SGER: Unusual Biologic Activity on Desert Pavement Surfaces in Response to Recent El Nino Event, Mojave Desert, California

SGER：沙漠路面上异常的生物活动以应对最近的厄尔尼诺事件，加利福尼亚州莫哈韦沙漠

• 批准号: 9814276
• 负责人: Peter Haff
• 金额: $ 0.5万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814276&HistoricalAwards=false
• 关键词: SGER; Unusual; Biologic; Activity; Desert

9814276HaffDesert pavement surfaces in the Mojave Desert region that were observed over a period of several decades to have been essentially free of annual plant growth were observed this spring to have been invaded by dense growths of annual vegetation. It is inferred that this unusual increase in pavement biomass was due to the abnormally wet weather associated with the recent El Nino event. This proposal requests support for an immediate field visit to affected pavement sites to document vegetation patterns and densities before the vegetation fades with increasing seasonal temperatures, and to assess any changes that may have been caused either directly or indirectly (via foraging animals) to the otherwise stable pavement surfaces. A follow up field trip is planned for this coming fall. The results of this field study will be used to determine whether surface clast patterns on otherwise stable desert pavement surfaces contain information about past variations of environmental variables such as local precipitation.

9814276Haff 莫哈韦沙漠地区的沙漠路面在几十年的时间里观察到基本上没有一年生植物生长，但今年春天却发现被茂密的一年生植被侵入。 据推测，路面生物量的异常增加是由于最近厄尔尼诺事件导致的异常潮湿天气造成的。 该提案要求支持立即对受影响的路面地点进行实地考察，以记录植被随季节温度升高而消失之前的植被模式和密度，并评估可能直接或间接（通过觅食动物）对其他稳定的路面造成的任何变化。 计划于今年秋季进行后续实地考察。 这项实地研究的结果将用于确定稳定的沙漠路面上的表面碎屑图案是否包含有关环境变量（例如当地降水）过去变化的信息。