CAJ | 학술논문

随着大气CO2浓度的升高,主要由其引起的温室效应与对生物新陈代谢的影响变得越来越显著.森林生态系统在全球碳循环中扮演着重要的角色.为了评估和理解森林土壤CO2通量及其随空气和土壤温度的季节和昼夜变化规律,我们在长白山北坡典型阔叶红松林内利用静态箱技术进行了原位观测.实验在整个生长季(6月初至9月末)昼夜进行,利用气相色谱进行气体分析.结果表明: 长白山阔叶红松林土壤是大气二氧化碳源,其CO2通量具有明显的季节和昼夜变化规律.通量的变化范围是(0.30-2.42)μmol·m-2·s-1,平均值为0.98μmol·m-2·s-1.土壤CO2排放的季节规律表明,土壤CO2通量的变化与气温和土壤温度的变化有关.CO2平均通量的最大值出现在7月((1.27±23%)μmol·m-2·s-1),最小值出现在9月((0.5±28%)μmol·m-2·s-1).土壤CO2的昼夜波动与土壤温度变化有关,而在时间上滞后于温度的变化.森林下垫面土壤CO2通量与土壤温度显著相关,与6cm深度土层温度相关系数最大.基于气温和土壤温度计算的Q10值范围为2.09-3.40.图2表3参37.
수착대기CO2농도적승고,주요유기인기적온실효응여대생물신진대사적영향변득월래월현저.삼림생태계통재전구탄순배중분연착중요적각색.위료평고화리해삼림토양CO2통량급기수공기화토양온도적계절화주야변화규률,아문재장백산북파전형활협홍송림내이용정태상기술진행료원위관측.실험재정개생장계(6월초지9월말)주야진행,이용기상색보진행기체분석.결과표명: 장백산활협홍송림토양시대기이양화탄원,기CO2통량구유명현적계절화주야변화규률.통량적변화범위시(0.30-2.42)μmol·m-2·s-1,평균치위0.98μmol·m-2·s-1.토양CO2배방적계절규률표명,토양CO2통량적변화여기온화토양온도적변화유관.CO2평균통량적최대치출현재7월((1.27±23%)μmol·m-2·s-1),최소치출현재9월((0.5±28%)μmol·m-2·s-1).토양CO2적주야파동여토양온도변화유관,이재시간상체후우온도적변화.삼림하점면토양CO2통량여토양온도현저상관,여6cm심도토층온도상관계수최대.기우기온화토양온도계산적Q10치범위위2.09-3.40.도2표3삼37.
The forest ecosystem plays an important role in the global carbon cycling. A study was conducted to evaluate soil CO2 flux and its seasonal and diurnal variation with the air and soil temperatures by using static closed chamber technique in a typical broad-leaved/Korean pine mixed forest area on the northern slope of Changbai Mountain, Jilin Province, China. The experiment was carried out through the day and night in the growing season (from June to September) in situ and sample gas was analyzed by a gas chromatograph. Results showed that the forest floor was a large net source of carbon, and soil CO2 fluxes had an obvious law of seasonal and diel variation. The soil CO2 flux of broad-leaved/Korean pine mixed forest was in the range of 0.30-2.42 (mol·m-2·s-1 with the mean value of 0.98 (mol·m-2·s-1. An examination on the seasonal pattern of soil CO2 emission suggested that the variability in soil CO2 flux could be correlated with variations in soil temperature, and the maximum of mean CO2 flux occurred in July ((1.27±23%) (mol·m-2·s-1) and the minimum was in September ((0.50±28%) (mol·m-2·s-1). The fluctuations in diel soil CO2 flux were also correlated with changes in soil temperature; however, there existed a factor for a time lag. Soil CO2 flux from the forest floor was strongly related to soil temperature and had the highest correlation with temperature at 6-cm depth of soil. Q10 values based on air temperature and soil temperature of different soil depths were at the ranges of 2.09–3.40.