文章摘要
蒲 敏 1 ,孙玉川1,2,刘宁坤 2,刘九缠 2.岩溶区石漠化土壤 CO2 浓度和地表 CO2 通量研究[J].广东农业科学,2019,46(5):74-82
岩溶区石漠化土壤 CO2 浓度和地表 CO2 通量研究
Study on Soil CO2 Concentration and Surface CO2Flux in Karst Rocky Desertification Area
  
DOI:10.16768/j.issn.1004-874X.2019.05.011
中文关键词: 喀斯特  坡改梯  静态密闭箱 - 气相色谱法  土壤 CO2 浓度  释放通量
英文关键词: Karst  slope to terraced area  static sealed chamber-gas chromatography  soil carbon dioxide concentration  emission flux
基金项目:重庆市科委院士专项基金(cstc2018jcyj-yszx0013)
作者单位
蒲 敏 1 ,孙玉川1,2,刘宁坤 2,刘九缠 2 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. 中国地质科学院岩溶地质研究所 / 国土资源部广西岩溶动力学重点实验室广西 桂林 541004 
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中文摘要:
      【目的】探讨我国南方喀斯特石漠化地区 CO2 浓度分布和时空排放规律及岩区土壤有机碳含量、 土壤温度及土壤含水率等环境因子对 CO2 浓度及释放速率的影响。【方法】采用静态密闭箱 - 气相色谱法,对 2017 年 1~12 月重庆市南川石漠化治理示范区岩溶碳汇试验区坡改梯及对照区非坡改梯的土壤 CO2 浓度和地表 CO2 通量进行原位监测。【结果】非坡改梯地区土壤 CO2 浓度比坡改梯地区大,坡改梯和非坡改梯地区土壤 CO2 浓度大多数随着土壤深度增加呈下降趋势;非坡改梯地区地表 CO2 释放通量高于坡改梯地区;土壤 CO2 浓度及 释放通量均随季节有明显变化,在一定范围内土壤温度及土壤含水率都与地表 CO2 释放通量呈显著正相关关系, 在个别月份出现显著变化,表现为巨大的源与汇。【结论】土壤 CO2 浓度主要受土壤有机碳、土壤温度、土壤 含水率、土壤微生物及人为因素共同影响,地表 CO2 通量变化与植被覆盖、人类活动及土壤 CO2 浓度密切相关。
英文摘要:
      【Objective】 This paper aimed to investigate the distribution of CO2 concentration and its temporal and spatial emission laws in karst rocky desertification areas in southern China, and to explore the effects of environmental factors such as soil organic carbon content, soil temperature and soil water content on CO2 concentration and release rate in karst areas. 【Method】 The Static sealed chamber-gas chromatography method was used to monitor in situ the soil CO2 concentration and the surface CO2 flux in the terraced karst carbon sink experimental area and in the non-terraced karst carbon sink control area respectively in Nanchuan Rocky Desertification Control Demonstration Area in Chongqing from January to December of 2017. 【Result】 The soil CO2 concentration in the non-terraced area was higher than that in the terraced area, and the soil CO2 concentration in terraced area and non-terraced area decreased with the increase of soil depth; the surface CO2 emission flux in non-terraced area was higher than that in terraced area; both the soil CO2 concentration and the emission flux changed significantly with seasons. The soil temperature and soil water content showed significant positive correlations with the surface CO2 emission flux to some extent, and obvious changes occurred in some months, shown as huge sources and sinks. 【Conclusion】 Soil CO2 concentration is jointly affected by soil organic carbon, soil temperature, soil water content, soil microorganisms and human factors while the surface CO2 flux is closely related to vegetation coverage, human activities and soil CO2 concentration.
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