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首页> 外文期刊>Natural Hazards and Earth System Sciences Discussions >Dendrogeomorphically derived slope response to decadal and centennial scale climate variability: Black Mesa, Arizona, USA
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Dendrogeomorphically derived slope response to decadal and centennial scale climate variability: Black Mesa, Arizona, USA

机译：DendrogeoMorphy源自Decadal和Centennial Climate Varimative的坡度响应：黑色Mesa，亚利桑那州，美国

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A major impediment to an understanding of the links between climate and landscape change, has been the relatively coarse resolution of landscape response measures (rates of weathering, sediment production, erosion and transport) relative to the higher resolution of the climatic signal (precipitation and temperature on hourly to annual time scales). A combination of high temporal and spatial resolution dendroclimatic and dendrogeomorphic approaches were used to study relationships between climatic variability and hillslope and valley floor dynamics in a small drainage basin in the Colorado Plateau of northeastern Arizona, USA Dendrogeomorphic and vegetation evidence from slopes and valley bottoms, including root exposure, bending of trunks, change in plant cover and burial and exhumation of valley bottom trees and shrubs, suggest that the currently observed process of root colonization and rapid breakdown of the weakly cemented bedrock by subaerial weathering, related to periodic dry/wet cycle induced changes in vegetation cover, has lead to a discontinuous, climate-controlled production of sediment from these slopes. High-amplitude precipitation shifts over the last 2000-years may exert the largest control on landscape processes and may be as, or more, important than other hypothesized causal mechanisms (e.g. ENSO frequency and intensity, flood frequency) in eroding slopes and producing sediments that ultimately impact higher order drainages in the region. Current vegetation response to a prolonged drought over the past decade suggests that another major transition, incorporating vegetation change, slope erosion, sediment production and subsequent valley floor deposition, may be in its initial phase.
机译：了解气候和景观变化之间联系的主要障碍，一直是相对粗糙的横向响应措施（风化，沉积物，腐蚀和运输）相对于气候信号的较高分辨率（降水和温度）每小时到年度尺度）。高时和空间分辨率的树突和树状动态方法的组合用于研究亚利桑那州东北部的小型排水盆中的气候变异和山坡与山谷地板动态的关系，来自斜坡和山谷底部的植被和植被证据，包括根曝光，树干弯曲，植物覆盖的变化和谷底叶和灌木的埋葬和挖掘，表明目前观察到的根殖民化过程和弱胶泥基岩的快速分解通过皮下风化，与周期性干/湿有关循环诱导植被覆盖的变化，导致来自这些斜坡的沉积物的不连续，气候控制的生产。过去2000年的高幅度降水变化可能会对景观过程的最大控制产生最大的控制，并且可能比其他假设的因果机制（例如ENSO频率和强度，泛频）在侵蚀斜坡和产生沉积物的情况下最终影响该地区的高阶排水。目前过去十年延长干旱的目前植被反应表明，另一种主要过渡，纳入植被变化，坡侵蚀，沉积物生产和随后的谷地板沉积，可能处于其初始阶段。

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