辽东山区天然次生林土壤呼吸研究

Soil respiration of natural secondary forests in mountainous areas in eastern Liaoning

利用Li-COR-8100测定并分析了辽东山区天然次生林生长季土壤呼吸特征、土壤呼吸年C释放量以及与土壤水热因子的相关关系。结果表明:天然次生林土壤呼吸速率日变化呈单峰曲线;土壤呼吸速率与地面10cm处土壤温度呈幂函数关系,关系式为y=0.3614e0.1219x(R2=0.702),土壤温度可以解释土壤呼吸变化的70.20%;该地区天然次生林土壤呼吸年均速率约1.14μmol/(m2.s),土壤向大气年释放C约为410.40～455.76 gC/m2。

In this paper,characteristics and annual C emission of soil respiration and its relationships with soil water and heat factors were measured and analyzed by Li-COR-8100 CO2 analyzer in natural secondary forests in mountainous areas of eastern Liaoning.The results indicated that： the diurnal variation of soil respiration rate in natural secondary forests showed a single peak,and the power function correlation was revealed between soil respiration rates and soil temperatures at 10cm form the surface,the equation was as follows： y=0.3614e0.1219x（R2=0.702）.70.2% of the variations in soil respiration could be explained by soil temperatuers.The annual aveage soil respiration rate was approximately 1.14μmol·m-2·s-1 in natural secondary forests in the areas,and the annual carbon emission to the atomosphere were between 410.40 ~ 455.76g C/m2.