喀斯特石漠化治理区土壤CH4和CO2排放研究  

Study on Soil CH4 and CO2 Emissions from Karst Rocky Desertification Control Area

作　　者：蒲敏 孙玉川 刘九缠[2] PU Min;SUN Yuchuan;LIU Jiucan(Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwestern University, Chongqing 400715 , China;Key Laboratory of Karst Dynamics, Ministry of Land and Resources & Guangxi Institute of Karst geology, Chinese Academy of Geological Sciences, Guilin 541004, China)

机构地区：[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

出　　处：《地球与环境》2019年第3期291-300,共10页Earth and Environment

基　　金：岩溶槽谷石漠化治理固碳增汇试验示范(DD20603050)

摘　　要：本研究采用静态密闭箱-气相色谱法,于2016年12月到2017年11月对重庆市南川石漠化治理示范区4个岩溶碳汇试验区(金银花地JYH、人工造林地杨树林YSL、坡改梯PGT、经济作物花椒林地HJ)及3个对照区(荒地HD、非坡改梯FPGT、弃耕地QGD)的土壤甲烷、二氧化碳的浓度及排放通量进行原位观测,探讨我国南方喀斯特石漠化地区甲烷和二氧化碳浓度分布和时空排放规律,及岩溶区土壤温度、土壤含水率等环境因子对甲烷、二氧化碳排放的影响。结果表明:不同植被类型下土壤CO2的浓度范围为5 003.64~19 163.23 mg/m^3,土壤CH4的浓度范围为5.35~7.46 mg/m^3。土壤CO2的排放通量具有随季节变化土壤CO2排放通量随季节明显变化,在一定范围内土壤温度及土壤含水率都与CO2排放通量呈显著正相关关系。土壤CH4释放速率没有明显的季节变化规律,在个别月份出现显著变化表现为巨大的源与汇,主要是受到土壤温度、土壤含水率及土壤微生物的共同影响。本研究采用静态密闭箱-气相色谱法,于2016年12月到2017年11月对重庆市南川石漠化治理示范区4个岩溶碳汇试验区(金银花地JYH、人工造林地杨树林YSL、坡改梯PGT、经济作物花椒林地HJ)及3个对照区(荒地HD、非坡改梯FPGT、弃耕地QGD)的土壤甲烷、二氧化碳的浓度及排放通量进行原位观测,探讨我国南方喀斯特石漠化地区甲烷和二氧化碳浓度分布和时空排放规律,及岩溶区土壤温度、土壤含水率等环境因子对甲烷、二氧化碳排放的影响。结果表明:不同植被类型下土壤CO2的浓度范围为5 003.64~19 163.23 mg/m^3,土壤CH4的浓度范围为5.35~7.46 mg/m^3。土壤CO2的排放通量具有随季节变化土壤CO2排放通量随季节明显变化,在一定范围内土壤温度及土壤含水率都与CO2排放通量呈显著正相关关系。土壤CH4释放速率没有明显的季节变化规律,在个别月份出现显著变化�In this study, the soil methane and carbon dioxide concentration and release flux in 4 karst carbon sink test areas (YH, YSL, PGT, HJ) and 3 controlled areas (HD, FPGT, QGD) were observed from December 2016 to November 2017 in the demonstration area of Chongqing Nanchuan desertification control. The distribution of methane and carbon dioxide in the rocky desertification area of Karst in southern China and its temporal and spatial emission rules, and the effects of environmental factors such as soil temperature and soil water content on methane and carbon dioxide emissions in karst areas are discussed. The results showed that under different vegetation types the soil CO2 concentration range was 5 003.64~19 163.23 mg/m^3, and the soil CH4 concentration range was 5.35~7.46 mg/m^3. Soil CO2 emission fluxes changed significantly with seasons. In a certain range, soil temperature and soil moisture content were positively correlated with CO2 emission fluxes. There was no obvious seasonal variation in soil CH4 release rate, and significant changes in individual months showed a huge source and sink, mainly affected by soil temperature, moisture content and soil microorganisms.

关 键 词：喀斯特 土壤CO2 土壤CH4 浓度 排放通量 

分 类 号：S153[农业科学—土壤学]