SGS-LTER CO2 Elevation Study: Gas exchange of the major species measured at chamber CO2 concentrations in Open Top Chambers on the Central Plains Experimental Range, Nunn, Colorado, USA 1997 - 2001

This data package was produced by researchers working on the Shortgrass Steppe Long Term Ecological Research (SGS-LTER) Project, administered at Colorado State University. Long-term datasets and background information (proposals, reports, photographs, etc.) on the SGS-LTER project are contained in a comprehensive project collection within the Digital Collections of Colorado (http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429). The data table and associated metadata document, which is generated in Ecological Metadata Language, may be available through other repositories serving the ecological research community and represent components of the larger SGS-LTER project collection. Additional information and referenced materials can be found: http://hdl.handle.net/10217/82454.
Single leaf gas exchange (CO2 & H2O) was measured several times per season on important grass species in the shortgrass steppe open-top-chamber experiment, to investigate physiological adaptations to elevated CO2. C3 grass displayed photosynthetic acclimation, while C4 grass did not. Leaf water-use-efficiency was improved under ECO2. Absolute assimilation rates were more dependent on soil and plant water status than on CO2. This research was conducted at the Central Plains Experimental Range, near Nunn, CO; lat.40degrees 40 minutes N; long. 104 degrees 45 minutes W in the shortgrass steppe region of NE Colorado, USA and as a collaboration between SGS-LTER and USDA-ARS researchers. Resources in this dataset:Resource Title: Website Pointer to html file. File Name: Web Page, url: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-sgs&identifier=157 Webpage with information and links to data files for download

此数据集由致力于科罗拉多州立大学管理的短草草原长期生态系统研究（SGS-LTER）项目的学者所制作。关于SGS-LTER项目的长期数据集及背景资料（包括提案、报告、照片等）均收录在科罗拉多州数字收藏馆的全面项目集合中（http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429）。数据表及其关联的元数据文档，以生态元数据语言生成，可能通过服务于生态研究领域的其他存储库获得，并代表SGS-LTER项目集合的组成部分。更详细的信息及相关资料可查阅：http://hdl.handle.net/10217/82454。在短草草原开放顶棚实验中，对重要草种的单叶气体交换（CO2与H2O）进行了多次测量，以研究其对高浓度CO2的生理适应性。C3类草表现出光合作用的适应，而C4类草则未表现出适应性。在ECO2条件下，叶片水分利用效率得到提升。绝对同化速率更多地依赖于土壤和植物的水分状况，而非CO2。该研究在位于美国科罗拉多州东北部Nunn附近的中央平原实验站进行，地理坐标为北纬40度40分，西经104度45分，并作为SGS-LTER与美国农业部ARS研究者的合作项目。本数据集中的资源包括：资源标题：指向HTML文件的网站指针，文件名：网页，网址：https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-sgs&identifier=157，包含信息及下载数据文件的链接。