| 土壤CO2浓度变化特征及其对岩溶碳循环的影响 |
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| 引用本文： | 黄淑卿,赵瑞一,张乾柱,何世季,何迁,黄薇巍,刘畅.土壤CO2浓度变化特征及其对岩溶碳循环的影响[J].环境科学研究,2022,35(10):2322-2329. |
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| 作者姓名： | 黄淑卿 赵瑞一 张乾柱 何世季 何迁 黄薇巍 刘畅 |
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| 作者单位： | 1.重庆交通大学，重庆 400074 |
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| 基金项目： | 国家重点研发计划项目(No.2018YFD1100104)；岩溶环境重庆市重点实验室开放课题(No.Cqk202101)；山东省地下水环境保护与修复工程技术研究中心(筹)开放基金项目(No.801KF-2021-10) |
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| 摘 要： | 为探究土壤CO2浓度变化特征及其对岩溶碳循环的影响，于2018年6—12月对重庆市南川区后沟泉水化学及泉域上覆土壤CO2(监测点土地利用类型为玉米-油菜轮作地)进行为期7个月的连续监测和采样，并结合1—5月的监测数据，定量分析旱雨季土壤CO2浓度与岩溶碳汇量的季节性演变特征及二者的相互关联性. 结果表明:①土壤CO2浓度具有显著的季节性变化特征，主要表现为雨季较高、旱季较低，其最高值和最低值分别出现在9月(13 316 μmol/mol)和1月(2 262.63 μmol/mol). ②温度与土壤CO2浓度之间存在较强的正相关关系(R2=0.82，0.0012浓度之间不具相关性(R2=0.17，P>0.5)，说明土壤CO2浓度主要受温度的影响. ③泉水Ca2++Mg2+、HCO3?浓度在雨季明显高于旱季，而水体CO2净消耗量在旱雨季无较大差异，这可能是由于受土壤CO2效应、降水稀释效应和H2SO4/HNO3释放CO2的共同影响. 研究显示，土壤CO2浓度的变化特征表现为季节性差异，但在土壤CO2浓度及外部环境的多重影响下，岩溶碳循环的季节性变化并不明显.
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| 关 键 词： | 土壤CO2 CO2净消耗量 岩溶泉 碳循环 |
| 收稿时间： | 2022-05-25 |
Characteristics of Soil CO2 Concentration Change and Its Influence on Karst Carbon Cycle |
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| Affiliation: | 1.Chongqing Jiaotong University, Chongqing 400074, China2.Chongqing Branch, Changjiang River Scientific Research Institute, Chongqing 400026, China |
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| Abstract: | To study the characteristics of soil CO2 concentration change and its influence on the karst carbon cycle, the spring chemistry, and CO2 of the overlying soil in the spring area of Hougou, Nanchuan District, Chongqing (the land use type of the monitoring site is maize-oilseed rape rotation) were monitored and sampled for seven months. The seasonal evolution characteristics of soil CO2 concentration and the karst carbon sink during the dry and rainy seasons and their correlations were quantitatively analyzed. The results showed that: (1) Soil CO2 concentration had obvious seasonal variation characteristics, which was mainly higher in the rainy season and lower in the dry season. The highest and lowest values appeared in September (13,316 μmol/mol) and January (2,262.63 μmol/mol), respectively. (2) There was a strong positive correlation between temperature and soil CO2 concentration (R2=0.82, 0.0012 concentration (R2=0.17, P>0.5), which indicated that soil CO2 concentration was mainly influenced by temperature. (3) The concentrations of Ca2++Mg2+ and HCO3? in the rainy season were significantly higher than those in the dry season, while the net CO2 consumption in water bodies was significantly different between the dry and rainy seasons. This may be due to combined effects of soil CO2, precipitation dilution, and CO2 released by H2SO4/HNO3. The study showed that the variation of soil CO2 concentration was characterized by seasonal differences, but the seasonal variation of the karst carbon cycle was not obvious under the multiple effects of soil CO2 concentration and external environmental influences. |
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