SGS-LTER Effects of grazing on ecosystem structure and function (GZTX): Bite Counts on the Central Plains Experimental Range, Nunn, Colorado, USA 1993-2008, ARS Study Number 32

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.
When the CPER was established in 1939, researchers constructed a .5-1 ha grazing exclosure in each of the pastures. These areas have remained protected from grazing for the past 70 years. The remaining areas have been grazed for the past 20+ years. This collection of pastures and exclosures provided an extraordinary opportunity to reinitiate grazing and protection, and evaluate the balance between degradation and aggradation. We proposed to rearrange fences and expose areas to grazing that have been protected for 50 years, and protect areas from grazing that had been grazed for 50 years. The combinations of grazing conditions were: 1. Long-term protection 2. Long-term grazing (moderate) 3. 50 years of protection followed by grazing 4. 50 years of grazing followed by protection Net primary production, nitrogen dynamics, cattle utilization, and community dynamics of vegetation were measured. Additional information and referenced materials can be found: http://hdl.handle.net/10217/85596. 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=528 Webpage with information and links to data files for download

本数据集由科罗拉多州立大学管理的短期草地长期生态系统研究（SGS-LTER）项目的研究人员制作。包含SGS-LTER项目的长期数据集和背景信息（提案、报告、照片等）的综合性项目收藏于科罗拉多州数字收藏馆（http://digitool.library.colostate.edu/R/?func=collections&collection_id=3429）。由生态元数据语言生成的数据表及其相关元数据文档可能可通过服务于生态研究社区的其它存档库获取，并代表SGS-LTER项目收藏库的组成部分。自1939年建立CPER以来，研究人员在每个牧场上建设了0.5-1公顷的放牧隔离区。这些区域在过去70年里一直免于放牧。剩余区域在过去20多年里一直被放牧。这些牧草地和隔离区的集合为重新启动放牧和保护，并评估退化和积累之间的平衡提供了非凡的机会。我们提出了重新排列围栏，并使过去50年未被放牧的区域暴露于放牧之下，以及保护过去50年被放牧的区域。放牧条件的组合包括：1. 长期保护 2. 长期放牧（适度）3. 50年保护后放牧 4. 50年放牧后保护。净初级生产、氮循环、牛的利用率和植被群落动态均被测量。更多信息和参考资料可在以下链接找到：http://hdl.handle.net/10217/85596。本数据集包含的资源：资源标题：指向html文件的网站指针。文件名：网页，url：https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-sgs&identifier=528 包含信息和数据文件的下载链接的网页。