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Comparative Responses of Moist and Dry Arctic Tundra to Altered Snow and Temperature Regimes

潮湿和干燥的北极苔原对雪和温度变化的比较响应

基本信息

批准号：
9400083
负责人：
Marilyn Walker
金额：
$ 61.3万
依托单位：
University of Colorado at Boulder
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1994
资助国家：
美国
起止时间：
1994-07-15 至 1999-08-19
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9400083&HistoricalAwards=false
关键词：
Comparative Responses Moist Dry Arctic

项目摘要

9400083 Walker This project will evaluate the ecological consequences of climate change in moist and dry arctic tundra with field manipulations of winter precipitation and summer temperature. Project scientists will investigate effects on species performance, community structure, and ecosystem C and N dynamics. They will erect snow fences to increase snowpack and use small greenhouses to warm air and soil temperatures. Growth rings and annual stem increments of woody species and physiological plant performance will be compared with historical temperature and precipitation records. Experimental findings will also be compared to natural vegetation patterns along snow gradients and areas where long-term anthropogenic increases in snow cover have occurred. Simulation modeling will be used to extend their findings with a focus on net ecosystem carbon budgets. The main effort will be to quantify and understand the magnitude and direction of the transient response of arctic tundra to a series of climate change scenarios. The experimental infrastructure will permit more detailed investigations by other investigators in future years if the response is, as we anticipate, of sufficient magnitude to be of importance for evaluating effects of climate change to arctic ecosystems. The project is a U.S. contribution to the International Tundra Experiment (ITEX). ***

9400083步行者本项目将通过对冬季降水和夏季温度的实地操作，评估气候变化在潮湿和干燥的北极苔原的生态后果。项目科学家将调查对物种表现、群落结构和生态系统C和N动态的影响。他们将竖起防雪栅栏来增加积雪，并使用小温室来温暖空气和土壤温度。将木本植物的生长轮和年茎生长量以及植物的生理表现与历史温度和降水记录进行比较。实验结果也将比较自然植被模式沿着雪梯度和地区的长期人为增加积雪发生。模拟建模将用于扩展他们的研究结果，重点是净生态系统碳预算。主要的努力将是量化和理解北极苔原对一系列气候变化情景的瞬时响应的幅度和方向。实验基础设施将允许其他研究人员在未来几年进行更详细的调查，如果响应，正如我们所预期的那样，足够大的重要性，以评估气候变化对北极生态系统的影响。该项目是美国对国际苔原实验（ITEX）的贡献。 ***