中文摘要：

在到 2006 的从 1950 年代的三个 hydrologic 车站的沉积流动上的数据被利用在从珍珠河送到海洋的推迟的沉积负担学习十、年度、每月的变化。结果证明包括西方河，北方河和东方河，在来自三条主要支流的沉积流动的变化是空间地不一致的。因为将近 90% 推迟的沉积负担来自西方河，它的变化在全部珀尔河里统治了沉积流动的全面趋势。尽管一个重要减少趋势在全部的沉积流动的年度变化存在，十的变化能被划分成一个增加的阶段和一个减少的阶段，与在在 1980 年代末的二个阶段之间的转弯的点。从 1950 年代到 1980 年代，平均的年度河沉积流动增加了 30.43% 。然而，自从 1990 年代，沉积流动显著地减少了，与是的平均沉积流动在 2000 年代的 38.60% 更少比那在 1950 年代。当前的沉积流动也是 52.93% 不到它在 1980 年代的山峰。到海的推迟的沉积负担运输的每月的变化模式更有趣。为西方河，所有月显示出一个减少的趋势，并且为大多数月，减小价值是重要的。然而，为东方河，沉积负担在湿季节在旱季和一个增加趋势显示出一个减少趋势。回归分析的方法被用来在沉积流动上在变化学习降水的影响。气候变化不是在在推迟的沉积负担的变化后面的主要驱动力，这被发现。在 1990 年代前，集中的陆地使用破坏了上面的珀尔河的脆弱的生态系统，并且加快了岩石 desertification 的过程。因而，加重了侵蚀在推迟的沉积负担引起了增加的土壤。然而，在水库以内的沉积保留开始了在 1990 以后在大水坝的巨大的构造以后起一个主导的作用，并且在送到海洋的推迟的沉积负担导致减少。

英文摘要：

Data on sediment flux at three hydrologic stations from the 1950S to 2006 are utilized to study the decadal, annual, and monthly variations in suspended sediment load delivered from the Pearl River to the ocean. Results show that variations in sediment flux from three main tributaries, including the West River, the North River and the East River, are spatially non-uniform. Since nearly 90% of the suspended sediment load comes from the West River, its variation has dominated the overall tendency of sediment flux in the entire Pearl River. Although a significant decreasing trend exists in the annual variation of the total sediment flux, the decadal change can be divided into an increasing phase and a decreasing phase, with the turning point between the two phases in the late 1980s. From the 1950s to the 1980s, the average annual river sediment flux increased by 30.43%. However, sediment flux has decreased significantly since the 1990s, with the average sediment flux being 38.60% less in the 2000s than that in the 1950s. The current sediment flux is also 52.93% less than its peak in the 1980s. The monthly variation pattern of the suspended sediment load transport to the sea is more interesting. For the West River, all months show a decreasing trend, and for most months the reduction values are significant. However, for the East River the sediment load shows a decrease trend in the dry season and an increase trend in the wet season. The method of regression analysis was used to study the influence of precipitation in the variation on the sediment flux. It was found that the climate change is not the main driving force behind the variation in suspended sediment load. Before the 1990s, intensive land use destroyed the vulnerable ecosystem of the upper Pearl River, and speeded up the process of rocky desertification. Consequently, aggravated soil erosion caused an increase in suspended sediment load. However, sediment retention within reservoirs had begun to play a dominant role after the massive construction of large d