【作者】 刘继鹏；

【导师】 周尚哲；

【作者基本信息】 华南师范大学 ， 自然地理学， 2007， 硕士

【摘要】 南岭在史地学者中久负盛名，南岭沿称五岭，查证古文献记载表明“五岭”概念较早出现在《淮南子》、《史记》中，“南岭”概念也许较早出现在唐代以来一些游学文人的作品中。南岭地质复杂，山势散乱，影响南北之水文、气候、土壤植被及人文地物等，是我国南方一条重要的自然地理界线。南岭剥蚀速率的研究，对于诠释南岭地貌演化及中国南方环境演变具有重要的意义。本文以南岭南坡为研究对象，运用东江流域、北江流域和桂江(包括贺江)流域实测的泥沙及水化学资料去反演流域内部发生的主要侵蚀过程，推算一定时段内的区域侵蚀速率并探讨了现代侵蚀速率的空间和时间分布规律，并着重探讨了气候与剥蚀之间的变化关系，得出如下结论：潮湿热带地区岩石的风化速率一般为0.025-0.050mm／a。湿热的南岭南坡总体平均机械剥蚀速率为0.063 mm／a，其中中段(0.065 mm／a)略高于东段(0.059mm／a)和西段(0.063 mm／a)，流域上游大于下游；总体的平均溶蚀速率为0.037mm／a，从东向西溶蚀速率递增，其数值分别为0.021mm／a、0.039mm／a和0.049mm／a，溶蚀比重在全国(1～75％)和世界大河(1.64～98.76％)中处于中等位置；研究区总体剥蚀速率为0.100mm／a，与全国(0.090～1.426mm／a)和世界其他地区(0.020～1.400mm／a)相比，其数值是较低的。更多还原

【Abstract】 The Nanling Mountains, also named Wuling, has long been well known among historians and geographers in China. The denomination of Wuling, which means five mountains in Chinese (in fact it is made up of five mountains: the Dayu mountain, the Qitian mountain, the Mengzhu mountain, the Dupang mountain and the Yuecheng mountain), appeared as early as in China’s two great ancient works Huainanzi(179～122 B.C.) and Shichi (145～90 B.C.), whereas the denomination of Nanling might first appeared in some literatures of the geographers in the Tang dynasty (618～907A.D). Being an important latitudinal structural system in South China which is mostly made up of NNE strike mountains, its geologic settings complicated and mountains separated, the Nanling Mountains has a great impact on the the hydrology, climate, soil, vegetation and social customs of its both sides. Thus it makes an important geographic boundary in South China and the study on the dedundation rate for the Nanling Mountains is of great significance on the geomorphic evolution.This paper focuses on the denudation rates for the southern slope of the Naling Mountains(110°-116°E, 23°26′-26°20′N) in the past 50 years. Based on the hydrological and sedimentary data on the suspended and dissolved loads from the eastern part (the Dongjiang River valley), the middle part (the Beijiang River valley) and the western part (the Guijiang River and the Hejiang River valleys), we deduced the main erosion process within the river valleys, worked out the regional denudation rate in the past 50 years, and analysed the temporal-spatial variation and distribution of modern denudation rate for the southern slope of the Naling Mountains. Emphases were laid on the correlation between the climate and denudation. Conclusions were drawn as follows: Generally, the weathering rate in the warm-humid tropical zone is 0.025-0.050mm/a. The average of the overall mechanical denudation rates for the southern slope of the Naling Mountains is 0.063 mm/a, among which the mechanical denudation rate of the middle part (0.065 mm/a) is a little higher than those of the estern part (0.059 mm/a) and the western part (0.063 mm/a) and the mechanical denudation rate of the upper reaches is higher than that of the lower reaches; the dissolved rate is 0.021mm/a, 0.039mm/a and 0.049mm/a from the eastern part to the western part respectively with an average of 0.037mm/a., and the ratio of chemical denudation to total denudation is moderate compared with those of China (1～75％) and the world (1.64～98.76％); the average of the overall dedunation rates for the study area is 0.100mm/a and that is lower copared with those of China (0.090～1.426mm/a) and the world (0.020～1.400mm/a).更多还原