| 广西弄拉表层岩溶动力系统水循环碳汇效应研究 |
| |
| 关键词:water cycle karst carbon sink epikarst dynamical system |
| 基金项目:广西自然科学基金(编号: 2013GXNSFBA019215)；国土资源部/广西岩溶动力学重点实验室开放基金(编号: 14-A-02-03)；中国地质调查局工作项目(编号: 12120113005100) |
|
| 摘要点击次数: 3368 |
| 全文下载次数: 3056 |
| 摘要: |
| The Carbon Sink during Karst Water Cycle in the Epikarst Dynamical System of Nongla, Guangxi |
| Based on years’ automatic monitoring of dynamic hydrological state of an epikarst spring in Nongla, Guangxi, the authors found that, under the good vegetation coverage, the discharge mode is different in different seasons. It is mainly the runoff discharge by spring in the wet season and consumption of ecological water requirement in the dry season. In 2012, the precipitation from April to August accounted for 66.24% of the whole year. At the same time, the discharge of spring accounted for 90.89% and the karst carbon sink accounted for 90.46% of the whole year. It is evident that the karst carbon sink occurs mainly in the wet season because of the higher runoff coefficient. In the study area, carbon sink is controlled by rainwater dilution, CO2 effect and water-rock interaction (WRI). At the beginning of precipitation, the concentration of HCO3- is continuously reduced, controlled by rain dilution. However, it is also obviously affected by CO2 effect and WRI. HCO3- concentration fluctuation with time. At the later stage of spring discharge, WRI is dominant again and HCO3- concentration tends to be somewhat stable. From the monitoring data obtained in the past decade, the concentrations of Ca2+, Mg2+ and HCO3- in the karst dynamic system were significantly increased with the recovery of the secondary forest vegetation. With the concentration of HCO3- as an example, the average value was 356.55 mg/L during the period of 2003—2005, whereas it was 432.97 m/L in 2012, the difference being 76.42 mg/L, and the value was increased by 21.4% during the ten years. |
| KANG Zhi-qiang,LIANG Li-ge,HE Shi-yi,LUO Yun-yi,YANG Zhi-qiang.2014.The Carbon Sink during Karst Water Cycle in the Epikarst Dynamical System of Nongla, Guangxi[J].Acta Geoscientica Sinica,35(4):481-486. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|