Peng Wen-Jie, Li Qiang, Song Ang, Jin Zhen-Jiang
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Key Laboratory of Karst Dynamics, Ministry of Land and Resources & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China.
Huan Jing Ke Xue. 2018 Jun 8;39(6):2673-2679. doi: 10.13227/j.hjkx.201709119.
In recent years, the effect of greenhouse gas has been a focus. In order to reveal the spatial-temporal variations of CO and CH flux through a water-air interface, Wulixia reservoir was selected as a typical case for measuring COand CH flux using a floating chamber during four study periods in 2016.The primary productivity of the water was also studied. The results indicate that surface-layer water in Wulixia reservoir is a CO sink in summer, varying between -30.14 and -3.47 mg·(m·h). However, it is the source of CO in autumn and winter, varying between 15.57 mg·(m·h) and 115.06 mg·(m·h). The variation of methane flux is obvious in summer, but it is stable in autumn and winter. The spatial distribution of CO and CH show that they are higher in the typical bay area and lower in the tailing dam as well as in the drawdown zone of the reservoir. In addition, the spatial and temporal variation of CO and CH are negatively and positively correlated with primary productivity ( -0.477 and 0.771), respectively. Due to the high activity of photosynthetic micro- organisms in summer, CO can be sequestered, allowing the surface-layer water in Wulixia reservoir to be a CO sink. In addition, methanogenic bacteria can oxidize organic carbon produced by photosynthetic micro-organisms. Therefore, CH has a negative correlation with primary productivity. The results provide important information for the study of microorganism functions in karst water systems.
近年来，温室气体的影响一直是一个焦点。为了揭示通过水 - 气界面的CO和CH通量的时空变化，选取五里峡水库作为典型案例，于2016年的四个研究时段使用浮动箱测量CO和CH通量。同时还研究了水体的初级生产力。结果表明，五里峡水库表层水在夏季是CO汇，变化范围在-30.14至-3.47 mg·(m·h)之间。然而，在秋季和冬季它是CO源，变化范围在15.57 mg·(m·h)至115.06 mg·(m·h)之间。甲烷通量在夏季变化明显，但在秋季和冬季较为稳定。CO和CH的空间分布表明，它们在典型湾区较高，而在尾矿坝以及水库水位消落区较低。此外，CO和CH的时空变化分别与初级生产力呈负相关和正相关（-0.477和0.771）。由于夏季光合微生物活性高，CO可以被封存，使得五里峡水库表层水成为CO汇。此外，产甲烷细菌可以氧化光合微生物产生的有机碳。因此，CH与初级生产力呈负相关。这些结果为研究岩溶水系统中微生物功能提供了重要信息。
