or associations with other plants. The investigators will experimentally reduce the amount of rainfall received by natural populations of the semi-desert herbaceous perennial Cryptantha flava by erecting temporary shelters during spring rainstorms. The study is based on data collected during a natural drought year indicating that larger plants are more severely affected by drought than smaller plants. Comparisions will be made of survival, growth and flowering of individuals of different sizes and in different microhabitats, under shrubs or in the open, both in areas where water has been reduced and in areas receiving natural rainfall. These demographic data will be supplemented by measurements of water use, leaf nitrogen content, and photosynthesis. These sorts of measurements will help to determine why individuals respond to changes in water availability as they do. The experimental reduction in water will be repeated spatially and in two different years. Demographic and physiological measurements will be taken on the same individuals in the year before drought, the drought year, and the year afterwards. This replication of the experiment is important because natural variation in rainfall is likely to occur during the experiment. The study should also lead to identification of lingering effects that extend beyond the drought year itself. |
| 来源学科分类 | Biological Sciences |
| URL | https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527833 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/341106 |
| 推荐引用方式 GB/T 7714 | Brenda Casper.Consequences of Drought for Populations of Cryptantha flava.1996. |
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