Trimble SW
Department of Geography and Institute of the Environment, University of California, 1255 Bunche Hall, Los Angeles, CA 90095-1524, USA.
Science. 1999 Aug 20;285(5431):1244-6. doi: 10.1126/science.285.5431.1244.
The total measured rate of alluvial sediment accretion in the agricultural Coon Creek Basin for the period 1975-93 was only about 6 percent of the rate that occurred in the 1930s, but the distributed changes within the basin were highly variable and systematic. Sediment yield (efflux), however, remained relatively constant despite large stream and valley changes within the basin. These observations demonstrate (i) that sediment sources, sinks, and fluxes vary widely over time and space and (ii) that, although improved soil conservation measures have decreased soil erosion, the downstream effects are complex.
1975年至1993年期间，农业区库恩溪流域冲积沉积物的总测量堆积速率仅约为20世纪30年代速率的6%，但流域内的分布变化高度可变且具有系统性。然而，尽管流域内溪流和山谷发生了巨大变化，沉积物产量（外流）仍保持相对稳定。这些观察结果表明：（i）沉积物来源、汇和通量在时间和空间上变化很大；（ii）尽管改良的土壤保护措施减少了土壤侵蚀，但其下游影响是复杂的。
