SGS-LTER Effects of water and nitrogen additions on carbon and nitrogen in shortgrass ecosystems on the Central Plains Experimental Range, Nunn, Colorado, USA 1997-2011, ARS Study Number 143

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. The objective of this research is to evaluate the long-term response of shortgrass ecosystems to additional water and nitrogen inputs. An experiment was conducted during the IBP project (1970-1975) in which water and nitrogen were applied (Lauenroth et al. 1978, Dodd and Lauenroth 1979, Milchunas and Lauenroth 1995). While we gained an enormous increment in our knowledge about shortgrass ecosystems from this experiment it raised as many questions as it answered. One of the problems was that the treatments were very high levels of nitrogen (100-150kg/ha N) and water (600 mm/growing season) additions. Additional information and referenced materials can be found: http://hdl.handle.net/10217/85629.本数据包由开展短草草原长期生态研究（Shortgrass Steppe Long Term Ecological Research, SGS-LTER）项目的研究人员编制，该项目由科罗拉多州立大学主管。SGS-LTER项目的长期数据集及背景资料（包括研究方案、报告、影像资料等）均收录于科罗拉多州数字馆藏（Digital Collections of Colorado）的综合性项目馆藏中，访问链接为http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429。本数据集包含的数据表与配套元数据文档采用生态元数据语言（Ecological Metadata Language）编写，可通过服务于生态研究社区的其他学术仓储获取，且属于SGS-LTER大型项目馆藏的组成部分。本研究旨在评估短草草原生态系统对额外水分与氮素输入的长期响应。研究团队于国际生物学计划（International Biological Program, IBP）实施期间（1970-1975年）开展了相关实验，向样地施加氮素与水分（相关研究成果参见Lauenroth等1978年、Dodd与Lauenroth 1979年、Milchunas与Lauenroth 1995年）。尽管该实验极大地丰富了我们对短草草原生态系统的认知，但同时也催生了诸多亟待解答的新问题。其中一项局限在于，实验所施加的氮素（100-150kg/ha N）与水分（600mm/生长季）添加量均处于较高水平。更多相关信息与参考资料可通过以下链接获取：http://hdl.handle.net/10217/85629。