Long Term Ecological Research Program: Shortgrass Steppe

长期生态研究计划：短草草原

• 批准号: 9632852
• 负责人: Eugene Kelly
• 金额: $ 336万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-02-01 至 2003-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632852&HistoricalAwards=false
• 关键词: Long; Term; Ecological; Research; Program

9632852 Burke The shortgrass steppe (SGS) occupies the middle of the productivity gradient along which the LTER grassland sites lie. It is unique among North American grasslands for its long evolutionary history of intense selection by both drought and herbivory, leading to an ecosystem that is very well adapted to withstand grazing by domestic livestock. The distinctive features of the SGS are both its vegetation and the concentration of biological activity and organic matter belowground. The vegetation of the SGS is characterized by low-growing plants that are either tolerant or resistant to grazing and drought. The large concentration of biological activity belowground reflects the distribution of plant production and the enhanced rates of energy flow through heterotrophs belowground. It is also explained in part by the fact that most biologically active elements in grasslands are protected from natural disturbances by being stored in soil organic matter. The SGS LTER project has been in operation since 1982 and currently supports 46 long-term experiments, numerous short-term experiments, and has a large emphasis on integrative simulation analysis. SGS LTER work is divided into five major areas: populations and processes, biogeochemical dynamics, paleoecology and paleopedology, water and energy dynamics, and disturbances. In addition, the SGS is involved in many synthesis activities which will soon be summarized in a synthesis volume. One of the unique aspects of this research program is the emphasis on integrating knowledge about SGS ecosystems into simulation models. These models are used widely, and they will continue to serve as a mean of integrating ideas and developing hypotheses for future research in the SGS LTER program.

9632852 Burke Shortgrass Steppe（SGS）占据了lter草地所在的生产力梯度的中间。它在北美草原上是独一无二的，因为它的漫长的进化史上的干旱和草食性史无前例的进化史，导致了一个生态系统，它非常适合承受家庭牲畜的放牧。 SG的独特特征既是其植被和地下生物活性和有机物的浓度。 SGS的植被的特征是生长较低的植物，这些植物耐受性或抗性干旱。地下生物学活动的浓度大量反映了植物产量的分布以及通过地下异性营养的能量流的增强。这也部分通过以下事实来解释：大多数生物活性元素通过将其存储在土壤有机物中保护了自然障碍。 SGS lter项目自1982年以来一直在运行，目前支持46个长期实验，众多短期实验，并且非常强调综合仿真分析。 SGS lter工作分为五个主要领域：种群和过程，生物地球化学动力学，古生态学和古专科，水和能量动力学以及干扰。此外，SGS参与了许多合成活动，这些合成活动很快将在合成量中进行总结。该研究计划的独特方面之一是强调将有关SGS生态系统的知识整合到仿真模型中。这些模型被广泛使用，它们将继续充当整合思想并在SGS lter计划中为未来研究的假设提供假设的手段。