• 论文 •

### 中国主要流域盆地风化剥蚀率的控制因素

1. 1. 中国海洋大学化学化工学院, 山东 青岛 266003;
2. 青岛科技大学材料与环境科学学院, 山东 青岛 266042;
3. 华东师范大学河口海岸动力沉积和动力地貌综合国家重点实验室, 上海 200062
• 收稿日期:2002-05-25 修回日期:2002-09-25 出版日期:2003-07-20 发布日期:2003-07-20
• 基金资助:
国家重点基础研究发展规划项目"东黄海生态动力学与生物资源可持续利用(G1999043705)"、华东师范大学河口海岸动力沉积和动力地貌国家重点实验室资助项目(9907).

### Natural Controls of Fluvial Denudation Rates in Major Drainage Basins of China

LI Jing-Ying1,2, ZHANG Jing1,3

1. 1. Chemistry, Chemistry and Chemical Engineering College, Ocean University of China, Qingdao, Shandong 266003;
2. Materialand Environmental college, Qingdao University of Science and Technology, Qingdao, Shandong 266042;
3. State Key Laboratory of Estuary and Coast, East China Normal University, Shanghai 200062
• Received:2002-05-25 Revised:2002-09-25 Online:2003-07-20 Published:2003-07-20

Abstract: The chemical weathering and mechanical denudation play an important role in studying the sea-land matter balance and global climatic change. The rock weathering and erosion products, including the dissolved and solid yields which amount to 15Gt and 5Gt annually, are mainly transported through the rivers into the ocean. The dissolved and particulate loads of the river are used to estimate the physical erosion and chemical weathering rates over the world drainage basins, respectively. The total weathering rate is obviously higher than that of major world watersheds. It is found that the lower erosion rates are distributed in the northern and southern China, while the higher values are observed in the middle of China. The average physical denudationrate rate in Huangfuchuan (the Yellow River's tributary) is the highest value known in the world. The chemical weathering rate is always far less than the mechanical denudation rate in the same watershed, furthermore, the proportion of total denudation contributed by chemical weathering decreases as total denudation rate increases. Data demonstrates chemical weathering rate constitutes only a small proportion of the total denudation rate, while mechanical denudation rate is the most important denudation rate in most drainage basins in China. Moreover the chemical weathering rate is to a less extent controlled by the mechanical denudation rate in the same drainage basin.The environmental and basin property data are quantified and indicated by the annual mean precipitation and temperature, runoff, aridity index, relief ratio, highest altitude, vegetative ratio, river length and basin area in the past decades. Variables expressing basin relief characteristics and aridity indexes are found to be most strongly associated with mechanical and total denudation rates, with approximately 72% of the variance in the total denudation rates being accounted for by the basin relief ratios and aridity indexes. The annual mean precipitation and temperature are responsible for the 39% of the variance of the chemical weathering rates in the Chinese drainage basins. However, basin property, runoff, highest altitude and vegetative ratio are only weakly associated with the physical denudation and chemical weathering rates. The effect of vegetative ratio on increasing the chemical weathering rates and decreasing the physical denudation rates possibly shows clear on the small scale and usually faint on the large scale. The key factors identified as controlling denudation rates here are also applicable to the interaction between tectonic and denudation processes in the Chinese watersheds, although chemical weathering rates are more weakly associated with these topographic variables than mechanical denudation rates. In particular, compared to the world other watersheds, the aridity indexes play a major role in controlling the denudation rates of Chinese drainage basins.

• P343.