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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Long-term biogenic soil mixing and transport in a hilly, loess-mantled landscape: Blue Mountains of southeastern Washington.
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Long-term biogenic soil mixing and transport in a hilly, loess-mantled landscape: Blue Mountains of southeastern Washington.

机译：在丘陵，黄土覆盖的景观中长期生物源性土壤的混合和运输：华盛顿东南部的蓝山。

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In soil-mantled landscapes, downslope sediment transport occurs via disturbance-driven processes that vary with climate and vegetation change. To help constrain the long-term (10 yr) pattern and rate of soil mixing and transport in forests, we analyzed the distribution of tephra grains in soil along a hillslope transect in the Blue Mountains, SE Washington. Deposited within a loess mantle, tephra associated with Mt. Mazama (7.7 cal. kyr B.P.) serves as a marker bed for estimating erosion and transport rates. Moving downslope, the buried tephra horizon is progressively exhumed and becomes increasingly mixed in the upper soil layer, reflecting disturbance and transport via tree root growth and turnover. This pattern also implies increasing erosion rates downslope and our hillslope transect becomes increasingly convex coincident with progressive exhumation of the tephra layer. This systematic correspondence between topographic form, specifically, local convexity, and surface lowering is consistent with theoretical models for which soil transport rates depend on slope inclination. From our analysis, calibrated coefficients for a linear, slope-dependent transport model are on the order of 10-3 m2yr-1, consistent with previous work in forested loess-mantled landscapes. In addition, our results reveal both the high degree of soil mixing over millennial timescales and the local variability of mixing in forested landscapes. Furthermore, the results enable us to quantify the amount of energy expended by trees in mixing and transporting soil and the net sediment transport fraction of the net primary productivity NPP of the ecosystem.
机译：在土壤覆盖的景观中，下坡沉积物的运输通过扰动驱动的过程发生，该过程随气候和植被的变化而变化。为了帮助限制森林中土壤的长期混合模式（> 10年）和运输速率，我们分析了华盛顿州蓝山山坡样地上的地弗拉粒在土壤中的分布。沉积在与黄山相关的黄土幔中。 Mazama（公元前7.7千克朗）是估算侵蚀和运输速率的标志床。移动到下坡，渐渐发掘出埋藏的特非拉层位，并在上层土壤层中越来越多地混合在一起，从而反映了通过树根生长和周转产生的干扰和运输。这种模式还意味着下坡的侵蚀速率不断增加，而我们的山坡样地变得越来越凸，与渐渐发掘的特弗拉层一起。地形形式，特别是局部凸度和表面下降之间的这种系统对应关系，与土壤运移速率取决于坡度的理论模型是一致的。根据我们的分析，线性的，与坡度有关的运输模型的校准系数约为10 -3 m 2 yr -1 ，与先前在森林黄土覆盖的景观中所做的工作一致。此外，我们的研究结果揭示了千年纪时期土壤的高度混合以及森林景观中混合的局部变化。此外，结果使我们能够量化树木在混合和运输土壤中消耗的能量数量以及生态系统净初级生产力NPP的净沉积物运输分数。

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