全球气候变暖对黄土高原侵蚀产沙的影响

EFFECT OF GLOBAL CLIMATIC WARMING ON THE EROSION AND SEDIMENT YIELD ON THE LOESS PLATEAU

本文讨论未来全球气候变暖引起黄土高原侵蚀产沙的变化趋势。在分析气候期与侵蚀期关系的基础上,提出堆积期与侵蚀期都发生在干旱期,未来全球气候变暖进入湿润期,黄土高原侵蚀产沙趋于减少。

For the recent years, the erosion and sediment yield on the Loess Plateau tend to decrease obviously, as a result of the periodical reduction in precipitatior. Starting from the condition of global climatic warming in the future, this paper discusses the tendency of variation in the erosion and sediment yield on the Loess Plateau, Based on the correlation between the variations in erosion and climate in history, it has been identified that both the strong erosion and the deposition occurred during dry periods Because of the oncoming global climatic warming, the Loess Plateau will go into a wetter period, with an increasing precipitation. Consequently, the cover of vegetation will increase, leading to a reduction in erosion and sediment yield.ue to a limited environmental capacity and an over-laden population, the erosion and sediment yield will still remain at the present level