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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Ecohydrologic feedbacks controlling sizes of cypress wetlands in a patterned karst landscape
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Ecohydrologic feedbacks controlling sizes of cypress wetlands in a patterned karst landscape

机译：在图案化岩溶景观中控制柏树湿地尺寸的生态水解反馈

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摘要

Many landforms on Earth are profoundly influenced by biota. In particular, biota play a significant role in creating karst biogeomorphology, through biogenic CO2 accelerating calcite weathering. In this study, we explore the ecohydrologic feedback mechanisms that have created isolated depressional wetlands on exposed limestone bedrock in South Florida - Big Cypress National Preserve -as a case study for karst biogeomorphic processes giving rise to regularly patterned landscapes. Specifically, we are interested in: (1) whether cypress depressions on the landscape have reached (or will reach) equilibrium size; (2) if so, what feedback mechanisms stabilize the size of depressions; and (3) what distal interactions among depressions give rise to the even distribution of depressions in the landscape. We hypothesize three feedback mechanisms controlling the evolution of depressions and build a numerical model to evaluate the relative importance of each mechanism. We show that a soil cover feedback (i.e. a smaller fraction of CO2 reaches the bedrock surface for weathering as soil cover thickens) is the major feedback stabilizing depressions, followed by a biomass feedback (i.e. inhibited biomass growth with deepening standing water and extended inundation period as depressions expand in volume). Strong local positive feedback between the volume of depressions and rate of volume expansion and distal negative feedback between depressions competing for water likely lead to the regular patterning at the landscape scale. The individual depressions, however, are not yet in steady state but would be in 0.2-0.4 million years. This represents the first study to demonstrate the decoupling of landscape-scale self-organization and the self-organization of its constituent agents. (c) 2018 John Wiley & Sons, Ltd.
机译：地球上的许多地貌都受到生物群的深刻影响。特别是，Biota通过生物二氧化碳加速方解石风化在创造岩溶生物正明术中发挥着重要作用。在这项研究中，我们探讨了在佛罗里达州南部暴露的石灰石基岩上创造了孤立的抑郁湿地的生态水解反馈机制 - 大赛普拉斯国家保护区的喀斯特生物果断过程的案例研究，从而定期图案化景观。具体而言，我们感兴趣：（1）景观上是否达到了柏树抑郁（或将达到）平衡尺寸; （2）如果是的话，反馈机制稳定萧条的大小; （3）萧条之间的远端相互作用导致景观中萧条的均匀分布。我们假设三种反馈机制控制凹陷的演变并建立数值模型以评估每个机制的相对重要性。我们表明土壤覆盖反馈（即，由于土壤覆盖增厚，土壤覆盖反馈（即较小的CO 2到达耐候的基岩表面）是主要反馈稳定凹陷，其次是生物质反馈（即抑制生物质生长和加深的水平水和延伸的淹没期随着萧条的延伸势力）。抑郁症的抑郁和体积膨胀率之间的强大局部正反馈和持续持续水的持续反馈可能导致景观量表的常规图案化。然而，个人凹陷尚未稳定状态，但将在0.2-0.4万年。这代表了第一次展示景观级自组织和其组成代理人的自我组织的解耦的研究。 （c）2018 John Wiley＆Sons，Ltd。

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