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Qin X.,Chinese Academy of Geological Sciences | Qin X.,Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification | Jiang Z.,Chinese Academy of Geological Sciences | Jiang Z.,Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification | And 3 more authors.
Geological Bulletin of China | Year: 2015

The chemical and strontium isotopic analytical results of water samples collected four times one year from the eleven stations of the Pearl River showed that, with the rock chemical weathering of either carbonate rocks or silicate rocks, HCO3 -, Ca2+ and Mg2+ become the main ionic compositions of the river. The river ion stoichiometric and flux calculation shows that the carbonate rock weathering rate and atmospheric CO2 consumption are 27.60 mm/ka and 540.21×103 mol/(km2·a-1) respectively, which are 10.8 and 6.7 times the silicate rock weathering rate and atmospheric CO2 consumption respectively, so the carbonate rocks are the main rocks of the chemical weathering and atmospheric CO2 sink in the basin. With the favorable climatic conditions and high carbonate rock ratio of the basin, the mean rock weathering rate and atmospheric CO2 consumption in the Pearl River Basin can reach 30.15 mm/ka and 620.36×103 mol/(km2·a-1) respectively. The atmospheric CO2 consumption value is about 2.6 times the average value of the 60 rivers in the world. ©, 2015, Science Press. All right reserved. Source


Jiang Z.-C.,Chinese Academy of Geological Sciences | Jiang Z.-C.,Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification | Luo W.-Q.,Chinese Academy of Geological Sciences | Luo W.-Q.,Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification | And 10 more authors.
Acta Geoscientica Sinica | Year: 2014

A karst ecological research team from the Institute of Karst Geology, Chinese Academy of Geological Sciences in Guilin has been going in for the creative study of the leakage of water and soil in the karst mountain areas of Southwest China since the beginning of the 21th century. A series of progresses in the study of leakage of water and soil were achieved in 2013. The concept, processes and mathematic model of the leakage of water and soil were expounded. By using the site monitoring and advanced isotopic techniques, the team firstly and systemically revealed the quantitative differences and causes of the leakage of water and soil in different geomorphologic positions and different ecological environments of the karst peak cluster depression, built the grade classification standards and the regression model of the soil erosion in the karst areas, created some new water and soil preservation models which combined the biological methods with the engineering and technological rules, and formed the pitaya ecological production industry with good ecological and economic benefits in the karst rocky desertification environment. All these research results can provide technological support and demonstration examples for the treatment of the rocky desertification and the conservation of water and soil in the karst areas of Southwest China. Source


Luo W.-Q.,Chinese Academy of Geological Sciences | Luo W.-Q.,Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification | Zhang H.-X.,Chinese Academy of Geological Sciences | Jiang Z.-C.,Chinese Academy of Geological Sciences | And 5 more authors.
Acta Geoscientica Sinica | Year: 2014

In the special karst ground water system, there exist different processes and features of water and soil loss in karst mountains. Especilly in karst peak cluster depression, much more water and soil are lost from the leakage of karst fissures than from the surface flow. Some monitoring stations of water and soil loss were built in Guohua karst ecological experimental site, Pingguo County, Guangxi, with the purpose of investigating the difference between the surface soil erosion and the soil leakage in different environments of the karst peak-cluster depression. The monitoring results reveal the most remarkable differences in different geomorphologic positions. From peak, paddle, hill slope, hill foot to the bottom of depression, the mean annual soil leakage loss moduli are 49.09 t/(km2·a), 212.06 t/(km2·a), 727.71 t/(km2·a), 1104.03 t/(km2·a) and 909.11 t/(km2·a) respectively, which possess 92.43%, 96.24%, 78.57%, 70.88% and 38.68% of the total mean soil loss moduli in the points respectively. There are five kinds of main land uses in the karst peak-cluster depression, i.e., slope farmland, young secondary forest, kuding tea garden, grass land, and brush and grass land. In the slope farmland, thare is not only the biggest soil erosion modulus but also a annual increase tendancy. The soil erosion modulus has an annual decrease tendancy in the other four lands, and the lowest value is in the grass land. Therefore, the prevention of soil erosion should be based on different measures in different geomorphologic positons of the peak cluster depression. In the peak, the water source forest should be mainly developed. In the hill slope, the attention should be paid to the eco-prodution and the decrease of the soil leakage. And in the depression, the water drainage system should be the key engineering. With the harnessing of rocky desertification and the rehabilitation of the ecology in Guohua karst ecological experimental site, the mean water and soil loss modulus of the karst peak cluster depression decreased by about 65% from 2003 to 2010. Source

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