寒温带兴安落叶松林火烧迹地地表CO_2通量研究  

Study on soil surface CO_2 flux in burned areas of Larix gmelinii forest in the cool temperate zone

作　　者：李攀[1] 周梅[1] 王忠林 魏江生[1] 赵鹏武[1] 温都如娜[1] 白巧云[1] 

机构地区：[1]内蒙古农业大学生态环境学院,内蒙古呼和浩特市010020 [2]内蒙古根河市根河林业局护林防火管理处,内蒙古根河市022350

出　　处：《生态环境学报》2012年第12期1950-1954,共5页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(30960317);内蒙古自治区科技创新引导奖励资金项目(20101914)

摘　　要：大兴安岭是我国惟一的寒温带针叶林区和高纬度多年冻土区,同时也是我国森林火灾的多发区。林火干扰作为森林生态系统稳定、可持续发展的关键影响因子,在全球气候变化的背景下显得尤为重要。2011年6—10月,在寒温带大兴安岭冻土林区未过火区、火灾后3年和8年的火烧迹地,我们利用静态箱-气相色谱法对火灾后不同年份(3a、8a)、不同程度(轻度、重度)火烧迹地土壤表面CO2通量(Rs)进行生长季原位观测,其结果表明:(1)火烧迹地Rs生长季变化呈单峰曲线(峰值出现在7月末),而未过火区Rs呈双峰曲线(峰值分别出现在7月末和8月末)(;2)3a和8a火烧迹地Rs变化值分别为1.12～3.92μmol/(m2.s)和1.10～4.23μmol/(m2.s),轻度和重度火烧迹地Rs变化值分别为1.07～4.13μmol/(m2.s)和1.15～4.02μmol/(m2.s),而未过火区Rs变化值为0.69～3.06μmol/(m2.s);(3)通过对不同年份、不同程度火烧迹地Rs比较,得出8a>3a>未过火区、轻度>重度>未过火区的CO2通量特点;(4)所有样地Rs和0～10 cm土壤温度(T10)具有极显著的指数回归关系(P<0.01),且8a火烧迹地和重度火烧迹地Rs对T10的敏感性分别高于3a火烧迹地和轻度火烧迹地;(5)对各样地Rs与0～10 cm土壤含水率(W10)的二次方程回归初步认为,W10不是影响该区Rs的主要因素。Great Xing＇an Mountain is China＇s only cold-temperate coniferous forest area and high latitude permafrost region that experiences frequent forest fires. Forest fire is the key factor affecting the stability of forest ecosystem and sustainable development under climate change. In 2011, the static chamber method was used to measure soil surface CO2 flux （Rs） during the growing season （June to October 2011） in 2 burned sites. The sites had experienced fire at different times （3a and 8a, respectively）. Within each site, measurements were taken in areas differing in fire intensity （lightly burned or severely burned）. One unburned control plot was also measured. Results： 1） Rs of bumed plots showed a unimodal curve with maximum Rs occurring at the end of July. The unburned plot shows a bimodal curve with maxima at the end of July and August, respectively. 2） The range of Rs was 1.10-4.23 μmol/（m2.s） at the 8a site and 1.12-3.92 μmol/（m2.s） at the 3a site. Rs ranged from 1.07-4.13 μmol/（m2·s） in light fire and 1.15-4.02 μmol/（m2.s） in severe fire areas, and from 0.69-3.06 μmol/（m2·s） in the unburned plot. 3） The order in measured Rs was as follows： 8a〉3a〉 unburned. Severe fire areas had higher Rs than unburned but lower Rs than light fire. 4） A significant index regression relationship was found between Rs and soil temperature at 0-10 cm（T10） （P〈0.05）. 5） Regression analysis of soil water content at 0-10cm depth （Wlo） suggested that W10 wasn＇t the main factor affecting Rs.

关 键 词：兴安落叶松 火烧迹地 土壤表面CO2通量 生长季 冻土 

分 类 号：S762.1[农业科学—森林保护学]