LTER: Biome-level Constraints on Population, Community, and Ecosystem Responses to Climate Fluctuation, Sevilleta LTER II

DEB9411976塞维莱塔长期生态研究计划(LTER)旨在解决一系列关于气候动态和新墨西哥州中部生物群过渡带生物反应的生态学假说。塞维莱塔山脉横跨西南部的几个主要生物群，包括大盆地、大平原和奇瓦瓦沙漠，位于中等海拔的莫高隆针叶林植物群的中心。研究区域的其他生态系统包括里奥格兰德河岸杨树林、中海拔黄松林、中海拔黄松林和高海拔针叶/杨树混交林。该地区受到厄尔尼诺南方涛动(ENSO)的强烈影响，降水量在半十年尺度上有较大的波动。Sevilleta LTER的主要主题涉及在不同组织级别(例如，生物、种群、社区、生态系统和景观)以及在多个空间和时间尺度上对生态反应的综合理解。组织这项研究的目的是：(1)该地区水在驱动主要生态系统过程中的作用，(2)碳的命运，因为它受同化、分解和再分配过程的控制，(3)调节碳加工程度和分布的土地利用做法，(4)生物多样性的组装、分配和维持，以及(5)气候条件变化的直接和间接后果。水平衡数学模型将提供长距离辐射研究核心主题和参与调查人员所研究的不同层次组织的统一综合。水平衡方法将利用从头六年开始的持续研究，并将为为数不多的新研究提供概念和数量背景，这些研究提供对塞维莱塔的更丰富和更完整的特征。此外，LTER科学家将在地理环境中实施世纪级的系统模型，其中水平衡将由非平衡水模型驱动。因此，这些模型将提供关于有机物加工、初级生产和无机投入等核心领域的现有和未来数据的综合。这项合成将立即用于干扰和种群核心主题，包括植被-环境关系、营养动态、物种分布和丰度、动物种群研究和种群遗传学。这些实地和实验室研究将提供必要的生物成分，代表对水动态的反应和制约的偶然性和反馈。

DEB9411976 MILNE The Sevilleta Long-Term Ecological Research Program (LTER) is designed to address a suite of ecological hypotheses concerning climate dynamics and the responses of organisms in a biome transition zone in central New Mexico. The Sevilleta straddles several major biomes of the Southwest, including the Great Basin, Great Plains, and Chihuahuan Desert, and is at the epicenter of the mid-elevation Mogollon Conifer Woodland Flora. Additional ecosystems in the study region include Rio Grande riparian cottonwood forests, mid-elevation ponderosa pine forests, mid-elevation ponderosa pine forests, and higher-elevation mixed-conifer / aspen forests. The region is strongly influences by the El Nino Southern Oscillation (ENSO), with major fluctuations in precipitation on semi-decadal times scales. The major theme of the Sevilleta LTER relates to the synthetic understanding of ecological responses at various levels of organization (e.g., organismal, population, community, ecosystem, and landscape) and at multiple spatial and temporal scales. The research is organized to address (1) the role of water in the region in driving major ecosystem processes, (2) the fate of carbon as it is controlled by processes of assimilation, decomposition, and redistribution, (3) land use practices which regulate the extent and distribution of carbon processing, (4) the assembly, distribution and maintenance of biodiversity, and (5) the direct and indirect consequences of changing climatic conditions. Mathematical water balance models will provide a unifying synthesis of the LTER core topics and the various levels of organization studied by the participating investigators. The water balance approach will take advantage of continued studies from the first six years and will provide a conceptual and quantitative context for a modest number of new studies that provide a richer and more complete characterization of the Sevilleta. In addition, LTER scientists will implement a systems model of the CENTURY class in a geographical context, in which the water balance will be driven by the nonequilibrium water model. Thus, the models will provide a synthesis of existing and future data concerning the core areas of organic matter processing, primary production, and inorganic inputs. The synthesis will be of immediate use in relation to the disturbance and population core topics, including vegetation-environment relations, nutrient dynamics, species distributions and abundances, animal population studies, and population genetics. These field and laboratory studies will provide the necessary biological components that represent the contingencies and feedbacks that are both the responses to, and the constraints on, the dynamics of water.