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| 喀斯特槽谷区土壤CO2浓度的短时变化及影响因素研究 |
| Short Term Concentration Change of CO2 in Soils of Karst Trough Valley Area and Its Influencing Factors |
| 投稿时间：2018-06-24 修订日期：2018-08-28 |
| DOI：10.14050/j.cnki.1672-9250.2019.47.007 |
| 中文关键词: 喀斯特槽谷区;土壤CO2浓度;强降雨;土壤温度;土壤湿度 |
| 英文关键词: karst trough valley area;soil CO2 concentration;heavy rainfall;soil temperature;soil moisture |
| 基金项目:国家重点研发计划（2016YFC050230205）；国家自然科学基金项目（41672160）。 |
| 作者 | 单位 | E-mail | | 游贤慧1,2, 杨琰1,2, 徐刚1,2, 邹晓岗1,2, 何志立1,2, 田宁1,2, 田洪明3, 曾朱周3 | 1. 西南大学 地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
2. 国土资源部岩溶生态环境-重庆南川野外基地, 重庆 408435
3. 重庆和信农业发展有限公司, 重庆 409800 | yy2954@gmail.com |
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| 中文摘要: |
| 龙潭喀斯特槽谷两侧顺、逆倾坡裸岩出露率、植被覆盖率存在较大差异，为探究龙潭槽谷两侧顺、逆倾坡土壤CO2浓度的短时变化及其影响因素，于2017年6月~2018年5月用固态CO2传感器法在槽谷两侧顺、逆倾坡土面上开展高分辨率土壤CO2浓度动态监测，并同时对监测点进行土壤温度、土壤湿度连续自动化监测。结果表明：（1）强降雨事件中，除强降雨初期（1h内），土壤CO2浓度出现短暂降低外，降雨事件整体上促进了土壤CO2浓度的上升；（2）昼夜尺度上，白天土壤CO2浓度大于夜晚，土壤CO2浓度对气温的响应速度较土温快；一年四季中，土壤CO2浓度波动幅度大小次序为夏季 > 秋季 > 春季 > 冬季；（3）在短时天气变化下，裸岩出露率越高、植被覆盖率越低，土壤CO2浓度与土温的相关性越强且在强降雨下的变化幅度越大。 |
| 英文摘要: |
| It had been reported that the rock exposure ratio and the vegetation coverage rate in the sloping and reversed slopes on both sides of the Longtan karst trough valley were different remarkably. This study conducted the dynamic high-resolution monitoring of CO2 concentration in soils on both sides of the Longtan karst trough valley, and monitored temperature and moisture of soils simultaneously using solid CO2 sensors during the period of from June 2017 to May 2018. The results showed that:(1) During heavy rainfalls, the overall soil CO2 concentration was promoted by rainfall events, except a short decrease in the early stage of rainfalls (within 1 hour). (2) The concentration of CO2 in soil was higher in the day than in the night, the concentration of CO2 in soil was more sensitive to the air temperature than the soil temperature did, and the daily fluctuation of CO2 concentration in soil followed an order of summer > autumn > spring > winter. (3) In terms of short-term weather conditions, the rock exposure and vegetation coverage rate have important influences on CO2 concentration of soil, the higher is the rock exposure rate, the higher is the fluctuation of CO2 concentrations in soil under heavy rainfalls, and the higher is the correlation of the CO2 concentrations in soil and the soil temperature. |
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