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| 1 | Chemical weathering and chemical runoffs in the seashore granite hills in South China显示文摘Surface runoffs and the contents of major ions and dissolved silicon were surveyed and analyzed based on weekly sampling for one year in a granite watershed of Zhuhai City, Guangdong Province. The results demonstrated that the slope runoff played an essential role in feeding the rivulet during precipitation, whereas the groundwater was more important for the rivulet in the non-raining stages. Dissolved silicon, Na+, HCO3-, and Clions constituted the major chemical components of the rivulet water. Atmospheric CO2 and H2SO4 sourced from the oxidation of pyrite were the main erosive mediums in the natural chemical weathering. Natural chemical weathering, the wet and dry deposition of sea-salt, and acids precipitation contributed approximately equal shares of anions to the rivulet water. The ratio of NO3- to SO42- was more than 1.0 in the runoff of the studied seashore watershed, whereas it is less than 1.0 in the Xijiang River that is adjacent to the study area. This implied that the chemical composition of runoff is controlled mainly by the differences in atmospheric acid precipitation caused by human activities and lithology within the catchments under the same bio-climate zone. The CO2 flux consumed by the rock chemical weathering processes within the seashore granite watershed in South China was (0.35-1.37)×105 mol km-2 a-1. | GAO QuanZhou & TAO Zhen School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China | 2010 | Science China Earth Sciences2010，53，8： | 16 |
| 2 | Estimation of carbon sinks in chemical weathering in a humid subtropical mountainous basin显示文摘The fluvial geochemistry of the mainstream and tributaries of the Zengjiang River was investigated,and the mass balance approach and deduction methods were used to estimate the uptake of atmospheric CO2 through rock chemical weathering.The results showed that the chemical runoff mainly consisted of HCO3-,Ca2+,Na+,and dissolved Si,and that silicate mineral weathering was significant,but carbonate mineral weathering was a minor source of dissolved loads in the Zengjiang River basin because of the low amount of interlayered carbonate rock strata in the catchment.The ion composition indicated that atmospheric CO2 was the primary erosive agent for rock chemical weathering in the Zengjiang River basin.The CO2 consumption fluxes caused by rock chemical weathering were(3.50-3.81) × 105 mol km-2 a-1,which is just lower than that in tropical and subtropical basalt and carbonate regions,and is much higher than that in temperate and cold-temperate regions,indicating that surficial chemical weathering processes in the humid and hot monsoon current influencing the low-middle latitude zone of the Northern Hemisphere constitutes a significant carbon sink in the global biogeochemical cycle. | TAO Zhen GAO QuanZhou WANG ZhenGang ZHANG ShengHua XIE ChenJi LIN PeiSong RUAN XiaoBing LI ShuHong MAO HaiRuo | 2011 | Chinese Science Bulletin2011，56，35： | 15 |
| 3 | Stable isotopic composition of riverine dissolved inorganic carbon of the Xijiang River Inner Estuary显示文摘为研究河流的溶解的无机的碳(DIC ) 的稳定的同位素的作文的时间空间的变化,我们在整个水疗院逻辑年执行了调查在期间它 δ
13 C 波浪交流的 DIC | JIAO Shulin TAO Zhen GAO Quanzhou LIU Kun SHE Jianwei DING Jian LIU Zufa | 2008 | Journal of Geographical Sciences2008，18，3： | 8 |
| 4 | ^(14)C measurement of forest soils in Dinghushan Biosphere Reserve显示文摘Organic carbon in forest soils of Qingyunsi and Wukesong profiles can be divided into fast and slow components. Δ14C values of these profiles decrease with increasing of depth. The Δ14C values in 30—40 cm depth interval of Wukesong profile are decreasing sharply until a very low value,showing that a strong geological environment change occurred about 1 560 years ago. The 14C apparent ages of Wukesong profile show that the coniferous and broad-leaf mixed forests around Wukesong profile have been developing since 425 a BP, which is consistent with historical documents. The penetrating depths of 'bomb 14C' in Qingyunsi and Wukesong profiles are 10 and 20 cm, respectively. | SHEN Chengde , LIU Dongsheng (LIU Tungsheng) , PENG Shaolin, SUN Yanmin , JIANG Mantao , Yl Weixi , XING Changping , GAO Quanzhou , LI Zhi’an and ZHOU Guoyi Guangzhou Institute of Geochemisry, Chinese Academy of Sciences, Guangzhou 510640, China Institute of Geology, Chinese Academy of Sciences , Beijing 100029, China South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China | 1999 | Chinese Science Bulletin1999，44，3： | 7 |
| 5 | Temporal and Spatial Variability of Dissolved Organic Carbon Concentration in the Xijiang River, South China显示文摘A whole year analysis of riverine dissolved organic carbon (DOC) concentrations in the Xijiang River (XJR), South China, showed that the mean riverine DOC concentration (1.24 mg L-1) in the XJR was notably lower than the averaged value (5.75 mg L-1) of the global riverine DOC concentration in several major rivers. There is an inconspicuous monthly fluctuation of the DOC signal in the XJR, but on a semi-yearly time scale, however, the riverine DOC concentration had significant difference between hydrological seasons. The DOC level during the flood season (1.18 mg L-1) was less than that during the non-flood season (1.40 mg L-1). Owing to the concomitance of the flushing and dilution effects of the runoff during the high-water period, the variation of riverine DOC concentration with discharge in the XJR differed from that reported in many other major rivers. The DOC export flux above the city of Wuzhou was about 0.62× 106 g C km-2 yr-1. The DOC transported during the '056' Massive Flood period comprised 30.35% of the annual total, while the discharge accounted for 36.32% of the total annual flow. The characteristics in riverine DOC concentration in the XJR were attributed to the combined effect of the geomorphologic, monsoon climatic and hydrological processes as well as land-use within the drainage basin. | TAO Zhen GAO Quanzhou GUO Wenping WANG Zhengang ZHANG Yongling XIE Chenji HUANG Xiakun ZHONG Hongwei | 2011 | Journal of Mountain Science2011，8，5： | 3 |
| 6 | Dynamics of CO 2 partial pressure and CO 2 outgassing in the lower reaches of the Xijiang River, a subtropical monsoon river in China显示文摘 | Guanrong Yao Quanzhou Gao Zhengang Wang Xiakun Huang Tong He Yongling Zhang Shulin Jiao Jian Ding | 2007 | Science of the Total Environment2007，，1： | 1 |
| 7 | Riverine organic carbon in the Xijiang River ( South China) : seasonal variation in content and flux budget 显示文摘 | GAO Quanzhou TAO Zhen SHEN Chengde | 2002 | Environmental Geology2002，41，7： | 1 |
| 8 | Effects of hydrological processes on the chemical composition of riverine suspended sediment in the Zhujiang River, China 显示文摘 | GAO Quanzhou TAO Zhen XIE Meiqi | 2003 | Hydrological Processes2003，17，： | 1 |
| 9 | Elemental and isotopic signatures of particulate organic carbon in the Zengjiang River, southern China 显示文摘 | GAO Quanzhou TAO Zhen YAO Guanrong | 2007 | Hydrological Processes2007，21，10： | 1 |
| 10 | Dynamics of CO2 partial pressure and CO2 outgassing in the lower reaches of the Xijiang River, a subtropical monsoon river in China 显示文摘 | YAO Guanrong GAO Quanzhou WANG Zhengang | 2007 | Science of the Total Environment2007，376，： | 1 |
| 11 | Chemical weathering and CO2 consumption in the Xijiang River basin显示文摘 | Gao Quanzhou | 2009 | South China Geomorphology2009，106，： | 1 |
| 12 | Effects of hydrological processes on the chemical composition of riverine suspended sediment in the Zhujiang River,China显示文摘 | Quanzhou Gao Zhen Tao Meiqi Xie | 2003 | Hydrological Processes2003，17，12： | 1 |
| 13 | Cost-Effective Machining of Granite by Reducing Tribological Interactions显示文摘In order to implement cost-effective machining of gr anite materials with diamond impregnated tools, we should realize low tool w ear, low energy consumption, and high cutting efficiency, while the accuracy of the workpiece surfaces are maintained to be satisfactory. It is understood that the main factors affecting the tool wear, the energy, and the efficiency during the machining process are related to the tribological interactions that occur at the interface between the diamond tool surface and the workpiece. Based on this consideration, we propose a new machining method to machine granite materia ls to achieve improved cost effectiveness. In the proposed method, the tribologi cal interactions are maintained to a minimum. Based on the analyses of the experimental results, the following conclusions can be drawn: The wear performance is greatly dependent on the machining parameters and their combination. Therefore, optimum machining parameters must be set up at first in order to optimize the tribological characteristics of segments and thereby sawbl ade performance. These may be realized by balancing the energy expended by frict ion and the mechanical load on diamond crystal. The geometry and structure of diamond segments are another important criterion f or the diamond saw blade. Using a seven-layer structure for multi-blades sawin g and applying segments with side slots for trimming application had greatly red uced the frictions in the sawing processes. The wetting and bonding between diamonds and matrix alloys have been considered as the prerequisite for high wear performance of the segments. Diamonds coated w ith Ti-Cr alloy by a unique technique can effectively improve its wetting c apability and provide more storage space for debris, thereby reducing friction i nteractions. | LI Yuan 1, HUANG Hui 1, SHEN Jian-yun 1, XU Xi-peng 1, GAO Yong-sheng 2 (1. Province Key Lab of Stone Machining, Huaqiao University, Quanzhou 362011, China 2. Department of Mechanical Engineering, Hong Kong University of Science and T echnology, Hong Kong, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 1 |
| 14 | Chemical weathering and C02 consumption in the Xijiang River basin, South China 显示文摘 | QUANZHOU GAO Z T X H | 2009 | Geomorphology2009，106，34： | 1 |
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