骆马湖中华绒螯蟹养殖区与非养殖区水-气界面CO2通量日变化特征的比较

Comparison of daily variation characteristics of CO2 fluxes at the water-gas interface between aquaculture and non-aquaculture areas of Eriocheir sinensis in Luoma Lake

摘要:

为比较湖面中华绒螯蟹（Eriocheir sinensis）养殖区与非养殖区水-气界面CO₂通量之间的差异以及影响CO₂通量的因素，选择于2023年8月4日至8月5日使用PS-9000便携式碳通量自动测量系统在骆马湖中华绒螯蟹养殖区与非养殖区水-气界面进行CO₂通量测定，同时对气象因子及水质指标进行同步测定。结果显示，养殖区CO₂通量平均值为0.012 μmol/（m²·s），表现为CO₂的排放源，非养殖区CO₂通量平均值为-0.006 μmol/（m²·s），表现为CO₂的吸收汇，但养殖区和非养殖区均表现出白天为CO₂的排放源，夜晚为CO₂的吸收汇。通过多元逐步回归分析可知，影响养殖区和非养殖区CO₂通量的主要环境因子有所区别，前者的影响因子主要为气温和pH，后者的影响因子主要为总磷、硝态氮和总有机碳。研究结果揭示了中华绒螯蟹湖面养殖区与非养殖区水-气界面CO₂通量特征及影响因素，为深入了解湖区不同水产养殖功能区CO₂通量特征提供参考。

Abstract:

In order to compare the differences between the CO₂ fluxes at the water-air interface between the aquaculture areas and the non-aquaculture areas of Eriocheir sinensis on the lake surface and the factors affecting the CO₂ fluxes. The experiment was carried out at Luoma Lake from August 4 to August 5， 2023， where CO₂ fluxes were measured at the water-air interface between the aquaculture areas and the non-aquaculture areas of Eriocheir sinensis of the lake by using the PS-9000 Portable Automatic Measurement System of Carbon Fluxes and the synchronized measurement of the meteorological factors and water quality indices were analyzed at the same time. The results showed that the average value of CO₂ fluxes in the aquaculture area was 0.012 μmol/（m²·s）， which showed an overall CO₂ emission source， and the CO₂ fluxes in the non-aquaculture area was -0.006 μmol/（m²·s）， which showed an overall CO₂ sink. However， both aquaculture and non-aquaculture areas exhibit CO₂ as a source during the day and a sink at night. Multiple stepwise regression analyses showed that the main environmental factors affecting CO₂ fluxes differed between aquaculture and non-aquaculture areas， with air temperature and pH being the the former and total phosphorus， nitrate nitrogen and total organic carbon being the the latter. The results of the study revealed the characteristics and influencing factors of CO₂ fluxes at the water-gas interface between aquaculture and non-aquaculture areas of Eriocheir sinensis in lake， which provides data support for an in-depth understanding of the CO₂ fluxes characteristics of different aquaculture functional areas of freshwater lakes.