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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A probabilistic, biologically informed model of desert shrub population dynamics with the granularity appropriate for geomorphic simulations
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A probabilistic, biologically informed model of desert shrub population dynamics with the granularity appropriate for geomorphic simulations

机译：概率，生物上知情模型的沙漠灌木种群动态模型，粒度适合地映像

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摘要

Across arid landscapes, desert shrubs affect where and how sediment is transported by various physical processes such as overland flow, wind, and rain splash. Simplistic biological models such as logistic growth curves offer important first steps towards representing and linking life to landscape dynamics. More sophisticated descriptions of desert shrub dynamics on scales commensurate with downslope sediment transport, however, are essential for more rigorously understanding how complex shrub-sediment interactions may be affecting hillslope geomorphology. Here we present such a model that features a strong biophysical foundation by including, for example, basic aspects of desert soil-water hydrology and population ecology such as recruitment, growth, and mortality. Model input parameters can also be modified to account for the influence of different environmental conditions and stressors (e.g. precipitation, soil types, droughts, grazing, fires, and climate change). Model behaviors mimic well documented aspects of how desert shrub populations respond to changes in precipitation, for example, productivity decreases with increasingly arid conditions and density declines during prolonged periods of drought. Model output (position and size of shrubs occupying a hillslope in a given year) represents the basic biological input variables necessary for calculating, for example, how rain-splash induced mound building by individual shrubs may be affecting downslope sediment fluxes. Future research aimed at coupling this biological model with existing sediment transport models can therefore help advance our understanding for how desert shrub populations affect hillslope erosion across a broad range of scenarios. (c) 2018 John Wiley & Sons, Ltd.
机译：在干旱的景观中，沙漠灌木影响了沉积物的地点以及如何通过陆上流动，风和雨飞溅等各种物理过程运输。简单的生物模型，如物流生长曲线，提供重要的第一步，迈向景观动态的景观和联系起来。然而，在与下坡沉积物运输相称的鳞片上的沙漠灌木动态的更复杂描述对于更严格地了解复杂的灌木沉积物相互作用可能影响山坡地貌，这是必不可少的。在这里，我们提出了这种模型，其通过包括例如沙漠土壤水水文和人口生态学的基本方面，包括强烈的生物物理基础，例如招生，生长和死亡率。还可以修改模型输入参数以考虑不同环境条件和压力源的影响（例如降水，土壤类型，干旱，放牧，火灾和气候变化）。模型行为模仿荒漠灌木群体如何应对降水变化的良好文献方面，例如，随着越来越多的干旱期间的干旱期间的干旱条件和密度下降，生产率降低。模型输出（在给定年内占用山坡的灌木的位置和尺寸）代表了计算例如雨飞溅诱导的单个灌木的土墩建筑所需的基本生物输入变量可能会影响下坡沉积物势率。因此，旨在耦合这种具有现有沉积物运输模型的生物模型的未来研究可以帮助我们对荒漠灌木群体如何影响山坡侵蚀在广泛的情景中的理解。 （c）2018 John Wiley＆Sons，Ltd。

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